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International Heat Transfer Conference 5

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

EVAPORATION OF A DROPLET OF ONE LIQUID RISING THROUGH A SECOND IMMISCIBLE LIQUID. A NEW THEORY OF THE HEAT TRANSFER PROCESS

Hugh C. Simpson
Department of Thermodynamics and Mechanics of Fluids University of Strathclyde, Glasgow, Scotland, U.K.

George C. Beggs
Department of Thermodynamics and Mechanics of Fluids University of Strathclyde, Glasgow, Scotland, U.K.

M. Nazir
University of strathclyde, Glasgow, Scotland

DOI: 10.1615/IHTC5.910
pages 59-63

Abstract

For a butane droplet/bubble evaporating in brine, the bubble velocity is constant when interfacial tension is important, but increases as the square root of the equivalent diameter when interfacial tension is less important. Sloshing of residual liquid butane round the top internal surface of the bubble is thought to be related to be related to bubble strouhal frequency, implying that bubble oscillation is determined by vortex shedding into the wake. The evaporation rate, also related to bubble motion, is mainly determined by the thermal resistance of the sloshing liquid butane film, which gives a heat transfer coefficient varying as diameter ratio to the power of 1/6.

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