Abstract
Kihara's first approximation for isotopic thermal diffusion in gases, which is a simplification of the Chapman-Enskog approximation, is derived in a simple and intuitive manner; the derivation elucidates the physical meaning of the approximation. The second approximation in this scheme is also given; it indicates the high accuracy of the first approximation.
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References
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Kihara, T. The Chapman-Enskog and Kihara approximations for isotopic thermal diffusion in gases. J Stat Phys 13, 137–143 (1975). https://doi.org/10.1007/BF01221374
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DOI: https://doi.org/10.1007/BF01221374