Effect of Uniform Suction on Laminar Film Condensation on a Porous Vertical Wall

[+] Author and Article Information
Ji Wu Yang

Department of Mechanical Engineering, State University of New York at Buffalo, Buffalo, N. Y.

J. Heat Transfer 92(2), 252-256 (May 01, 1970) (5 pages) doi:10.1115/1.3449657 History: Received May 14, 1969; Online August 11, 2010


The problem of film condensation on a porous wall has been solved by a boundary layer treatment. A dimensionless suction velocity parameter β, which is proportional to the uniform suction velocity vw and 1/4 th the power of longitudinal coordinate (x1/4 ), is defined to characterize the process. The results are restricted to small values of β, as the solutions are given by power series expansion in β. The effects of uniform suction on heat transfer, condensation rate, film thickness, and velocity and temperature profiles are demonstrated through various examples. In general, uniform suction causes a substantial increase of heat transfer and condensation rate, especially at low subcooling and at high Prandtl numbers. The problem involves three governing parameters: subcooling, Prandtl number, and suction velocity. Comparison with the previous work of Jain and Bankoff is discussed.

Copyright © 1970 by ASME
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