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  • Articles  (62)
  • high pressure  (62)
  • Springer  (62)
  • American Physical Society
  • 1985-1989  (62)
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  • Physics  (62)
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  • Articles  (62)
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  • Springer  (62)
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  • 1
    Electronic Resource
    Electronic Resource
    Phase behavior of the system He-N2 at high pressures (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 15-25 
    Details
    ISSN: 1572-9567
    Keywords: binary mixtures ; diamond anvil cell ; helium ; high pressure ; nitrogen ; phase equilibria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent investigation at our institute revealed that the solid-fluid-fluid three-phase line of the system helium-nitrogen shows two quadruple points in the pressure range up to 10 GPa. Since each quadruple point is connected with four three-phase lines, the phase diagram is very complicated. We have detected the phase transitions representing solid-solid-fluid equilibria. Moreover, two lines of constant composition have been determined as a function of temperature and pressure. These results are discussed together with the implications for the phase diagram of both He-N2 and pure nitrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500704
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  • 2
    Electronic Resource
    Electronic Resource
    The thermal conductivity of propane (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 1013-1027 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; propane ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper presents thermal conductivity measurements of propane over the temperature range of 192–320 K, at pressures to 70 MPa, and densities to 15 mol · L−1, using a transient line-source instrument. The precision and reproducibility of the instrument are within ±0.5%. The measurements are estimated to be accurate to ±1.5%. A correlation of the present data, together with other available data in the range 110–580 K up to 70 MPa, including the anomalous critical region, is presented. This correlation of the over 800 data points is estimated to be accurate within ±7.5%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503170
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  • 3
    Electronic Resource
    Electronic Resource
    Phase behavior of mixtures at very high pressures (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 1-14 
    Details
    ISSN: 1572-9567
    Keywords: diamond anvil cell ; high pressure ; mixtures ; phase equilibria ; solutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The invention of the diamond anvil cell (DAC) has been an enormous stimulus to high-pressure research. This technique has only recently been used to investigate the behavior of binary systems, probably because of the extra experimental problems which arise in the study of mixtures. It will be shown that a variety of aspects of the behavior of the mixture can, nevertheless, be studied under extreme conditions. Although the first investigations were carried out only recently, some very interesting results have already been obtained. A variety of two-components systems has been studied, e.g., He-Kr, Ne-Xe, He-H2, NH3-H2O, and N2-He2. Some of these results are discussed. Finally, a comparison is made between experimental results and theoretical calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500703
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of pressure on the solid-liquid phase equilibria of binary organic systems (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 27-34 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; mixtures ; organic liquid ; phase equilibrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid-liquid phase equilibria of the binary mixtures of the organic liquids have been investigated at temperatures from 278 to 343 K and pressures up to 500 MPa using a high-pressure optical vessel. The systems investigated are as follows: (1) simple eutectic systems-benzene + cyclohexane system and benzene + 2-methyl-2-propanol system; (2) eutectic systems with formation of intermolecular compounds — carbon tetrachloride + p-xylene system and carbon tetrachloride + benzene system; (3) partial solid solution system-α-methylnaphthalene + β-methylnaphthalene system; and (4) complete solid solution system-chlorobenzene + bromobenzene system. The uncertainties of the measurements of temperature, pressure and composition are within ±0.1 K, ± 0.5 MPa, and ±0.001 mole fraction, respectively. The freezing and melting temperatures at a constant composition increase monotonously with pressure. The eutectic mixture becomes richer in the component whose temperature coefficient of the freezing pressure is larger and the eutectic temperature rises monotonously with increasing pressure in the eutectic systems. The pressure-temperature-composition relation of the solid-liquid phase equilibria can be expressed satisfactorily by an equation newly proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500705
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  • 5
    Electronic Resource
    Electronic Resource
    Theoretical description of the graphite, diamond, and liquid phases of carbon (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 227-236 
    Details
    ISSN: 1572-9567
    Keywords: carbon phases ; diamond ; electronic effects ; graphite ; melting ; high pressure ; high temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A three-phase equation-of-state model, to be used in high-pressure high-density simulations of systems containing carbon, is described for the system graphite-diamond-liquid. The solid phases are represented by cold lattice and thermal energy terms. Simple additivity of the energy terms is assumed and the cold curve is a modified Birch form. Liquid states for diamond and graphite are obtained by a previously described scaling model. The actual Gibbs free energy of the liquid state uses the free energy of these liquids in a mixture model that includes an entropy of mixing and a pressure-dependent strain term. It is noted that the thermal expansion coefficient and the Grüneisen gamma increase faster above 3000 K than the usual approximation for the volume dependence would predict. The result is a phase diagram that fits all available data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500721
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  • 6
    Electronic Resource
    Electronic Resource
    Density and viscosity of linear perfluoropolyethers under high pressures (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 857-870 
    Details
    ISSN: 1572-9567
    Keywords: compressibility ; density ; fluorocarbon oil ; free-volume equation ; high pressure ; perfluoropolyether ; specific volume ; Tait equation ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New experimental data on the density and viscosity of linear, unbranched perfluoropolyethers are presented at temperatures from 273 to 333 K and pressures up to 180 MPa. The measurements were carried out by a high-pressure burrette apparatus and a falling-cylinder viscometer. The uncertainties of the measurements are estimated to be less than 0.09% for the specific volume and 2.5% for the viscosity. The P-V data at each temperature are correlated satisfactorily by the Tait equation. The viscosity data are also analyzed and correlated with pressure or molar volume by several empirical and theoretical equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00514481
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  • 7
    Electronic Resource
    Electronic Resource
    PVT and derived thermodynamic properties for the glycine-water system at temperatures from 298 to 323 K and pressures up to 300 MPa (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 35-45 
    Details
    ISSN: 1572-9567
    Keywords: glycine ; high pressure ; PVT relation ; Tait equation ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The specific volumes for the glycine-water system have been measured in the temperature range 298–323 K and at pressures up to 300 MPa, using a glass piezometer. The uncertainties in the specific volume are estimated to be less than 0.03%. The PVT relations are correlated by the Tait equation. Good agreement was found with correlations by the Tait equation using a simple extension similar to that proposed by Dymond and Malhotra. The isothermal compressibility and apparent molar volume of glycine are calculated by the Tait equation. The apparent molar volume of glycine increases with increasing pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500706
