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  • 1
    Electronic Resource
    Electronic Resource
    Non-asymptotic critical behavior of the transport properties of fluids (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 7482-7501 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We extend the application of the mode-coupling theory for the dynamics of critical fluctuations in fluids into the non-asymptotic critical region. An approximate solution of the mode-coupling equations yields a set of representative equations for the thermal conductivity and the viscosity of one-component fluids which incorporates the crossover from asymptotic singular behavior near the critical point to the regular behavior of these transport properties far away from the critical point. The equations for the critical enhancements of the thermal conductivity and the viscosity depend on the background transport properties of the fluid, the equilibrium thermodynamic properties of the fluid, and one fluid-dependent wave-number cutoff qD, which is indicative of the crossover length scale. We compare our crossover model with experimental data for the thermal diffusivity, the thermal conductivity, and the viscosity of carbon dioxide and ethane. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470718
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  • 2
    Electronic Resource
    Electronic Resource
    The thermal conductivity of argon in the critical region (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 6944-6963 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have measured the thermal conductivity of argon at temperatures from 302 K down to 150.8 K and at densities up to 25 mol L−1. The data were obtained with a steady-state method and we employed a guarded parallel-plate apparatus designed especially for investigating the thermal conductivity of fluids in the critical region. To interpret the data in the critical region a scaled crossover equation of state for argon in the critical region has been constructed. Equations for the thermal conductivity and viscosity of argon as a function of density and temperature are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468322
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  • 3
    Electronic Resource
    Electronic Resource
    Erratum: The transport properties of fluid mixtures near the vapor–liquid critical line [J. Chem. Phys. 104, 3026 (1996)] (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 438-438 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474124
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  • 4
    Electronic Resource
    Electronic Resource
    The transport properties of fluid mixtures near the vapor–liquid critical line (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 3026-3047 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We apply the mode-coupling theory for the dynamics of critical fluctuations to binary fluid mixtures near the vapor–liquid critical line and derive a set of coupled equations for the mode-coupling contributions to the diffusion coefficients of the relevant hydrodynamic modes. An approximate solution of the mode-coupling integrals yields representative equations for the effects of the critical fluctuations on the thermal conductivity, the viscosity, the mutual diffusivity and the thermal-diffusion coefficient, which are valid not only in the asymptotic critical region but also describe the crossover to regular behavior far away from the critical line. The "crossover'' functions depend on the thermodynamic properties of the mixtures, background values of all the transport coefficients and two concentration-dependent cutoff wave numbers. We compare the proposed crossover model with experimental thermal-conductivity data for mixtures of carbon dioxide and ethane in the critical region and find good agreement between theory and experiment. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471070
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  • 5
    Electronic Resource
    Electronic Resource
    A parametric model for the global thermodynamic behavior of fluids in the critical region (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 2705-2717 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The asymptotic thermodynamic behavior of fluids near the critical point is described by scaling laws with universal scaling functions that can be represented by parametric equations. In this paper, we derive a more general parametric model that incorporates the crossover from singular thermodynamic behavior near the critical point to regular classical thermodynamic behavior far away from the critical point. Using ethane as an example, we show that such a parametric crossover model yields an accurate representation of the thermodynamic properties of fluids in a large region around the critical point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463060
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  • 6
    Electronic Resource
    Electronic Resource
    Macroscopic symmetry group describes Josephson tunneling in twinned crystals (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 483-488 
    Details
    ISSN: 1573-7357
    Keywords: 74.20.De ; 74-50.+r ; 74.72.Bk ; 74.62.Bf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A macroscopic symmetry group describing the superconducting state of an orthorhombically twinned crystal of YBCO is introduced. This macroscopic symmetry group is different for different symmetries of twin boundaries. Josephson tunneling experiments performed on twinned crystals of YBCO determine this macroscopic symmetry group and hence determine the twin boundary symmetry (but do not experimentally determine whether the microscopic order parameter is primarily d- or s-wave). A consequence of the odd-symmetry twin boundaries in YBCO is the stability of 1/2 Φo vortices at the intersection of a twin boundary and certain grain boundaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768432
