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Evaporation of volatile-liquid lenses floating on an immiscible-liquid surface: effects of the surface age and fluid purities in n-pentane/water system

Published online by Cambridge University Press:  21 April 2006

T. Nosoko ,
T. Ohyama  and
Y. H. Mori
T. Nosoko
Affiliation:
Department of Mechanical Engineering, Keio University, Yokohama 223, Japan
T. Ohyama
Affiliation:
Department of Mechanical Engineering, Keio University, Yokohama 223, Japan
Y. H. Mori
Affiliation:
Department of Mechanical Engineering, Keio University, Yokohama 223, Japan
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Abstract

This paper describes a fundamental study of evaporation of volatile-liquid lenses due to the heat supply from the substrate of an immiscible, less-volatile liquid under the atmosphere of the common vapours of the two fluid substances. Experiments were performed with single n-pentane lenses placed on the surface of an otherwise quiescent pool of water. The behaviour of each lens throughout its life was observed in detail using laser shadowgraphy. It was found that the time required for complete evaporation of each lens and the behaviour of the lenses change, in a peculiar but rather regular way, with the age of the water surface. This ageing effect is more significant when fluids of higher purities are used, and it is thought to be due to the quantity of contaminants at the surface increasing with its age.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 161 , December 1985 , pp. 329 - 346
Copyright
© 1985 Cambridge University Press

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