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Licensed Unlicensed Requires Authentication Published by De Gruyter June 11, 2013

Magnetohydrodynamics applied to materials processing

Yves Fautrelle, Roland Ernst and René Moreau

Abstract

In the processing of liquid materials various operations are performed, e. g., alloying, homogenisation of the composition, refining or inclusion removal. As was realised early on by Charles Crussard, electromagnetic effects can be used to process electrically conducting materials without any contact. When alternating magnetic fields are used, the material is directly heated and melted thanks to the induced electric currents. The induced electromagnetic forces are capable of shaping the free surface, levitating a liquid blob and stirring the liquid bulk or its surface. The latter principle may be applied to electrically conducting liquids such as metallic alloys, but also to poorly conducting materials such as oxides, glasses or plasmas. Those effects are used in many processes such as induction furnaces for liquid metals or glasses, refining ladles, electromagnetic levitation, continuous casting of aluminium or steel. In this paper, typical effects based on the use of electromagnetic systems are reviewed, as well as the corresponding applications.


* Correspondance address, Yves Fautrelle, Professor at Grenoble Polytechnic Institute (France)SIMAP/EPM Laboratory, Grenoble-INP, PHELMA-Campus PO Box 75, 38402 Saint Martin d'Hères cedex, France Tel.: +33 476 82 52 05 Fax: +33 476 82 52 49 E-mail:

Dedicated to the late Prof. Charles Crussard (1916–2008)


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Received: 2008-10-6
Accepted: 2009-8-17
Published Online: 2013-06-11
Published in Print: 2009-10-01

© 2009, Carl Hanser Verlag, München