Effect of Precursory Cooling on Falling-Film Rewetting

[+] Author and Article Information
K. H. Sun, G. E. Dix

Nuclear Energy Division, General Electric Co., San Jose, Calif.

C. L. Tien

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

J. Heat Transfer 97(3), 360-365 (Aug 01, 1975) (6 pages) doi:10.1115/1.3450379 History: Received April 02, 1975; Online August 11, 2010


An analytical model for falling-film wetting of a hot surface has been developed to account for the effect of cooling by droplet-vapor mixture in the region immediately ahead of the wet front. The effect of precursory cooling is characterized by a heat transfer coefficient decaying exponentially from the wet front. Based on the present model, the wet front velocity, as well as the temperature profile along a thin slab, can be calculated. It is demonstrated that the precursory cooling can increase the wet front velocity by an order of magnitude. Existing experimental data with variable flow rates at atmospheric pressure are shown to be successfully correlated by the present model.

Copyright © 1975 by ASME
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