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  • 7
    Electronic Resource
    Electronic Resource
    The transport properties of ethane. II. Thermal conductivity (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 33-66 
    Details
    ISSN: 1572-9567
    Keywords: ethane ; n-alkanes ; transport properties ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new representation of the thermal conductivity of ethane is presented. The representative equations are based upon a body of experimental data that have been critically assessed for internal consistency and for agreement with theory in the zero-density limit and in the critical region. The representation extends over the temperature range from 100 K to the critical temperature in the liquid phase and from 225 K to the critical temperature in the vapor phase. In the supercritical region the temperature range extends to 1000 K for pressures up to 1 MPa and to 625 K for pressures up to 70 MPa. The ascribed accuracy of the representation varies according to the thermodynamic state from ±2% for the thermal conductivity of the dilute gas near room temperature to ±5% for the thermal conductivity at high pressures and temperatures. Tables of the thermal conductivity, generated by the relevant equations, at selected temperatures and pressures and along the saturation line are also provided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439246
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  • 8
    Electronic Resource
    Electronic Resource
    Transport properties of 1,1,1,2-tetrafluoroethane (R134a) (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 951-988 
    Details
    ISSN: 1572-9567
    Keywords: 1,1,1,2-tetrafluoroethane ; correlation ; critical region ; equation of state ; HFC-134a ; R134a ; thermal conductivity ; transport properties ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New equations for the thermal conductivity and the viscosity of R134a that are valid in a wide range of pressures and temperatures are presented. They were obtained through a theoretically based, critical evaluation of the available experimental data, which showed considerable inconsistencies between data sets, in particular in the vapor phase. In the critical region the observed enhancement in the thermal conductivity is well represented by a crossover model for the transport properties of fluids. Since thermodynamic properties enter into the calculation of the critical enhancement of the transport properties, a new fundamental equation for the critical region was developed also.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00502117
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  • 9
    Electronic Resource
    Electronic Resource
    The transport properties of ethane. I. Viscosity (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 1-31 
    Details
    ISSN: 1572-9567
    Keywords: ethane ; n-alkanes ; transport properties ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new representation of the viscosity of ethane is presented. The representative equations are based upon a body of experimental data that have been critically assessed for internal consistency and for agreement with theory in the zero-density limit, vapor phase, and critical region. The representation extends over the temperature range from 100 K to the critical temperature in the liquid phase and from 200 K to the critical temperature in the vapor phase. In the supercritical region, the temperature range extends to 1000 K for pressures up to 2 MPa and to 500 K for pressures up to 60 MPa. The ascribed accuracy of the representation varies according to the thermodynamic state from ±0.5 % for the viscosity of the dilute gas near room temperature to ±3.0% for the viscosity at high pressures and temperatures. Tables of the viscosity, generated by the relevant equations, at selected temperatures and pressures and along the saturation line, are also provided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439245
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  • 10
    Electronic Resource
    Electronic Resource
    Transport properties of fluid mixtures in the critical region (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 1241-1249 
    Details
    ISSN: 1572-9567
    Keywords: binary fluid mixtures ; critical phenomena ; crossover model ; mutual diffusivity ; plait point ; transport properties ; thermal conductivity ; thermal diffusion coefficient ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Transport properties of fluid mixtures exhibit anomalous behavior near the vapor-liquid critical line. These anomalies are a result of long-range fluctuations in the system in the vicinity of a critical point. We use mode-coupling theory to describe the critical enhancements of the thermal conductivity, the viscosity, the mutual diffusivity, and the thermal-diffusion coefficients of binary mixtures. The resulting expressions not only are valid in the asymptotic critical region but also describe the crossover to regular behavior far away from a critical point. The crossover functions depend on the thermodynamic properties of the mixtures, background values of all transport coefficients, and two concentration-dependent cutoff wave numbers. We compare the proposed crossover model with experimental thermal-conductivity data for mixtures of carbon dioxide and ethane in the critical region and find good agreement between theory and experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01458832
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