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A scheme has been proposed for approximating the complicated second and higher CHAPMAN-COWLING approximation formulae for the thermal diffusion factor of a binary gas mixture. Expressions have been reported for the second approximation and their accuracy investigated by performing numerical calculations for the systems Ar—Xe and He—Xe as a function of both temperature and composition. These formulae have been further simplified by expressing them in the ascending powers of M, the ratio of the molecular weight of the lighter component to the heavier component, and neglecting all those terms which explicitly posses the power of M greater than two. The two particular cases when either of the components is present in tracer amounts have also been investigated.

Simpler Formulae for the Chapman-Cowling Second Approximation to the Thermal Diffusion Factor of Binary Gas Mixtures