The present study outlines a methodology for modeling instantaneous unsteady film condensation of vapor on a vertical flat wall. Both analytical and numerical solutions of the problem were obtained and compared with each other. Time variation of the thickness of the condensate film, velocity, and temperature profiles in the film as well as the friction and heat transfer coefficients were analyzed. At unsteady film condensation of vapor, a decrease in the heat transfer coefficient and simultaneous increase in the friction coefficient with time were observed. As a result, the Reynolds analogy is violated in the unsteady mode. The value of the parameter characterizing the time necessary for the unsteady film condensation of vapor to reach the steady state was obtained.
Heat Transfer and Fluid Flow During Instantaneous Unsteady Condensation
Journal of Thermophysics and Heat Transfer ; 35 , 2 ; 279-287
2020-08-18
9 pages
Article (Journal)
Electronic Resource
English
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