General expressions of thermal diffusion phenomena in a multi-component mixture given by Hirschfelder et al. and Chapman-Cowling were compared and authors revealed that (i) Chapman-Cowling defined a thermal diffusion factor, but Hirschfelder et al. did not the factor in the multi-component mixture, and (ii) Adopting the formalism outlined in the Hirschfelder theory, Monchick et al. introduced the thermal diffusion factor in multi-component mixture, but they did not define explicitly the thermal diffusion fa…
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