Direct Measurement of Effective Magnetic Diffusivity in Turbulent Flow of Liquid Sodium

Details Direct Measurement of Effective Magnetic Diffusivity in Turbulent Flow of Liquid Sodium Direct Measurement of Effective Magnetic Diffusivity in Turbulent Flow of Liquid Sodium

2010-09-22

arxiv.org/abs/1009.4333v1

Physics

Fluid Dynamics

5 pages, 6 figuser, accepted in PRL

Scientific paper

The first direct measurements of effective magnetic diffusivity in turbulent flow of electro-conductive fluids (the so-called beta-effect) under magnetic Reynolds number Rm >> 1 are reported. The measurements are performed in a nonstationary turbulent flow of liquid sodium, generated in a closed toroidal channel. The peak level of the Reynolds number reached Re \approx 3 10^6, which corresponds to the magnetic Reynolds number Rm \approx 30. The magnetic diffusivity of the liquid metal was determined by measuring the phase shift between the induced and the applied magnetic fields. The maximal deviation of magnetic diffusivity from its basic (laminar) value reaches about 50% .

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