A comparison between calculated and experimental transport coefficients of binary gaseous mixtures N2-He, Ne and Ar

Abstract

A large number of anisotropic potential energy surfaces for the N2-He, Ne and Ar systems have been examined using the infinite-order sudden approximation (IOSA) to test their usefulness in predicting transport properties as functions of temperature. In particular, the binary diffusion, shear viscosity and thermal conductivity coefficients have been considered in detail. Six N2-He potentials, eight N2-Ne potentials and seven N2-Ar potentials have been considered in this study. For each system, only one of each set of potentials considered was found to predict adequately all three transport coefficients. Of the three transport properties examined, the thermal conductivity is the most sensitive to anisotropy in the potential energy surface. The calculation of this property should, however, be carried out using dynamical methods that are more accurate than the IOSA for the calculation of purely inelastic cross sections.