Direct Measurement of Effective Magnetic Diffusivity in Turbulent Flow of Liquid Sodium
arXiv:1009.4333 · doi:10.1103/PhysRevLett.105.184502
Abstract
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% .
5 pages, 6 figuser, accepted in PRL
References in corpus (3)
Cited by in corpus (14)
- Dynamo theories
- Shell Models of Magnetohydrodynamic Turbulence
- Stability and instability of hydromagnetic Taylor-Couette flows
- Modes and instabilities in magnetized spherical Couette flow
- Dissipative effects on the sustainment of a magnetorotational dynamo in Keplerian shear flow
- Turbulence Reduces Magnetic Diffusivity in a Liquid Sodium Experiment
- Effects of magnetic and kinetic helicities on the growth of magnetic fields in laminar and turbulent flows by helical-Fourier decomposition
- Self-excitation in a helical liquid metal flow: The Riga dynamo experiments
- Magnetic induction maps in a magnetized spherical Couette flow experiment
- Magnetic induction and diffusion mechanisms in a liquid sodium spherical Couette experiment
- Magnetic material in mean-field dynamos driven by small scale helical flows
- Laboratory experiments on dynamo action and magnetically triggered flow instabilities
- Observational characterisation of large-scale transport and horizontal turbulent diffusivity in the quiet Sun
- MHD Turbulence in spin-down flows of liquid metals