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On the thermocapillary motion of partially engulfed compound drops

Published online by Cambridge University Press:  10 May 2009

L. ROSENFELD ,
O. M. LAVRENTEVA  and
A. NIR
L. ROSENFELD
Affiliation:
Chemical Engineering Department, Technion, Haifa 32000, Israel
O. M. LAVRENTEVA
Affiliation:
Chemical Engineering Department, Technion, Haifa 32000, Israel
A. NIR*
Affiliation:
Chemical Engineering Department, Technion, Haifa 32000, Israel
*
†Email address for correspondence: avinir@tx.technion.ac.il
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Abstract

In this work the thermocapillary-induced motion of partially engulfed compound drops is considered. This phenomenon occurs in many natural and technological processes in which heat is exchanged between such hybrid drops and the medium around them through the interfaces. Two types of thermal fields and the resulting motions are studied; flow induced by an external temperature gradient and spontaneous thermocapillary motion. For the first flow type, it was found that, in general, the motion is induced in the direction of the temperature gradient. However, under certain physical conditions and drops' configuration a motion against the temperature gradient may be observed. In the second case, spontaneous thermocapillary motion, the compound drop moves due to surface tension gradients which result from the geometric non-uniformity of the system. Results are presented for several parameters such as configuration of the compound drop, viscosity, thermal conductivity ratio, the dependence of the various interfacial tensions on temperature and the volume ratio of the phases within the drop.

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Type
Papers
Information
Journal of Fluid Mechanics , Volume 626 , 10 May 2009 , pp. 263 - 289
Copyright
Copyright © Cambridge University Press 2009

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