Evaporation, theory propagation

Consider a semi-infinite expanse of an initially uniform gas bounded by its plane condensed phase. Depending on the conditions of the gas and the condensed phase, condensation or evaporation will take place on the condensed phase the disturbance induced by their interaction will propagate in the gas and after a long time a steady condensation or evaporation flow will be established. The senior author (Y. S.) considered the problem on the basis of kinetic theory in Ref. 1 when condensation takes place. In Ref. 1 the behavior of the gas is analyzed numerically by a finite difference method for a large number of initial situations, from which the transient behavior to a final steady state is classified and the steady behavior, especially the relation satisfied among the parameters at infinity and on the condensed phase in a condensation flow, is clarified. 

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