Viscosities of binary gas mixtures at high temperatures

Abstract

The viscosities of He + Ar, Ar + Kr and CH₄+ CF₄ binary gas mixtures have been measured over the temperature range 293–1600 K using a capillary flow technique. The results are in good agreement with existing data both for the pure components (up to 1600 K) and for the inert gas mixtures (up to 1000 K). They have been analyzed in terms of the so-called interaction viscosity, η₁₂, which is characteristic of the unlike pair interactions and essentially independent of composition. The application of this quantity of the estimation of other transport properties for gas mixtures and to the direct determination of pair potential energy functions for unlike molecules is discussed.