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  • 8
    Electronic Resource
    Electronic Resource
    A vibrating-rod densimeter (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 871-883 
    Details
    ISSN: 1572-9567
    Keywords: densimeter ; density ; high pressure ; n-heptane ; vibrating wire
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements are reported that confirm the applicability of the theory of a vibrating-rod densimeter to a practical instrument. It is demonstrated that with such a device, liquid density measurements evaluated on an absolute basis can be made with an accuracy of ±0.2% at pressures up to 100 MPa. When the density of the liquid is evaluated on a relative basis, a precision of ±0.1% can be achieved over the same range of pressure. Future developments of the instrument that would greatly enhance its sensitivity and that rely upon the availability of a proven theory are therefore now possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00514482
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  • 9
    Electronic Resource
    Electronic Resource
    The phase diagram of the solid methanes (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 1205-1212 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; isotope effects ; methane (solid) ; nuclear magnetic resonance ; phase diagrams
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A comparative study is presented of the phase diagrams of the solid methanes CH4, CH3D, CH2D2, CHD3, and CD4 obtained experimentally using NMR techniques at pressures up to 9 kbar. Polynomial representations of the I–II, I–III and II–III phase transition lines are given. The experimental conditions under which solid methane transforms to phase IV are discussed and polynomial representations of the I–IV, the IV–I, and the IV–II transition lines are also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500571
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  • 10
    Electronic Resource
    Electronic Resource
    The PVT behavior of liquid 1,1,1- and 1,1,2-trichloroethane (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 1229-1234 
    Details
    ISSN: 1572-9567
    Keywords: liquid volume ; high pressure ; PVT ; 1,1,1-trichloroethane ; 1,1,2-trichloroethane ; Tait equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The PVT behavior of liquid 1,1,1- and 1,1,2-C2H3Cl3 has been determined at 298.15, 323.15, 348.15, 373.15, and 398.15 K and at different pressures to about 100 MPa. The experimental results are shown in tabulated form. Specific volumes at high pressures are represented by the Tait equation. These results are also compared with the results obtained by a generalized Tait equation and other correlation methods. The generalized Tait equation is found to be more suitable to explain this study than the other correlations tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500574
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  • 11
    Electronic Resource
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    Ultrasonic speed in mixtures of monochlorodifluoromethane and monochloropentafluoroethane under high pressures (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 661-671 
    Details
    ISSN: 1572-9567
    Keywords: binary mixture ; critical region ; high pressure ; R22 ; R502 ; R115 ; refrigerants ; ultrasonics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ultrasonic speed u of [(1 -ϰ) CHClF2(1) + ϰC2ClF5(1)] including the azeotropic mixture [CHClF2(1) + C2ClF5(1)] was measured at pressures up to 51 MPa within the temperature range 283.15 to 373.15 K, using a sing-around technique operated at a frequency of 2 MHz with an estimated uncertainty of less that ±2.4 m·s−1. For ϰ = 0.1537 and 0.6268, measurements of the vapor pressure are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00507987
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  • 12
    Electronic Resource
    Electronic Resource
    Thermal conductivity of liquids: Prediction based on a group-contribution scheme (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 779-791 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; liquids ; prediction ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new semiempirical predictive scheme for the thermal conductivity of liquids, based on an extension of concepts derived from the rigid-sphere model of dense-fluid transport properties, is presented. The scheme makes use of the idea of group contributions to the molecular volume and is developed with the aid of accurate thermal conductivity data for the alkanes, the aromatic hydrocarbons, the alcohols, and the diols, along the saturation line and at elevated pressures. The procedure has been tested against other thermal conductivity data, not included in its formulation, and has been found to predict values within ±4% of the experimental data in the temperature range 110–370 K for pressures up to 600 MPa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00514475
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  • 13
    Electronic Resource
    Electronic Resource
    Viscosities of six 1-Alkanols at temperatures in the range 298–348 K and pressures up to 200 MPa (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 833-843 
    Details
    ISSN: 1572-9567
    Keywords: decanol ; dodecanol ; falling-body viscometer ; free volume ; hexadecanol ; hexanol ; high pressure ; octanol ; significant structure theory ; tetradecanol ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Viscosities of six higher 1-alkanols (1-hexanol, 1-octanol, 1-decanol, 1-dodecanol, 1-tetradecanol, and 1-hexadecanol) have been determined at temperatures from 298 to 348 K and pressures up to 200 MPa. The viscosity measurements were performed using a falling-body viscometer with an uncertainty of ±5%. Simple equations are presented to express the experimental viscosities as a function of temperature and pressure within the experimental uncertainty. The relationship between the viscosity and the density of these alkanols is discussed in terms of the significant structure theory extended to high pressures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00514479
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  • 14
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    Volumetric properties of 1-alkanols at temperatures in the range 298–348 K and pressures up to 40 MPa (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 885-897 
    Details
    ISSN: 1572-9567
    Keywords: decanol ; density ; dodecanol ; hexadecanol ; hexanol ; high pressure ; isothermal compressibility ; octanol ; Tait equation ; tetradecanol ; thermal expansion coefficient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Molar volumes, thermal expansion coefficients, and isothermal compressibilities of six higher 1-alkanols (1-hexanol, 1-octanol, 1-decanol, 1-dodecanol, 1-tetradecanol, and 1-hexadecanol) have been determined at temperatures from 298 to 348 K and pressures up to 40 MPa. The density measurements were performed using a vibrating densitometer with an uncertainty of ±0.06%. The relationship between the properties and the structures of these alkanols is discussed in terms of the carbon-chain lengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00514483
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  • 15
    Electronic Resource
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    Thermal conductivity and thermal diffusivity of xylene isomers in the temperature range 308–360 K at pressures up to 0.38 GPa (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 21-35 
    Details
    ISSN: 1572-9567
    Keywords: heat capacity ; high pressure ; m-xylene ; o-xylene ; p-xylene ; thermal conductivity ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New, absolute measurements of the thermal conductivity of the three xylene isomers within the temperature range 308–360 K for pressures up to 0.38 GPa are reported. In addition, for two of the isomers, m-xylene and p-xylene, it has been possible to measure the thermal diffusivity simultaneously within the same range of conditions. The accuracy of the thermal conductivity data reported is one of ±0.3%, whereas for the thermal diffusivity the estimated accuracy is ±6%. It is found that the density dependence of the thermal conductivity for all of the xylenes can be well represented by one equation based on a rigid-sphere model in the same way that has proved successful for normal alkanes. The thermal diffusivity data have been employed to derive heat capacities for the xylenes over a range of pressures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503997
