Ab Initio Values of the Gas Transport Properties of Hydrogen Isotopologues and Helium–Hydrogen Mixtures at Low Density

Abstract

We employed the classical kinetic theory to calculate transport properties as a function of temperature for hydrogen isotopologues and helium−hydrogen mixtures. The viscosity, thermal conductivity, diffusion coefficient, and thermal diffusion factor were computed at low density and over a wide temperature range from 298 to 2000 K. The calculation utilized the spherically symmetric versions of the latest ab initio potentials for the interactions of the like and unlike gas molecules. The computed values are generally consistent with the limited experimental data for HD, 4 He−H 2 , 4 He− D 2 , 4 He−HD, 3 He−H 2 , 3 He−D 2 , H 2 −HD, and D 2 −HD. Our results provide reliable transport property data for the considered species at temperatures where experimental information is absent.