Viscosity and Thermal Conductivity of Moderately Dense Gas Mixtures

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Abstract
The paper presents a simple, semitheoretical expression for the initial density dependence of the viscosity and thermal conductivity of gaseous mixtures in terms of the appropriate properties of the pure components and of their interaction quantities. The derivation is based on Enskog's theory of dense gases and provides us with an equation in which the composition dependence of the linear factor in the density expansion is explicit. The interaction quantities are directly related to those of the mixture extrapolated to zero density and to a universal function valid for all gases. The reliability of the formulation is assessed with respect to the viscosity of several binary mixtures. It is found that the calculated viscosities of binary mixtures agree with the experimental data with a precision which is comparable to that of the most precise measurements. The method developed in the paper allows us to calculate the viscosity and thermal conductivity of moderately dense binary and multicomponent mixtures of gases. The evaluation of the respective properties in the limit of zero density has been made possible by the law of corresponding states developed by Kestin, Ro, and Wakeham.