Local Film Thickness During Transient Voiding of a Liquid-Filled Channel

[+] Author and Article Information
M. R. Özgü

Homer Research Laboratories, Bethlehem Steel Corp., Bethlehem, Pa.

J. C. Chen

Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, Pa.

J. Heat Transfer 98(2), 159-165 (May 01, 1976) (7 pages) doi:10.1115/1.3450512 History: Received March 15, 1976; Online August 11, 2010


Using a recently developed method, measurements were obtained of local film thicknesses during transient voiding of a liquid-filled channel. The liquid film remaining on the channel walls was found to vary in thickness over a range of 0.015–0.15 times channel diameter. In a Lagrangian coordinate system, the film thickness at a fixed distance from the head of the void was found to increase with increasing void acceleration. In an Eulerian system, the film thickness at a fixed location on the channel wall was found to decrease with increasing acceleration, when measured at the same time after passage of the head of the void. In all cases, film thickness monotonically decreased with increasing distance from the head of the void. Complete film breakage (dryout) was not observed in these experiments. These experimental measurements of local film thicknesses during transient voiding conditions are pertinent to thermal analyses for reactor safety studies.

Copyright © 1976 by ASME
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