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  • thermal conductivity  (46)
  • Springer  (46)
  • 2000-2004  (12)
  • 1985-1989  (34)
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  • Springer  (46)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Transient hot-wire measurements of the thermal conductivity of gases at elevated temperatures (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 245-258 
    Details
    ISSN: 1572-9567
    Keywords: excess properties ; gases ; inelastic collisions ; thermal conductivity ; transient hot-wire instrument
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper describes a new instrument for the measurement of the thermal conductivity of gases over a wide range of thermodynamic states. The instrument operates on the transient hot-wire principle and the design of the cells that is necessary to secure an accuracy of ±0.3% in the thermal conductivity is considered in some detail. A selection of the results on ten pure gases is presented. The data for the monatomic gases in the limit of zero density are employed to confirm the accuracy of the measurements, whereas the results at higher densities for these and other gases are used to examine the concept of a temperature-independent excess thermal conductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500152
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal conductivity of normal pentane in the temperature range 306–360 K at pressures up to 0.5 GPa (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 305-315 
    Details
    ISSN: 1572-9567
    Keywords: alkanes ; hard-sphere theory ; liquid ; normal pentane ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper reports the results of new, absolute measurements of the thermal conductivity of normal pentane in the temperature range 306 to 360 K at pressures up to 0.50 GPa. The experimental data have an estimated uncertainty of ±0.3%. The density dependence of the thermal conductivity along all of the isotherms cannot be represented by a common equation within its estimated uncertainty. Nevertheless, such a universal equation does provide a simple method of correlating the complete set of data with an error of no more than ±2.5%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503944
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  • 3
    Electronic Resource
    Electronic Resource
    A computer-controlled instrument for the measurement of the thermal conductivity of liquids (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 511-519 
    Details
    ISSN: 1572-9567
    Keywords: liquids ; measurement technique ; thermal conductivity ; toluene ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new instrument for the measurement of the thermal conductivity of liquids by the transient hot-wire method is described. The instrument has features in common with earlier versions but employs a novel technique for the determination of the transient temperature rise of the hot wire during the course of a measurement. New determinations of the thermal conductivity of toluene confirm the accuracy of the instrument to be better than 0.5%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503639
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal conductivity of a dendritic ice layer (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 269-278 
    Details
    ISSN: 1572-9567
    Keywords: dendrite ; ice ; solutions ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the thermal conductivities of the frozen layer of aqueous binary solutions have been performed using the transient hot-wire method. Solutions of ethylene glycol and sodium chloride were utilized as the testing fluids, and they were frozen up in the test section in which the platinum wires 40 μm in diameter and 170 mm in length were strung. Measurements were carried out under equilibrium at a variety of both the initial concentration of the solution and the temperature of the frozen layer. The expressions of the thermal conductivity of the frozen layer were determined. It was found that the thermal conductivity of the dendritic ice layer was favorably assessed with the Lichteneker's model by introducing the solid fraction under an assumption of the equililbrium within the range of parameters examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500725
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal conductivity of carbon tetrachloride in the temperature range 310 to 364 K at pressures up to 0.22 GPa (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 427-438 
    Details
    ISSN: 1572-9567
    Keywords: carbon tetrachloride ; hard-sphere theory ; liquid ; self-diffusion coefficient ; thermal conductivity ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper reports new measurements of the thermal conductivity of carbon tetrachloride in the temperature range 310 to 364 K at pressures up to 0.22 GPa. The experimental data have an estimated uncertainty to ±0.3%. The hard-sphere theory of transport in dense fluids is employed to formulate a correlation scheme for the thermal conductivity as a function of density. A single equation represents the dependence of the thermal conductivity on density for all isotherms, the isotherms being distinguished by a characteristic value of the molar volume. It is shown that earlier measurements of the viscosity and self-diffusion coefficient of carbon tetrachloride may be represented in a similar fashion using consistent values of the characteristic volume.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00508888
