Condensation on a Downward-facing Horizontal Rippled Surface

[+] Author and Article Information
Avram Markowitz

Raytheon Co., Bedford, Mass.

B. B. Mikic

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Mass.

A. E. Bergles

School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Ga.

J. Heat Transfer 94(3), 315-320 (Aug 01, 1972) (6 pages) doi:10.1115/1.3449939 History: Received March 29, 1971; Online August 11, 2010


An analytical investigation is presented for film condensation on a downward-facing horizontal doubly rippled surface. Small undulations having constant radius of curvature are combined with larger cylindrical grooves designed to aid condensate runoff. A direct expression for the condensate film thickness at the top of an undulation crest, as well as on a small-diameter horizontal cylinder, is derived. An upper-bound expression for the condensation rate on the rippled surface is then obtained which predicts that the condensation rate will be five times the rate attainable on a flat horizontal surface of the same projected area. This analytical expression is compared with experimental data.

Copyright © 1972 by ASME
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