The Effect of Obstacles on a Liquid Film

[+] Author and Article Information
B. S. Shiralkar, R. T. Lahey

General Electric Company, Atomic Power Equipment Department, San Jose, Calif.

J. Heat Transfer 95(4), 528-533 (Nov 01, 1973) (6 pages) doi:10.1115/1.3450101 History: Revised October 20, 1972; Received April 20, 1973; Online August 11, 2010


It has been observed in simulated nuclear reactor critical heat flux (CHF) experiments that CHF tends to occur upstream of flow obstructions, such as grid type spacers. An experimental program was conducted to quantify the effect of various obstacles on a liquid film. Although this was an adiabatic (air-water) study, a phenomenological mechanism causing dryout was observed. A simplified analysis of the observed phenomena has indicated that, above a critical Weber number, the ratio of the momenta of the liquid and vapor streams is the important parameter in determining when an upstream dry patch will form.

Copyright © 1973 by ASME
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