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  • 6
    Electronic Resource
    Electronic Resource
    The thermal conductivity of ethylene and ethane (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 481-500 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503148
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal conductivity ofn-Tetracosan around the liquid-liquid transition temperatureT u (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 603-606 
    Details
    ISSN: 1435-1536
    Keywords: n-Tetracosan ; thermal conductivity ; transient hot strip ; liquid-liquid transition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Forn-Tetracosan the temperature dependence of the thermal conductivity has been determined between 52 °C and 150 °C by the transient hot strip method. A decreasing thermal conductivity is followed by a constant one forT≳100 °C. The change in slope can be well estimated by using data of Brillouin scattering and specific volume measurements thus confirming the existence of theT u -phenomenon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421896
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal Properties of Polycrystalline ZnIn2Se4 (2000)
    Springer
    Journal of thermal analysis and calorimetry 59 (2000), S. 971-976 
    Details
    ISSN: 1572-8943
    Keywords: heat capacity ; polycrystalline ZnIn2Se4 ; thermal conductivity ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A pulse method was used to measure the thermal conductivity, specific heat capacity C p and thermal diffusivityξ of polycrystalline ZnIn2Se4 in the temperature range 300–600 K. The temperature dependence of λ, C p and ξ demonstrated a light decrease for this material in the temperature range 300–600 K, indicating that there is not a significant change in the structure in this temperature range; this was confirmed by DTA measurements. The results showed that the mechanism of heat transfer is due mainly to phonons; the contributions of electrons and dipoles are very small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010194829872
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  • 9
    Electronic Resource
    Electronic Resource
    Thermal Conductivity of 2223 BSCCO Superconductor–Polyethylene Glycol Composites Between 20 and 300 K (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 417-422 
    Details
    ISSN: 1572-9605
    Keywords: (Bi,Pb)2223-PEG composites ; thermal conductivity ; polyethylene glycol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Thermal conductivity measurements have been taken between 20 and 300 K on composites prepared from polyethylene glycol (PEG) containing various amounts of superconducting (Bi,Pb)2223 powder. The nature of temperature variation of thermal conductivity (λC) of the composites and its magnitude depend strongly on the volume concentration of the high-temperature superconductor (HTSC) filler present in the material. The results have been discussed in the light of models known for polymer–metal powder composites. It is shown that for composites with 2223 powder content 〈44 vol. %, the measured data can be accounted well with Hamilton–Crosser model, taking the sphericity factor into consideration. Failure of Hamilton–Crosser expression for composites with higher filler concentration is thought to be associated with direct contact between the superconducting grains, which shortcircuits the acoustic mismatch resistance in the composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007755125840
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of thermal conductivity from specific heat and thermal diffusivity measurements of plasma-sprayed cermets (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 455-466 
    Details
    ISSN: 1572-9567
    Keywords: aluminium/silicon carbide cermet ; aluminum/silicon eutectic ; plasma spray ; specific heat ; thermal conductivity ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivities of three plasma-sprayed cermets have been determined over the temperature range 23–630°C from the measurement of the specific heat, thermal diffusivity, and density. These cermets are mixtures of Al and SiC prepared by plasma spray deposition and are being considered for various applications in magnetic confinement fusion devices. The samples consisted of three compositions: 61 vol% Al/39 vol% SiC, 74vol% Al/26vol% SiC, and 83 vol% Al/17 vol% SiC. The specific heat was determined by differential scanning calorimetry through the Al melt transition up to 720°C, while the thermal diffusivity was determined using the laser flash technique up to 630°C. The linear thermal expansion was measured and used to correct the diffusivity and density values. The thermal diffusivity showed a significant increase after thermal cycling due to a reduction in the intergrain contact resistance, increasing from 0.4 to 0.6 cm2·−1 at 160°C. However, effective medium theory calculations indicated that the thermal conductivities of both the Al and the SiC were below the ideal defect-free limit even after high-temperature cycling. The specific heat measurements showed suppressed melting points in the plasmasprayed cermets. The 39 vol% SiC began a melt endotherm at 577°C, which peaked in the 640–650°C range depending on the sample thermal history. Chemical and X-ray diffraction analysis indicated the presence of free silicon in the cermet and in the SiC powder, which resulted in a eutectic Al/Si alloy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500169
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