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The cylinder wake in a magnetic field aligned with the velocity

Published online by Cambridge University Press:  26 April 2006

J. Lahjomri ,
Ph. Capéran  and
A. Alemany
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Abstract

We investigate experimentally the up- and downstream flow around an insulating cylinder in a conducting fluid subjected to an aligned magnetic field for low values of the magnetic Reynolds number Rm. For high values of the Alfvén number α = B0/U0(ρμ0)½ the upstream flow is characterized by magnetic and kinematic wakes. In this configuration we have measured, for the first time, the local values of the induced magnetic field. The results were analysed in a confined situation and show that the Oseen number k = ½Rm(1-α2) is the main parameter that characterizes the perturbation. In the downstream flow the two fields of perturbations (magnetic and kinetic) are characterized by von Kármán eddies. Our experiments were focused on the evolution of these eddies and show in particular that the critical Reynolds number increases strongly with the intensity of the magnetic field.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 253 , August 1993 , pp. 421 - 448
Copyright
© 1993 Cambridge University Press

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