A Study of Bubble Departure in Forced-Convection Boiling

[+] Author and Article Information
N. Koumoutsos

Nuclear Research Center “Democritus” and National Technical University, Athens, Greece

R. Moissis

Kelvinator Hellas Inc., Athens, Greece

A. Spyridonos

Nuclear Research Center “Democritus,” Athens, Greece

J. Heat Transfer 90(2), 223-230 (May 01, 1968) (8 pages) doi:10.1115/1.3597483 History: Received June 01, 1966; Revised February 06, 1967; Online August 25, 2011


Visual observations in a boiling liquid flow indicate that, as the flow velocity is increased, the size of bubbles leaving the heating surface decreases. The purpose of this investigation is to arrive at a criterion for bubble departure in forced-convection nucleate boiling. Photographic studies indicate that a little before departure a “neck” is formed joining the almost spherical bubble to the heating surface. From a consideration of the hydrodynamic stability of the bubble-and-neck model, the departure-size-to-velocity relationship may be predicted. Measured departure radii in a forced-convection boiling water system taken by means of high-speed photography are satisfactorily correlated with the results derived analytically.

Copyright © 1968 by ASME
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