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RESEARCH PAPERS

An Approximate Analysis for General Film Condensation Transients

[+] Author and Article Information
M. I. Flik, C. L. Tien

Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Heat Transfer 111(2), 511-517 (May 01, 1989) (7 pages) doi:10.1115/1.3250706 History: Received March 22, 1988; Online October 20, 2009

Abstract

This work presents a simple, powerful technique for analyzing a broad class of film condensation transients. The analysis shows that general film condensation transients are governed by the propagation of a kinematic wave along the film. Scaling arguments establish conditions for the use of quasi-steady profiles in the integral conservation equations. An elementary method permits simple solutions of the governing hyperbolic equation for time-step changes with arbitrary initial conditions. The application of this method yields closed-form solutions for step changes of body force, vapor shear, and wall temperature for a laminar film and for step changes of body force and wall temperature for a film within a porous medium. These approximate results agree excellently with numerical solutions of the complete boundary-layer equations. This technique has applications to a wide class of film condensation transients and to film boiling and convective vaporization transients.

Copyright © 1989 by ASME
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