Calculation of the Influence of Density on the Thermal Conductivity of Gaseous Mixtures

The scheme for the prediction of the thermal conductivity of dense gas mixtures, proposed by Mason and his collaborators, is critically examined, for the first time, with respect to accurate experimental data for eight systems. The systems studied are binary monatomic mixtures of He Ar and Ne Ar; a ternary mixture, Ne Ar Kr; the mixtures He H2, He N2, Ne N2, and Ar N2, which involve one polyatomic component; and the mixture H2 D2 which has two polyatomic components. The experimental results used for the comparison refer to a temperature of 27.5°C and extend over the pressure range 0.6–12 MPa. — For binary and ternary systems whose components have molecular mass ratios in the range 1 – 2, the calculation scheme is found to predict the thermal conductivity with a deviation from the experimental data which does not exceed ± 0.8% even when the mixtures contain polyatomic components. However, for mixtures where the molecular mass ratio is larger, the agreement is significantly poorer and deviations amounting to as much as 2.5% are observed. These larger deviations are attributed to the inadequacy of the first-order kinetic theory formulae upon which the prediction scheme is based. Ein von Mason und Mitarbeitern vorgeschlagenes Schema zur Bestimmung der Warmeleitfahigkeit dichter Gasgemische wird hier erstmalig einem kritischen Vergleich mit genauen Mesergebnissen fur acht Systeme unterzogen. Die untersuchten Systeme sind binare einatomige Gemische von He Ar und Ne Ar, ein ternares Gemisch von Ne Ar Kr, die Gemische He H2, He N2 und Ar N2, welche eine mehratomige Komponente enthalten, und das Gemisch H2 D2 von zwei mehratomigen Komponenten. Die fur den Vergleich herangezogenen experimentellen Resultaten gelten fur eine Temperatur von 27,5°C und Drucke zwischen 0,6 und 12 MPa. — Fur binare und ternare Systeme, deren Komponenten Molekulmassenverhaltnisse im Bereiche 1 – 2 besitzen, weichen die Vorhersagen des Berechnungsschemas nicht mehr als ± 0,8% von den experimentellen Werten ab, auch dann nicht, wenn die Gemische mehratomige Komponenten enthalten. Fur Gemische mit groseren Molekulmassenverhaltnissen ergibt sich jedoch eine bedeutend schlechtere Ubereinstimmung, wobei Abweichungen bis zu 2,5% beobachtet werden. Diese groseren Abweichungen werden den Unvollkommenheit der Formeln der ersten Annaherung zugeschrieben, auf denen das Berechnungsschema beruht.

[1]  J. Kestin,et al.  Thermal conductivity of some mixtures of monatomic gases at room temperature and at pressures up to 15 MPa , 1979 .

[2]  J. Kestin,et al.  Thermal conductivity of N2, CH4 and CO2 at room temperature and at pressures up to 35 MPa , 1979 .

[3]  S. Sandler,et al.  On the viscosity and thermal conductivity of dense gases , 1979 .

[4]  R. Dipippo,et al.  Composition dependence of the thermal conductivity of dense gas mixtures , 1978 .

[5]  J. Toennies,et al.  Determination of the H2-H2 potential from absolute integral cross section measurements , 1974 .

[6]  M. Ernst,et al.  THE MODIFIED ENSKOG EQUATION FOR MIXTURES , 1973 .

[7]  W. Kutzelnigg,et al.  Interaction potential for He/H2 including the region of the van der waals minimum , 1973 .

[8]  J. Kestin,et al.  Viscosity of the Binary Gaseous Mixtures of Nitrogen with Argon and Krypton , 1972 .

[9]  J. Kestin,et al.  Viscosity of the Binary Gaseous Mixtures He–Ne and Ne–N2 in the Temperature Range 25–700°C , 1972 .

[10]  J. Kestin,et al.  Viscosity of the Binary Gaseous Mixture Neon‐Krypton , 1972 .

[11]  J. Kestin,et al.  Viscosity of the Binary Gaseous Mixture Helium‐Nitrogen , 1972 .

[12]  J. Kestin,et al.  An extended law of corresponding states for the equilibrium and transport properties of the noble gases , 1972 .

[13]  K. Gubbins,et al.  Kinetic Theory of Multicomponent Dense Fluid Mixtures of Rigid Spheres , 1971 .

[14]  Joseph Kestin,et al.  Viscosity, Thermal Conductivity, and Diffusion Coefficient of Ar–Ne and Ar–Kr Gaseous Mixtures in the Temperature Range 25–700°C , 1970 .

[15]  Joseph Kestin,et al.  Viscosity and Diffusion Coefficient of Six Binary Mixtures , 1968 .

[16]  Edward A. Mason,et al.  Heat Conductivity of Polyatomic and Polar Gases and Gas Mixtures , 1965 .

[17]  J. Kestin,et al.  Project SQUID: The Viscosity of the Isotopes of Hydrogen and Their Intermolecular Force Potentials , 1963 .