Controlling the dimensionality of low-Rm MHD turbulence experimentally

Nathaniel Baker, Alban Potherat, Laurent Davoust, Francois Debray, Rico Alf Klein

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5 Citations (Scopus)
22 Downloads (Pure)

Abstract

This paper introduces an experimental apparatus, which drives turbulence electrically in a liquid metal pervaded by a high magnetic field. Unlike past magnetohydrodynamic setups involving a shallow confinement, the experiment presented here drives turbulence whose dimensionality can be set anywhere between three-dimensional and quasi two-dimensional. In particular, we show that the dimensionality and componentality of the turbulence thus generated are in fact completely fixed by the single parameter lz(li)/hlz(li)/h , which quantifies the competition between the solenoidal component of the Lorentz force and inertia acting on a turbulent structure of the size of the forcing scale lili . This parameter is fully tunable thanks to the three operating settings at hand: the injection scale, the intensity of the electric forcing and the magnitude of the magnetic field. Thanks to the very high number of measuring probes and fast acquisition rate implemented in this experiment, it is possible to reliably measure the finest features of the inertial range on a scale-wise basis.

Publisher Statement: The final publication is available at Springer via http://dx.doi.org/10.1007/s00348-017-2363-5
Original languageEnglish
Article number79
Number of pages15
JournalExperiments in Fluids
Volume58
Issue number7
Early online date5 Jun 2017
DOIs
Publication statusPublished - Jul 2017

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