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Thermocapillary and oscillatory-shear instabilities in a layer of liquid with a deformable surface

Published online by Cambridge University Press:  10 April 1998

A. C. OR  and
R. E. KELLY
A. C. OR
Affiliation:
Department of Mechanical, Aerospace and Nuclear Engineering, University of California, Los Angeles, CA 90095-1597, USA
R. E. KELLY
Affiliation:
Department of Mechanical, Aerospace and Nuclear Engineering, University of California, Los Angeles, CA 90095-1597, USA
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Abstract

The thermocapillary and shear-induced instabilities of a thin heated layer of liquid bounded from the top by a deformable free surface and at the bottom by a horizontally oscillating plate are studied for both Earth-bound and microgravity conditions. Finite-wavelength thermocapillary convection can be stabilized very significantly by the oscillatory shear, whereas shear-induced instabilities are greatly stabilized if the Marangoni number is negative. For long-wavelength thermocapillary convection, oscillatory shear can stabilize or destabilize the basic state, depending primarily on the imposed forcing frequency. With microgravity, significant stabilization of the dominant long-wavelength convection can be achieved by carefully selecting the imposed frequency.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 360 , 10 April 1998 , pp. 21 - 39
Copyright
© 1998 Cambridge University Press

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