ENHANCEMENT OF HEAT TRANSFER BY THERMOCAPILLARY CONVECTION AROUND BUBBLES -A NUMERICAL STUDY
Authors:
- 1 May 1994
- journal article
- research article
- Published by Taylor & Francis in Numerical Heat Transfer, Part A: Applications
- Vol. 25 (5) , 501-518
Abstract
For a gas bubble floating in a liquid-filled rectangular enclosure, the effect of thermocapU-lary convection on fluid flow and heat transfer is studied in a cross section with a two-dimensional model. A transient finite difference scheme is applied for the numerical calculations. For a fluid with Pr = 1.93, the overall heat transfer in the liquid is presented for selected configurations in terms of the dimensionless numbers Nu and Ma. Contrary to the common view that an enclosed gas volume would reduce the heat transfer due to its insulating behavior, the energy transport is rather augmented by the thermocapillary convection acting on the free surface. For higher Marangoni numbers, oscillatory flow behavior occurs.Keywords
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