Magnetic induction by coherent vortex motion |
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| Authors: | P Odier J-F Pinton S Fauve |
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| Institution: | (1) Laboratoire de Physique (CNRS, UMR 5672), école Normale Supérieure de Lyon, 46 allée d'Italie, 69007 Lyon, France, FR;(2) Laboratoire de Physique Statistique (CNRS, UMR 8550), école Normale Supérieure, 24 rue Lhomond, 75005 Paris, France, FR |
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| Abstract: | We investigate experimentally the advection of a magnetic field by a flow of conducting fluid, at moderate magnetic Reynolds
numbers. More specifically, we study the influence of a large scale intense vortex on an externally applied field. We show
that at large scales the magnetic field lines are distorted in a way that is consistent with a scenario of magnetic field
expulsion by vorticity. Measurements at small scales show that the magnetic fluctuations are also quite sensitive to the large
scale vortex motion.
Received 27 October 1999 and Received in final form 16 March 2000 |
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| Keywords: | PACS 47 27 -i Turbulent flows convection and heat transfer - 47 65 +a Magnetohydrodynamics and electrohyrodynamics |
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