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  • 16
    Electronic Resource
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    Solid-liquid phase equilibria of benzene + 2-methyl-2-propanol system under high pressures (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 61-71 
    Details
    ISSN: 1572-9567
    Keywords: benzene ; high pressure ; 2-methyl-2-propanol ; solid-liquid phase equilibrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid-liquid phase equilibria of the benzene + 2-methyl-2-propanol system have been investigated at temperatures from 278 to 323 K and pressures up to 300 MPa using a high-pressure optical vessel. The uncertainties of the measurements of temperature, pressure and composition are within ±0.1 K, ±0.5 MPa, and ±0.001 mole fraction, respectively. The freezing pressure at a constant composition increases monotonously with pressure. The eutectic point shifts to a higher temperature and benzene-rich composition with increasing pressure. In order to describe the pressure-temperature-composition relation of high-pressure solid-liquid phase equilibria, a new simple equation has been proposed as follows: $$In x_i (P,T) = - \frac{1}{{RT}}\{ C(T)[P - B(T)] + D(T)[P^2 - B(T)^2 ]\} $$ where B, C, and D are the temperature-dependent coefficients and are expressed by the polynomials of reciprocal of temperature. It is found that the solid-liquid coexistence curves of both eutectic systems and solid-solution systems can be correlated satisfactorily by this equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00504000
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  • 17
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    Compressibility and sound velocity measurements on N2 up to 1 GPa (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 103-116 
    Details
    ISSN: 1572-9567
    Keywords: adiabatic compressibility ; equation of state ; density ; high pressure ; isothermal compressibility ; nitrogen ; pVT ; sound velocity ; ultrasonics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A gas expansion technique has been used to determine the pVT properties of N2 up to 1 GPa at 298.15 K, with an accuracy of 0.08% in density, 1 mK in temperature, and 0.05%+0.2 MPa in pressure. The sound velocity has been measured by a phase-comparison pulse-echo technique between 123 and 298 K at intervals of 25 K and at pressures up to 1 GPa, with an accuracy of better than 0.02% in sound velocity, 10 mK in temperature, and 0.05%+0.2 MPa in pressure. An equation of state is presented that correlates the density data over the wide pressure range of 36–1000 MPa with maximum deviations between the calculated and the experimental densities of less than 0.05%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00504003
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  • 18
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    Thermal conductivity of liquid halogenated ethanes under high pressures (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 465-479 
    Details
    ISSN: 1572-9567
    Keywords: fluorocarbon ; halogenated ethane ; liquid ; high pressure ; refrigerant ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New experimental data on the thermal conductivity of liquid halogenated ethanes, R112 (CCl2F-CCl2F), R113 (CCl2F-CClF2), R114 (CClF2-CClF2), R114B2 (CBrF2-CBrF2), and R123 (CHCl2-CF3), are presented in the temperature range from 283 to 348 K at pressures up to 200 MPa or the freezing pressures. The measurements were carried out by a transient hot-wire apparatus within an uncertainty of ±1.0%. The thermal conductivity data obtained have been analyzed by means of the corresponding-states principle and other empirical methods. It is found that the corresponding-states correlation λ=f(Tr, Pr) holds well for R112, R113, and R114. The thermal conductivity can also be correlated satisfactorily with temperature, pressure, and molar volume by a similar expression to the Tait equation and the dense hard-sphere model presented by Dymond.
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    URL: http://dx.doi.org/10.1007/BF00503147
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  • 19
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    Viscosity of aqueous solutions of 1,2-ethanediol and 1,2-propanediol under high pressures (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 511-523 
    Details
    ISSN: 1572-9567
    Keywords: aqueous alcohol solution ; ethanediol ; ethylene glycol ; falling-cylinder viscometer ; free-volume theory ; high pressure ; pressure effect ; propanediol ; propylene glycol ; viscosity ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New experimental data on the viscosity of aqueous solutions of 1,2-ethanediol (ethylene glycol) and 1,2-propanediol (propylene glycol) are presented at 298 and 323 K under pressures up to 120 MPa. The measurements were performed by a falling-cylinder viscometer on a relative basis with an uncertainty of less than ±2%. The viscosity of these aqueous solutions at a constant temperature and pressure increases monotonously with increasing concentrations of diols (glycols) and is slightly lower than the mole fraction average value at each composition. The viscosity also increases almost linearly with pressure at a constant temperature and composition. The pressure coefficient of the viscosity, (∂η/∂P)T,x, increases with decreasing temperature and increasing concentrations of diols. The experimental results are correlated with pressure, density, and composition by several empirical equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503150
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  • 20
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    Isochoric (p, v, T) measurements on CO2 and (0.98 CO2+0.02 CH4) from 225 to 400 K and pressures to 35 MPa (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 547-557 
    Details
    ISSN: 1572-9567
    Keywords: carbon dioxide ; density ; high pressure ; isochoric ; mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Comprehensive isochoric (p, v, T) measurements have been obtained for (0.98 CO2+0.02 CH4) at densities from 1 to 26mol·dm−3. Supplemental isochoric (p, v, T) measurements have been obtained for high-purity CO2 at densities from 12 to 24 mol·dm−3. Measurements of p(T) cover a broad range of temperature, 225 to 400 K, at pressures to 35 MPa. Comparisons have been made with independent sources and with a predictive method based on corresponding states.
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    URL: http://dx.doi.org/10.1007/BF00503153
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  • 21
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    The Tait equation: 100 years on (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 941-951 
    Details
    ISSN: 1572-9567
    Keywords: density ; high pressure ; Tait equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The “Tait equation,” which is now widely used to fit liquid density data over wide pressure ranges, is a modification of the original equation of Tait, published 100 years ago, to fit his results on the compressibility of fresh water and seawater at different pressures. The range of applicability of these different equations is discussed and it is concluded that their simplicity and accuracy in reproducing high pressure density data for dense gases, liquids, solids, and liquid mixtures will ensure their continued use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01133262
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  • 22
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    Measurement of the compressibility and sound velocity of neon up to 1 GPa (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 803-812 
    Details
    ISSN: 1572-9567
    Keywords: compressibility ; equation of state ; high pressure ; neon ; pVT ; sound velocity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The density of neon has been determined at 298.15 K as a function of pressure from 80 MPa to 1 GPa. The precision of the measurements is 0.03%, while the estimated absolute accuracy is between 0.05 and 0.09%. The sound velocity has been measured between 98 and 298 K with intervals of 25 K and at pressures up to 1 GPa, with an accuracy generally better than 0.06%. The adiabatic compressibility and the ratio of the specific heats are calculated by combining pVT with velocity-of-sound data at 298 K. Several equations of state are fitted to the density data at 298.15 K.
