Transport Properties of Dense Media. I. Thermal Diffusion in Isotopic Mixtures of Gases

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Abstract
Based on Meixner's thermodynamics for irreversible processes, and the work of Haase, an equation for the thermal diffusion ratio α, which can be evaluated from the equation of state, is presented. Using van der Waals' equation, α's are calculated in the critical region and compared with data for ethane-xenon. The equation reproduces all the essential features of the experimental results. Calculations made for a mixture of isotopes indicate that the effect of pressure on α cannot be attributed to selective clustering.