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The wavenumbers of supercritical surface-tension-driven Bénard convection

Published online by Cambridge University Press:  26 April 2006

E. L. Koschmieder  and
D. W. Switzer
E. L. Koschmieder
Affiliation:
College of Engineering and I. Prigogine Center for Statistical Mechanics. The University of Texas at Austin, Austin, TX 78712, USA
D. W. Switzer
Affiliation:
College of Engineering and I. Prigogine Center for Statistical Mechanics. The University of Texas at Austin, Austin, TX 78712, USA
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Abstract

The cell size or the wavenumbers of supercritical hexagonal convection cells in primarily surface-tension-driven convection on a uniformly heated plate has been studied experimentally in thermal equilibrium in thin layers of silicone oil of large aspect ratio. It has been found that the cell size decreases with increased temperature difference in the slightly supercritical range, and that the cell size is unique within the experimental error. It has also been observed that the cell size reaches a minimum and begins to increase at larger temperature differences. This reversal of the rate of change of the wavenumber with temperature difference is attributed to influences of buoyancy on the fluid motion. The consequences of buoyancy have been tested with three fluid layers of different depth.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 240 , July 1992 , pp. 533 - 548
Copyright
© 1992 Cambridge University Press

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