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Surface-tension-driven Bénard convection in small containers

Published online by Cambridge University Press:  26 April 2006

E. L. Koschmieder  and
S. A. Prahl
E. L. Koschmieder
Affiliation:
College of Engineering, The University of Texas at Austin, Austin, TX 78712, USA
S. A. Prahl
Affiliation:
College of Engineering, The University of Texas at Austin, Austin, TX 78712, USA
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Abstract

The onset and the form of surface-tension-driven convection in three different small circular and one small square container has been studied experimentally. In the smallest circular container, with increasing aspect ratio, the pattern consisted of first a circular roll and then segments of a circle outlined by different numbers of azimuthal nodal lines, with up to six segments. Simple solutions in the square container were the one-cellular pattern and a pattern consisting of four square cells. Unexpected solutions formed when the number of the cells in the square container was not a square number. When the aspect ratio permitted two cells, two triangular cells were observed. With space for three cells, one square cell and two wedge-shaped cells formed. The onset of convection in all fluid layers was characterized by a steep increase of the critical Marangoni number with decreasing aspect ratio.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 215 , June 1990 , pp. 571 - 583
Copyright
© 1990 Cambridge University Press

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