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An experimental study of oscillatory convection in liquid gallium

Published online by Cambridge University Press:  26 April 2006

Manfred G. Braunsfurth  and
T. Mullin
Manfred G. Braunsfurth
Affiliation:
Department of Atmospheric Oceanic and Planetary Physics, Oxford University, Parks Road, Oxford, OX1 3PU, UK
T. Mullin
Affiliation:
Department of Atmospheric Oceanic and Planetary Physics, Oxford University, Parks Road, Oxford, OX1 3PU, UK
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Abstract

Results are presented of an experimental study of the onset of time-dependent flows in a sample of liquid gallium subjected to a horizontal temperature gradient. The primary control parameter is the Grashof number which is set by the temperature difference. However, we have also taken the novel approach of varying the Prandtl number in a systematic way using the applied mean temperature. This has uncovered some surprising new dynamical states. Furthermore, the interaction between competing oscillatory flows has produced interesting dynamical behaviour including secondary Hopf bifurcations where both the frequency and amplitude grow from zero as the critical point is passed.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 327 , 25 November 1996 , pp. 199 - 219
Copyright
© 1996 Cambridge University Press

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