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Magnetohydrodynamic damping of convective flows in molten gallium

Published online by Cambridge University Press:  13 May 2003

B. HOF ,
A. JUEL  and
T. MULLIN
B. HOF
Affiliation:
Department of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
A. JUEL
Affiliation:
Department of Mathematics, The University of Manchester, Oxford Road, Manchester M13 9PL, UKajuel@maths.man.ac.uk
T. MULLIN
Affiliation:
Department of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
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Abstract

We report the results of an experimental study of magnetohydrodynamic damping of sidewall convection in a rectangular enclosure filled with gallium. In particular we investigate the suppression of convection when a steady magnetic field is applied separately in each of the three principal directions of the flow. The strongest damping of the steady flow is found for a vertical magnetic field, which is in agreement with theory. However, we observe that the application of a field transverse to the flow provides greater damping than a longitudinal one, which seems to contradict available theory. We provide a possible resolution of this apparent dichotomy in terms of the length scale of the experiment.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 482 , 10 May 2003 , pp. 163 - 179
Copyright
© 2003 Cambridge University Press

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