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    URL: http://dx.doi.org/10.1007/BF00503246
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  • 23
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    An automated flow calorimeter for heat capacity and enthalpy measurements (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 993-1002 
    Details
    ISSN: 1572-9567
    Keywords: calorimetry ; flow calorimeter ; heat capacity (isobaric) ; high pressure ; high temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An automated flow calorimeter has been developed for the measurement of heat capacity and latent enthalpies of fluids at elevated temperatures (300–700 K) and pressure (〈30M Pa) with a design accuracy of 0.1%. The method of measurement is the traditional electrical power input flow calorimeter, utilizing a precision metering pump, which eliminates the need for flow-rate monitoring. The calorimeter cell uses a unique concentric coil design with passive metal radiation shields and active guard heaters to minimize heat leakage, eliminate the traditional constant-temperature bath, and facilitate easy component replacement. An additional feature of the instrument is a complete automation system, greatly simplifying operation of the apparatus. A novel multitasking software scheme allows a single microcomputer simultaneously to control all system temperatures, provide continuous monitoring and updates on system status, and log data. Preliminary results for liquid water mean heat capacities show the equipment to be performing satisfactorily, with data accuracies of better than ±0.3%. Minor equipment modifications and better thermometry are required to reduce systemic errors and to achieve the designed operational range.
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    URL: http://dx.doi.org/10.1007/BF01133267
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    The thermal conductivity of talc as a function of pressure and temperature (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 1111-1120 
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    ISSN: 1572-9567
    Keywords: high pressure ; hot-wire method ; talc ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Talc is a commonly used pressure-transmitting and gasket material for high-temperature and -pressure applications. The thermal conductivity of talc at high pressures and temperatures is therefore valuable in the design of high-pressure experiments and apparatus. In this paper measurements of the thermal conductivity of fired and unfired talc are presented. Measurements were made at pressures ranging from 0 to 2.5 GPa and temperatures from 150 to 900 K. The thermal conductivity was measured with the hotwire technique. The thermal conductivity results for both the fired and the unfired talc show a slight increase with increasing pressure. The absolute value of the thermal conductivity of talc is lower in the fired material than in the unfired material. In both cases, the thermal conductivity varied less than 15% over the temperature range studied. X-Ray diffraction studies have shown talc to be highly disordered. The results are shown to be consistent with those expected for a disordered crystal.
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    Measurements of the thermal conductivity of aqueous LiBr solutions at pressures up to 40 MPa (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 317-329 
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    ISSN: 1572-9567
    Keywords: aqueous solutions ; high pressure ; lithium bromide ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper describes absolute measurements of the thermal conductivity of aqueous LiBr solutions in the concentration range 5 to 15m (molality), the temperature range 30 to 100°C, and the pressure range 0.1 to 40 MPa. The measurements have been performed with the aid of a transient hot-wire apparatus employing a thin tantalum wire coated with an anodic tantalum pentoxide insulation layer. In using the tantalum wire, a modification of the bridge circuit has been made to keep the electric potential of the wire always higher than the ground level in order to protect the insulation layer from breakdown. The experimental data, which have an estimated accuracy of ±0.5%, have been correlated in terms of the polynomials of concentration, temperature, and pressure for practical use. Also, it has been found that the pressure coefficient of the thermal conductivity decreases with increasing concentrations.
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    Measurement of the compressibility and sound velocity of helium up to 1 GPa (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 425-438 
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    ISSN: 1572-9567
    Keywords: adiabatic compressibility ; equation of state ; density ; high pressure ; isothermal compressibility ; helium ; pVT ; sound velocity ; ultrasonics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By using a gas expansion technique, the density of helium has been determined at 298.15 K as a function of pressure from 100 MPa to 1 GPa. The precision of the measurements is 0.02%, while the estimated absolute accuracy is about 0.08%. The sound velocity has been measured by a phase-comparison pulseecho technique between 98 and 298 K with intervals of 25 K and at pressures up to 1 GPa, with an accuracy generally better than 0.04%. By combining pVT with velocity-of-sound data at 298 K, the adiabatic compressibility and the ratio of the specific heats are calculated. The experimental sound velocities are compared with the values, predicted from an equation of state as proposed by Hansen.
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    The thermal conductivity of ethylene and ethane (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 481-500 
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    ISSN: 1572-9567
    Keywords: Ethane ; ethylene ; high pressure ; thermal conductivity ; transport properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The results of new, absolute measurements of the thermal conductivity of ethylene and ethane are reported. The measurements extend over the temperature range 308 to 425 K and for pressures up to 10 MPa and their accuracy is estimated to be ±0.3% under most conditions, although it deteriorates to ±2% at the lowest temperature and highest pressure near critical conditions. In the limit of zero density the data are employed to determine the diffusion coefficient for internal energy in the gases with the aid of independent measurements of other properties. It is found that vibrational energy transport must occur at a faster rate than diffusion of the molecules themselves, in contrast to the behavior usually observed for rotational energy. At elevated densities the concept of a temperature-independent excess thermal conductivity is found to fail at the highest level of accuracy owing to the proximity of the temperature range studied to the critical point. Nevertheless, the concept remains a useful predictive tool of modest accuracy.
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    Thermal conductivity and Lorenz function of zinc under pressure (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 577-585 
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    ISSN: 1572-9567
    Keywords: high pressure ; Lorenz number ; pressure dependence ; thermal conductivity ; thermal diffusivity ; thermoelectric power ; zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivity λ and the Lorenz function L of polycrystalline zinc have been calculated from measured values of the thermal diffusivity a and the electrical resistivity γ as functions of pressure P up to 2 GPa at room temperature. The effects of convection in, and freezing of, the pressure transmitting medium are discussed. Both λ and L increase with increasing P, with pressure coefficients of 8.7×10−2 and 1.5×10−2 GPa−1, respectively. The volume dependence of L is found to be similar to that found for other simple metals. Data are also given for the Seebeck coefficient S as a function of P and for a(T) and λ(T) between 55 and 300 K.
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    Effect of pressure on the solid-liquid phase equilibria of (carbon tetrachloride + p-xylene) and (carbon tetrachloride+benzene) systems (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 535-545 
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    ISSN: 1572-9567
    Keywords: benzene ; carbon tetrachloride ; high pressure ; intermolecular compound ; p-xylene ; solid-liquid phase equilibria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid-liquid phase equilibria of the carbon tetrachloride + p-xylene and the carbon tetrachloride+benzene systems have been investigated at temperatures from 278 to 323 K and pressures up to 500 MPa using a high-pressure optical vessel. The uncertainties in the measurements of temperature, pressure, and composition are within ±0.1 K, ±0.5 MPa, and ±0.001 mole fraction, respectively. In the former system, which has an intermolecular compound with a congruent melting point, the freezing temperature at a constant composition increases monotonously with increasing pressure. The two eutectic points of this system shift to higher temperatures and richer compositions of the compound with increasing pressure. In the latter system, which has two intermolecular compounds with incongruent melting points, the one compound disappears under the present experimental conditions and the incongruent melting point of the other compound changes to the congruent melting point under high pressures. The solid-liquid coexistence curves of these systems can be correlated satisfactorily by the equation previously proposed.
