A Study of Bubble Departure in Forced-Convection Boiling

Autor:	R. Moissis, A. Spyridonos, N. Koumoutsos
Rok vydání:	1968
Předmět:	Physics::Fluid Dynamics Materials science Mechanics of Materials Mechanical Engineering Boiling Bubble General Materials Science Mechanics Condensed Matter Physics Nucleate boiling Forced convection
Zdroj:	Journal of Heat Transfer. 90:223-230
ISSN:	1528-8943 0022-1481
DOI:	10.1115/1.3597483
Popis:	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.
Databáze:	OpenAIRE
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