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Reduction of velocity fluctuations in a turbulent flow of gallium by an external magnetic field.

作者信息

Berhanu Michael, Gallet Basile, Mordant Nicolas, Fauve Stéphan

机构信息

Laboratoire de Physique Statistique, Ecole Normale Supérieure & CNRS, 24 Rue Lhomond, 75231 Paris Cedex 05, France.

出版信息

Phys Rev E Stat Nonlin Soft Matter Phys. 2008 Jul;78(1 Pt 2):015302. doi: 10.1103/PhysRevE.78.015302. Epub 2008 Jul 15.

DOI:10.1103/PhysRevE.78.015302
PMID:18764010
Abstract

The magnetic field of planets or stars is generated by the motion of a conducting fluid through a dynamo instability. The saturation of the magnetic field occurs through the reaction of the Lorentz force on the flow. In relation to this phenomenon, we study the effect of a magnetic field on a turbulent flow of liquid gallium. The measurement of electric potential differences provides a signal related to the local velocity fluctuations. We observe a reduction of velocity fluctuations at all frequencies in the spectrum when the magnetic field is increased.

摘要

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