Magnetic permeability of a diphasic flow, made of liquid gallium and iron beads |
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Authors: | A Martin P Odier J-F Pinton S Fauve |
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Institution: | (1) Laboratoire de Physique (CNRS UMR 5672), école Normale Supérieure, 46 Allée d'Italie, 68007 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: | Magnetohydrodynamics studies in laboratory experiments have long been restricted to low magnetic Reynolds number flows, mainly
as a result of the very high magnetic diffusivity λ = 1/μσ of common conducting fluids (μ is the fluid's magnetic permeability
and σ its electrical conductivity). The best conductivities are found in liquid metals which have a unit magnetic permeability,
relative to vacuum. We show experimentally that a suspension of solid particles with a high magnetic permeability in a liquid
metal yields an effective medium that has a high electrical conductivity and an enhanced magnetic permeability. The dispersion
of the beads results from the turbulent fluid motion. The range of accessible magnetic Reynolds number can be increased by
a factor of as much as 4 in our experimental setup.
Received 6 March 2000 and Received in final form 13 July 2000 |
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Keywords: | PACS 47 65 +a Magnetohydrodynamics and electrohydrodynamics - 75 50 Mm Magnetic liquids - 47 55 Kf Multiphase and particle-laden flows |
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