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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

DESTABILIZATION OF FILM BOILING IN LIQUID-LIQUID SYSTEMS

Get access (open in a dialog) DOI: 10.1615/IHTC6.3930
pages 269-274

Abstract

Critical Weber numbers for contact of a volatile liquid drop falling onto a hot liquid surface have been previously reported. In this work the minimum approach distance is calculated by a creeping flow analysis to be ~ 10−3 - 10−4 cm, well above the interaction distance for London forces. Hence hydrodynamic stability considerations become important. Data are also presented for the neutral stability line of pentane drops in Leidenfrost boiling on a hot silicone oil surface upon a sudden pressure increase. A resonance model is presented for the hydrodynamic instability, in which the forcing frequency is derived from the nonlinear equation of motion of the drop. Reasonable agreement is obtained with the data. For poorly-wetting systems, as with most liquid metals, the hydrodynamic stability condition is necessary, but not sufficient, for collapse of the vapor film.