Heat Transfer Research

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Study of Unsteady Evaporation-Condensation Processes on the Surface by the Methods of the Molecular-Kinetic Theory

A. P. Kryukov
Moscow Power Engineering Institute, Russian Academy of Sciences, Moscow, Russia

Irina N. Shishkova
Low Temperature Departments, Centre of High Technologies, Moscow Power Engineering Institute, Krasnokazarmennaya, 14, Moscow 111250, Russia

A. K. Yastrebov
Moscow Power Engineering Institute, Moscow, Russia

ABSTRACT

The process of unsteady evaporation have been studied by direct numerical solution of the kinetic Boltzmann equation. The results of calculation of vapor flows are illustrated by dependences of density on coordinate at different time moments. It has been shown that a system of waves appears in the vapor phase. The first wave moves with supersonic velocity and can be described by the Rankine-Hugoniot correlation. Calculations have been made for initial data of Onishi and Tsuji who studied the unsteady evaporation-condensation process by solving the model BGK-type equation. Also Furukawa and Murakami experimental investigation of unsteady superfluid-helium evaporation has been modeled. The solution presented agrees with the results of these papers.