Speaker
Prof.
Peter Frick
(Institute of Continuous Media Mechanics)
Description
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 ${\rm Re} \approx 3 \cdot 10^6$, 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 laminar value reaches about 50%.
