Abstract
This paper is concerned with the theory of film condensation of vapor on a shock-tube endwall behind a reflected shock wave. One-dimensional gas dynamics equations, together with thermal equations for a liquid film and the endwall, are solved to the first approximation by the method of singular perturbation. An approximate equation of liquid film growth is derived in a simple explicit form. It is clarified that the equation agrees well with computational results with an error of about 3%. The present theory suggests that the condensation coefficient (sticking probability) of vapor should be measured during the time when the growth rate of the liquid film depends on the condensation coefficient. The time, which is called the transition time of condensation, is defined explicitly in a theoretical manner.
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