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    p, V, T and derived thermodynamic data for bromobenzene at temperatures from 278 to 323 K and pressures up to 280 MPa (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 557-565 
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    ISSN: 1572-9567
    Keywords: bromobenzene ; hard-sphere diameter ; high pressure ; internal pressure ; isobaric expansivity ; isothermal compressibility ; p, V, T data
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    Topics: Physics
    Notes: Abstract Experimentally determined p, V, T data are reported for bromobenzene at 278, 288, 298, 313, and 323 K, at pressures up to about 280 MPa or (at 278 and 288 K) a lower pressure slightly below the freezing pressure at the temperature of measurement. Values of the isobaric expansivity, isothermal compressibility, internal pressure, and equivalent hard-sphere diameter, derived from the p, V, T data, are presented.
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    Temperature and pressure effects on the thermal conductivity of TlCl and TlBr (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 607-620 
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    ISSN: 1572-9567
    Keywords: high pressure ; hot-wire method ; thallium bromide (TlBr) ; thallium chloride (TlCl) ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hot-wire method was used to measure the thermal conductivity of both TlCl and TlBr. The measurements were performed in the temperature range 120–300 K and at pressures up to 2.3 GPa. An analysis of the thermal conductivity data showed that the Leibfried-Schlömann formula is a better description for TlBr than for TlCl. For both TlBr and TlCl the effect of optic phonons on thermal conductivity cannot be ignored.
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    Solid-liquid phase equilibria of (α-methylnaphthalene + β-methylnaphthalene) and (chlorobenzene + bromobenzene) systems under high Pressures (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 671-680 
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    ISSN: 1572-9567
    Keywords: bromobenzene ; chlorobenzene ; high pressure ; α-methylnaphthalene ; β-methylnaphthalene ; solid-liquid phase equilibrium ; solid solution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid-liquid phase equilibria of the (α-methylnaphthalene + β-methylnaphthalene) and the (chlorobenzene + bromobenzene) systems have been investigated at temperatures from 278 to 343 K and pressures up to 500 MPa using a high-pressure optical vessel. The uncertainties of the measurements of temperature, pressure, and composition were within ±0.1 K, ±0.5 MPa, and ±0.001 mole fraction, respectively. In both systems, the freezing and melting pressures at a constant composition increase almost linearly with increasing temperatures. In the former system, where the two components can form a solid solution with one another to a limit extent, the eutectic point shifts to a higher temperature and to a α-methylnaphthalene-rich composition with increasing pressures. In the latter system, where the two components are completely soluble in each other in the solid phase, the freezing points of all mixtures lie between those of the pure components at each pressure. It is found that the coexistence curves obtained can be expressed by a quadratic equation in pressure.
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    Thermal conductivity of steam from 250 to 510°C at pressures up to 95 MPa including the critical region (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 283-292 
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    ISSN: 1572-9567
    Keywords: critical range ; high pressure ; thermal conductivity ; steam
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    Topics: Physics
    Notes: Abstract New measurements of the thermal conductivity of steam have been performed in the temperature range 250–510°C and in the pressure range from 1 up to 95 MPa. Most of the measurements were taken at temperatures greater than the critical temperature, where the enhancement of the thermal conductivity is observed. The experimental values are compared to the IAPS formulation for the thermal conductivity of water.
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    Thermal conductivity of ethane in the critical region (1987)
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    International journal of thermophysics 8 (1987), S. 293-304 
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    ISSN: 1572-9567
    Keywords: critical region ; ethane ; high pressure ; thermal conductivity
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    Topics: Physics
    Notes: Abstract A coaxial cylinder method was used to measure the thermal conductivity of ethane in the pressure range from 10 up to 280 bar and in the temperature range from 308 up to 365 K.
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    Solid-liquid phase equilibria of benzene + cyclohexane system under high pressures (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 415-424 
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    ISSN: 1572-9567
    Keywords: benzene ; cyclohexane ; eutectic point ; high pressure ; solid-liquid phase equilibrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Solid-liquid phase equilibria of the benzene + cyclohexane system have been investigated experimentally at temperatures from 278 to 323 K and pressures up to 500 MPa using a newly designed optical vessel. The uncertainties of the measurements of temperature, pressure, and composition are within ±0.1 K, ±0.5 MPa, and ±0.001 mole fraction, respectively. The solid-liquid equilibrium pressure at a constant composition increases almost linearly with increasin temperature. The eutectic point shifts to a higher temperature and to a benzenerich composition with increasing pressure. This trend is found to agree with the direction predicted by the van Laar equation. The solid-liquid coexistence curves can be expressed by the Wilson equation with a mean deviation of 0.007 and a maximum deviation of 0.029 in mole fraction.
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    Freezing pressures, p, V, T, and self-diffusion data at 298 and 313 K and pressures up to 300 MPa for 1,3,5-trimethylbenzene (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 71-79 
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    ISSN: 1572-9567
    Keywords: freezing pressure ; high pressure ; isothermal compressibility ; p, V, T data ; self-diffusion ; 1,3,5-trimethylbenzene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mesurements are reported for the melting point of 1,3,5-trimethylbenzene at pressures up to 345 MPa. Self-diffusion coefficients and p, V, T data have been obtained at 298 and 313 K for pressures up to 280 MPa. Isothermal compressibilities have been calculated from the p, V, T results. The freezing pressures at 0.1 MPa correspond to previously reported values for modification III of trimethylbenzene. Equivalent hard-sphere diameters estimated from the melting point and p, V, T data are used to apply the rough hard-spheres theory to the self-diffusion data; the calculations indicate that there is random packing of the particles.
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    Volume ratios for n-pentane in the temperature range 278–338 K and at pressures up to 280 MPa (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 231-238 
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    ISSN: 1572-9567
    Keywords: high pressure ; isothermal compressibility ; n-pentane ; volume ratio
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    Topics: Physics
    Notes: Abstract Volume ratios (V P/V 0.1), and isothermal compressibilities calculated from them, are reported for n-pentane for seven temperatures in the range 278 to 338 K for pressures up to 280 MPa. The isobaric measurements were made with a bellows volumometer for which a novel technique had to be devised to enable measurements to be made above the normal boiling point (309.3 K). The accuracy of the volume ratios is estimated to be ±0.05 to 0.1% up to 303.15 K and ±0.1 to 0.2% from 313.15 to 338.15 K. The volume ratios are in good agreement with those calculated from recent literature data up to the maximum pressure of the latter, viz., 60 MPa.
