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Hydromagnetic surface waves with alternating magnetic fields

Published online by Cambridge University Press:  28 March 2006

Michael J. Schaffer
Michael J. Schaffer
Affiliation:
Department of Electrical Engineering, Massachusetts Institute of Technology, Cambridge, MassachusettsPresent address: Department of Physics, Escuela de Ingenieros Industrials, Universidad Tecnica del Estado, Santiago, Chile.
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Abstract

Hydromagnetic surface waves propagating on the surface of a finitely conducting fluid are studied experimentally and theoretically. An alternating magnetic field is used, so that the field is largely excluded from the bulk of the fluid. Thus, the magnetic damping of the waves is negligible, and the perfectly conducting d.c. case is simulated. The effects of a finite electromagnetic skin depth, δ, are included in the calculation of the theoretical wave dispersion relation. It is predicted that as δ is increased and becomes comparable to the wavelength of the surface wave, the effect of the magnetic field on the fluid motion is decreased. This prediction is confirmed experimentally.

Information

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 33 , Issue 2 , 12 August 1968, pp. 337 - 351
Copyright
© 1968 Cambridge University Press

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