A Kinetic Approach to Non-linear Condensation and/or Evaporation Processes

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This paper concerns with the non-linear steady condensation and/or evaporation processes of pure vapor flowing along an infinitely plane wall. The aim is to analyze these processes by means of an extended two-stream moment method for a wide variety of flow parameters, and to clarify the dependence of the processes on various flow parameters with or without mean parallel velocity. The condensation rate depends, in general, on the ambient, uniform flow parameters (density, pressure or temperature, and mean parallel velocity), while for smaller condensation rates it depends on the pressure alone. The evaporation rate depends on the ambient pressure alone for any rate and the solution is achieved only for the cases without the mean parallel velocity. As regards the effect of the mean parallel velocity on the condensation rate, the rate indicates pronounced decrease with increasing the mean parallel velocity. For the Couette flow, the effect of the mass flux on the flow behavior is also clarified.
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