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    Hydrogen component fugacities in binary mixtures with carbon dioxide: Pressure dependence (1987)
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    International journal of thermophysics 8 (1987), S. 205-216 
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    ISSN: 1572-9567
    Keywords: carbon dioxide ; fugacity ; high pressure ; hydrogen ; hydrogen + carbon dioxide binary system ; mixtures
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    Topics: Physics
    Notes: Abstract The fugacity coefficients of hydrogen in binary mixtures with carbon dioxide were measured isothermally using a physical equilibrium technique. This technique involves the use of an experimental chamber which is divided into two regions by a semipermeable membrane. Hydrogen can penetrate and pass through the membrane, while carbon dioxide cannot. During the approach to equilibrium, the pressure of pure hydrogen on one side of the membrane approaches the partial pressure of hydrogen in the mixture on the other side of the membrane. This allows a direct measurement of the hydrogen component fugacity at a given mixture mole fraction. In this study, results are reported for measurements made on the hydrogen + carbon dioxide binary at 130°C (403 K), with total mixture pressure of 3.45, 5.17, 8.62, 10.34, and 13.79 MPa. General trends in the experimental results are discussed, and comparisons are made with predictions from the Redlich-Kwong, Peng-Robinson, and extended corresponding-states models.
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    Volumetric behavior of pure alcohols and their water mixtures under high pressure (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 47-70 
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    ISSN: 1572-9567
    Keywords: alcohols ; aqueous mixtures ; butanols ; compressibility ; ethanol ; excess volume ; high pressure ; methanol ; propanols ; specific volume ; Tait equation ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The specific volumes of C1-C4 alcohols and binary mixtures of water with methanol, ethanol, 1-propanol, 2-propanol, and 2-methyl-2-propanol are presented as functions of temperature, pressure, and composition. The measurements were carried out using a modified Adams piezometer and a high-pressure burette method in a temperature range from 283.15 to 348.15 K at pressures up to 350 MPa. The uncertainties in the specific volume obtained are estimated to be less than 0.09%. The specific volumes of the pure alcohols and their mixtures with water are found to decrease monotonously with increasing pressure. The numerical P-V relations at each temperature and composition are correlated satisfactorily as a function of pressure by the Tait equation. Definite inflections appear on the isobars of isothermal compressibility or partial molar volume versus composition of alcohol + water mixtures.
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    Densities of n-alkanes and their mixtures at elevated pressures (1987)
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    International journal of thermophysics 8 (1987), S. 541-555 
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    ISSN: 1572-9567
    Keywords: alkanes ; density ; high pressure ; liquid mixtures ; Tait equation
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    Topics: Physics
    Notes: Abstract Accurate density data for n-alkanes over a wide range of temperature and pressure have been used to test existing correlation and prediction methods. It is found that the most successful representation at temperatures up to 0.66 times the critical temperature and pressures up to 150 MPa is given by the Tait equation in the form (ρ−ρ0)/ρ=C log [(B + P)/(B + P 0)], where subscript 0 refers to 0.101 MPa, with C equal to 0.2000, and [B+(C n −6)], where C n is the number of carbon atoms in the alkane chain, is a smooth function of reduced temperature. A simple extension of this method to mixtures gives an excellent prediction of densities at pressures up to 150 MPa over the same reduced temperature range.
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    Thermal conductivity of propane in the temperature range 25–305°C and pressure range 1–70 MPa (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 27-38 
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    ISSN: 1572-9567
    Keywords: critical region ; high pressure ; propane ; thermal conductivity
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    Topics: Physics
    Notes: Abstract A coaxial cylinder method was used to measure the thermal conductivity of propane in the pressure range from 1 to about 70 MPa and in the temperature range from room temperature to 305°C. The behavior of the thermal conductivity in the critical region was carefully investigated.
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    Vapor-liquid equilibrium and volumetric properties calculations for solutions in the supercritical carbon dioxide (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 635-646 
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    ISSN: 1572-9567
    Keywords: carbon dioxide ; critical phenomena ; equations of state ; high pressure ; phase equilibria ; solutions
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    Topics: Physics
    Notes: Abstract The calculations of gas solubilities in supercritical solvents require equations of state remaining accurate in the critical range, which are difficult to obtain with classical models. In this work, the Helmholtz energy of a mixture is considered as the sum of the Helmholtz energies of pure components taken at a constant packing fraction and of a residual term which may have the form of a RedlichKister, Van Laar, NRTL, UNIQUAC, or UNIFAC function. Thus it is possible to assign to a given component an equation of state whose form is different from that of the others. This model has been applied to binary systems containing supercritical carbon dioxide. The results are improved with respect to those obtained with the classical model for vapor-liquid equilibria and for volumetric properties.
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    Specific heats (C v) of saturated and compressed liquid and vapor carbon dioxide (1986)
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    International journal of thermophysics 7 (1986), S. 1163-1182 
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    ISSN: 1572-9567
    Keywords: adiabatic calorimetry ; carbon dioxide ; heat capacity ; high pressure ; saturated liquid
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    Topics: Physics
    Notes: Abstract Specific heats of saturated liquid carbon dioxide (C sat) have been measured in the temperature range 220 to 303 K. Specific heats at constant volume (C v) have been measured at 12 densities ranging from 0.2 to 2.5 times the critical density in the temperature range 233 to 330 K, with pressures varying from 3.4 to 32 MPa. The measurements have been conducted in an adiabatic constant-volume calorimeter of conventional design. Uncertainty of the specific heats is estimated to not exceed 2.0%. Comparisons are made with an extended Benedict-Webb-Rubin equation of state and with the results of other workers.
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    Velocity of sound in supercritical water up to 700°C and 300 MPa (1986)
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    International journal of thermophysics 7 (1986), S. 1065-1075 
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    ISSN: 1572-9567
    Keywords: high pressure ; high temperature ; velocity of sound ; water
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    Notes: Abstract The velocity of sound in water was measured up to 700°C and 300 MPa. A classical pulse method has been used. The frequency was typically 5 MHz. The mean accuracy of the data is 0.5% of the velocity. The greatest error in velocity is due to the uncertainty in the temperature measurements at high pressures.
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    Sound speed in liquid lead at high temperatures (1986)
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    International journal of thermophysics 7 (1986), S. 161-165 
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    ISSN: 1572-9567
    Keywords: dynamic technique ; high pressure ; high temperature ; lead ; sound speed ; thermophysical properties
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    Topics: Physics
    Notes: Abstract A dynamic technique, the isobaric expansion experiment (IEX), is used to reach high-temperature and pressure states in liquid lead. A unique technique is described for making sound-speed measurements once a final equilibrium end state is obtained. Data over an extended density range are presented. The sound speed in liquid lead over this range appears to vary linearly with density and has no dependence on temperature within our experimental precision (±7 %).
