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

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

2008-06-24

arxiv.org/abs/0806.3872v1

Physics

Fluid Dynamics

accepted for Physical Review E

Scientific paper

10.1103/PhysRevE.78.015302

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.

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