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Magnetohydrodynamic damping of oscillations in low-Prandtl-number convection

Published online by Cambridge University Press:  02 December 2005

B. HOF ,
A. JUEL  and
T. MULLIN
B. HOF
Affiliation:
School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
A. JUEL
Affiliation:
School of Mathematics, The University of Manchester, Oxford Road, Manchester M13 9EP, UK bjorn@reynolds.ph.man.ac.uk
T. MULLIN
Affiliation:
School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
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Abstract

We present the results of an experimental investigation of the effect of a magnetic field on the stability of convection in a liquid metal. A rectangular container of gallium is subjected to a horizontal temperature gradient and a uniform magnetic field is applied separately in three directions. The magnetic field suppresses the oscillation most effectively when it is applied in the vertical direction and is least efficient when applied in the direction of the temperature gradient. The critical temperature difference required for the onset of oscillations is found to scale exponentially with the magnitude of the magnetic field for all three orientations. Comparisons are made with available theory and qualitative differences are discussed.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 545 , 25 December 2005 , pp. 193 - 201
Copyright
© 2005 Cambridge University Press

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