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    Thermal conductivity and heat capacity of liquid toluene at temperatures between 255 and 400 K and at pressures up to 1000 MPa (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 1147-1161 
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    ISSN: 1572-9567
    Keywords: ac-heated wire method ; heat capacity ; high pressure ; thermal conductivity ; toluene
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    Topics: Physics
    Notes: Abstract The thermal conductivity λ and heat capacity c p of liquid toluene have been measured by the ac-heated wire method up to 1000 MPa in the temperature range from 255 to 400 K. The total error of thermal conductivity measurements is estimated to be about 1 %, and the precision 0.3 %. The heat capacity per unit volume, pc p, obtained directly from the experiment is uncertain within 2 or 3%. The λ vs p isotherms are found to cross one another at approximately 700 MPa. The minima in the pressure (or volume) dependence of cp of toluene are evident at all temperatures investigated.
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    High-pressure, high-temperature thermophysical measurements on tantalum and tungsten (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 167-179 
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    Keywords: high pressure ; high temperature ; liquid metals ; pulse method ; tantalum ; tungsten
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    Notes: Abstract A submillisecond resistive heating technique under high pressure (0.2 GPa) has been applied to the measurement of thermophysical properties of tantalum and tungsten metals in the solid and the liquid state. Agreement between previously published and most of the present results is good.
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    Thermal conductivity of B2O3 glass under pressure (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 267-273 
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    ISSN: 1572-9567
    Keywords: high pressure ; thermal conductivity ; vitreous boron trioxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivity, λ, of vitreous boron trioxide was measured, using a hot-wire procedure, from 170 to 570 K and under pressures of up to 1.7 GPa. The thermal conductivity at room temperature and zero pressure was found to be 0.52 W · m−1 · K−1. The values of the logarithmic pressure derivative, g = d(ln λ)/d(ln ρ), where ρ is the density, were found to be 1.1 for uncompacted glass and 0.7 for glass compacted to 1.2 GPa. The variation of λ with temperature at constant density was approximately linear, with a positive slope of 1.38×10−3W·m−1·K−2.
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    URL: http://dx.doi.org/10.1007/BF00522148
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    p, V, T and derived thermodynamic data for toluene, trichloromethane, dichloromethane, acetonitrile, aniline, and n-dodecane (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 331-351 
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    ISSN: 1572-9567
    Keywords: acetonitrile ; aniline ; dichloromethane ; high pressure ; n-dodecane ; p,V,T data ; toluene ; trichloromethane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experimentally determined p,V,T data are reported for toluene, trichloromethane, dichloromethane, acetonitrile, aniline, and n-dodecane at 278, 288, 298, 313, and 323 K, except for dichloromethane, for which the highest temperature was 298 K. At each temperature, measurements were done at pressures up to about 280 MPa or (for aniline and n-dodecane) at a lower pressure slightly below the freezing pressure at the temperature of measurement. Values of the isobaric expansivity isothermal compressibility and (for toluene, trichloromethane, dichloromethane, and acetonitrile) internal pressure, derived from the p,V,T data, are presented.
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    URL: http://dx.doi.org/10.1007/BF00500267
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    Transport properties of nonelectrolyte liquid mixtures—VII. Viscosity coefficients for isooctane and for equimolar mixtures of isooctane + n-octane and isooctane + n-dodecane from 25 to 100°C at pressures up to 500 MPa or to the freezing pressure (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 233-250 
    Details
    ISSN: 1572-9567
    Keywords: free volume ; Grunberg and Nissan equation ; high pressure ; isooctane ; n-dodecane ; n-octane ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Changes in the high-pressure self-centering falling-body viscometer system, and the new automated data logging system, are described. Viscosity coefficient measurements made with an estimated accuracy of ± 2 % are reported for isooctane and for equimolar mixtures of isooctane + n-octane and isooctane + n-dodecane at 25, 50, 75, and 100°C at pressures up to 500 MPa or to the freezing pressure. The pressure dependence of the results is found to be represented equally well by the recent equation of Makita and by a free-volume form of equation. The Grunberg and Nissan equation gives a good fit to the mixture viscosity coefficient data.
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    URL: http://dx.doi.org/10.1007/BF00522146
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    Evaluation of the thermodynamic properties of tungsten (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 395-409 
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    ISSN: 1572-9567
    Keywords: enthalpy ; equation of state ; heat capacity ; high pressure ; high temperature ; thermodynamic properties ; tungsten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new evaluation of the thermodynamic properties of tungsten has been made. A set of parameters describing the Gibbs energy of each individual phase as a function of temperature and pressure is given. The experimental information on the P, T phase diagram and the thermodynamic data are compared with calculations made using the presented set of parameters.
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    URL: http://dx.doi.org/10.1007/BF00500270
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    Shear viscosity of methanol and methanol + water mixtures under pressure (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 439-450 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; methanol ; mixtures ; viscosity ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Shear viscosities have been measured for methanol up to 400 MPa at 298, 313, and 323 K and for methanol-water mixtures (a) at 0.1 MPa and 278 K and (b) up to 300 MPa at 298 K. Where a comparison is possible the results are in good agreement with literature data. The data for the mixtures are discussed in terms of hydrogen bonding in methanol and water and by the use of excess viscosities.
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    URL: http://dx.doi.org/10.1007/BF00508889
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    Thermal conductivity and heat capacity of solid nabr under pressure (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 177-190 
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    ISSN: 1572-9567
    Keywords: heat capacity ; high pressure ; sodium bromide (NaBr) ; thermal conductivity ; thermal expansivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the transient hot-wire method, measurements were made for solid NaBr of both the thermal conductivity and the heat capacity per unit volume. The measurements were performed in the temperature range 100 to 400 K and at pressures up to 2 GPa. An adiabatic compression technique allowed the determination of the thermal expansivity as a function of pressure at room temperature. The heat capacity did not vary with pressure. Analysis of the thermal conductivity data showed that it can be described adequately by the Leibfried-Schlömann formula. For temperatures up to 400 K only acoustic modes needed to be taken into account. A small contribution of optic modes to the heat transport might be apparent at the highest temperatures.
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    URL: http://dx.doi.org/10.1007/BF00500030
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    Thermal conductivity of solid NaF under high pressure (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 353-365 
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    ISSN: 1572-9567
    Keywords: high pressure ; sodium fluoride (NaF) ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivity (λ) of solid NaF has been measured over the temperature (T) range 100–350 K and at pressures (P) up to 2.5 GPa, using the transient hot-wire method. Results for λ(T,P) could be described to a good approximation by the Leibfried-Schlömann formula. It was found that the isochoric temperature derivative of the thermal resistivity W (= λ−1) increased systematically with the mass ratio for the B1-type phases of the sodium and potassium halides.
