Abstract
A linearized kinetic model equation with an Oseen-like approximation was applied to study the moderately strong unsteady evaporation and condensation problems. Asymptotic solutions were obtained for the weak (linearized) evaporation and condensation problems, disjoining the fluid dynamic equation with the Oseen approximation from the Knudsen layer equation. The asymptotic solution yielded correct features of the flow due to evaporation or condensation. The kinetic model equation was further applied to study the moderately strong evaporation and condensation problems. The results showed good agreement with the previous results derived from the nonlinear treatments and confirmed that the conventional slip flow theory is applicable for studying the moderately strong evaporation and condensation problems.
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