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    URL: http://dx.doi.org/10.1007/BF00500268
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    Thermodynamic properties of chromium (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 411-419 
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    ISSN: 1572-9567
    Keywords: chromium ; enthalpy ; heat capacity ; high pressure ; high temperature ; thermodynamic properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper is intended as a short review of the results of thermodynamic measurements available for pure chromium. The various experimental data are combined and a set of parameters describing the Gibbs energy of each individual phase as a function of temperature and pressure is obtained.
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    URL: http://dx.doi.org/10.1007/BF00500271
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    Specific heat capacity of solids under pressure from measurements of (∂T/∂P)s (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 101-105 
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    ISSN: 1572-9567
    Keywords: adiabatic compression ; calculational procedure ; high pressure ; specific heat capacity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A procedure is described for calculating specific heat capacity under pressure, c p (T, P), from data for c p (T, 0) and adiabatic (∂T/∂P) s. The main advantage is that (∂T/∂P)s can be readily measured under high-pressure conditions.
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    URL: http://dx.doi.org/10.1007/BF00505794
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    Thermal conductivity of methane for temperatures between 110 and 310 K with pressures to 70 MPa (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 119-142 
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    ISSN: 1572-9567
    Keywords: density ; high pressure ; hot wire ; methane ; thermal conductivity ; transient measurements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper presents new experimental measurements of the thermal conductivity of methane for 14 temperatures between 110 and 310 K with pressures to 70 MPa and densities from 0 to 30 mol · L−1. The measurements were made with a transient hot-wire apparatus and they cover a wide range of physical states including the dilute gas, the moderately dense gas, the near-critical region, the compressed liquid states, and the vapor at temperatures below the critical temperature. The new measurements are closely spaced in temperature and density to describe the thermal conductivity surface, in particular the critical enhancement which extends to the highest temperature measured. A fit of the thermal conductivity surface allows comparison of the present results to those of others. The comparison reveals several discrepancies inherent in the results of others and in an earlier correlation. The precision (2σ) of the methane measurements is between 0.5 on 0.8 % for wire temperature transients of 4 to 5 K, while the accuracy is estimated to be 1.6%.
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    URL: http://dx.doi.org/10.1007/BF00500027
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    A simple differential thermal analysis technique for determining the pressure dependence of solid-liquid and solid-solid transition temperatures (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 275-284 
    Details
    ISSN: 1572-9567
    Keywords: acetonitrile ; benzene ; carbon tetrachloride ; differential thermal analysis ; high pressure ; phase transition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A simple differential thermal analysis technique for determining solid-liquid and solid-solid transition temperatures as functions of pressure is described. The important feature of the technique is the use of a thin-walled ptfe tube both to contain the sample and to transmit pressure to it. The method has been tested at temperatures in the range 200–310 K at pressures of up to 350 MPa. Transition temperatures as functions of pressure are reported for benzene, carbon tetrachloride, and acetonitrile and compared with literature data.
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    URL: http://dx.doi.org/10.1007/BF00522149
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    Critical evaluation of the thermodynamic properties of molybdenum (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 367-393 
    Details
    ISSN: 1572-9567
    Keywords: enthalpy ; equation of state ; heat capacity ; high pressure ; high temperature ; molybdenum ; thermodynamic properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermodynamic properties and the pressure-temperature phase diagram of pure Mo have been evaluated from experimental information using thermodynamic models for the Gibbs energy of the individual phases. A set of parameters describing the Gibbs energy of the various phases as a function of temperature and pressure is presented. The agreement between experimental data and calculated values is satisfactory.
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    URL: http://dx.doi.org/10.1007/BF00500269
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    Thermal conductivity of methane-ethane mixtures at temperatures between 140 and 330 K and at pressures up to 70 MPa (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 607-617 
    Details
    ISSN: 1572-9567
    Keywords: enhancement ; ethane ; high pressure ; methane ; mixtures ; thermal conductivity ; transient hot-wire apparatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper presents new measurements on the thermal conductivity of three methane-ethane mixtures with methane mole fractions of 0.69, 0.50, and 0.35. The thermal conductivity surface for each mixture is defined by up to 13 isotherms at temperatures between 140 and 330 K with pressures up to 70 MPa and densities up to 25 mol · L−1. The measurements were made with a transient hot-wire apparatus. They cover a wide range of physical states including the dilute gas, the single-phase fluid at temperatures above the maxcondentherm, the compressed liquid states, and the vapor at temperatures below the maxcondentherm. The results show an enhancement in the thermal conductivity in the single-phase fluid down to the maxcondentherm temperature, as well as in the vapor and in the compressed liquid. A curve fit of the thermal conductivity surface is developed separately for each mixture.
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    URL: http://dx.doi.org/10.1007/BF00500333
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    Ultrasonic speeds and densities of poly(dimethylsiloxane) (viscosity grades 30 and 50×10−4 m · s−1) at 298.15, 303.15, and 308.15 K under high pressures (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 451-463 
    Details
    ISSN: 1572-9567
    Keywords: bellows piezometer ; density ; high pressure ; poly(dimethylsiloxane) ; sing-around technique ; ultrasonic speed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ultrasonic speeds and densities of poly(dimethylsiloxane), viscosity grades 30 and 50×10−4 m · s−1 at 298.15 K, were measured at 298.15, 303.15, and 308.15 K. The measurements were carried out using new apparatuses, one for measurement of the speed under pressures up to 200 MPa and another for measurement of the density under pressures up to 100 MPa. The former is constructed with a sing-around technique of the fixed-path type operated at a frequency of 2 MHz, and the latter is a dynamic bellows piezometer. The probable uncertainty in the present results is within ±0.23% for speed and ±0.19% for density for all the experimental conditions. The ultrasonic speed in these fluids at first increases rapidly with pressure and then indicates a mild rise in the highpressure region. Similar pressure effects are observed for the density. The relationship between the speed and the density satisfied a first-order function well. The isentropic compressibility, derived from the speed and density, also showed a large pressure effect. The values and its pressure effects seemed almost independent of the viscosity of poly(dimethylsiloxane).
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    URL: http://dx.doi.org/10.1007/BF00508890
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    Shear viscosity coefficients of compressed gaseous and liquid carbon dioxide at temperatures between 220 and 320 K and at pressures to 30 MPa (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 619-629 
    Details
    ISSN: 1572-9567
    Keywords: carbon dioxide ; density ; high pressure ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The shear viscosity coefficients of compressed gaseous and liquid carbon dioxide hav been measured with the torsional piezoelectric crystal method at temperatures between 220 and 320 K and at pressures to 30 MPa. The dependencies of the viscosity on pressure, density, and temperature and the dependencies of the fluidity (inverse viscosity) on molar volume and temperature have been examined. The measurements on the compressed liquid were correlated with a modified Hildebrand equation.
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    URL: http://dx.doi.org/10.1007/BF00500334
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