Lorentz force velocimetry for high velocity liquid sodium flow

I. Sokolov¹ - V. Noskov² - A. Pavlinov² - Y. Kolesnikov³

¹ German Aerospace Center e.V. (DLR), Institute of Engineering Thermodynamics, Hein-Saß-Weg 22, 21129 Hamburg, Germany }
² Institute of Continuous Media Mechanics, 1 Korolyov str., 614013 Perm, Russia }
³ Ilmenau University of Technology, Helmholtzring 1, 98693 Ilmenau, Germany

Abstract
The first direct measurements of the Lorentz force in a highly turbulized liquid sodium flow are reported. The non-stationary flow is driven by braking the rotating titanium channel filled with liquid sodium. In the end of the braking, the maximum magnetic Reynolds number reaches \Rm ≈ 8. It corresponds to the case when the induced magnetic field is strong enough to change the distribution of the initially applied field by expelling it from the medium. The field expulsion leads to a non-trivial relation between the Lorentz force and the sodium velocity. Authors present results of the measurements of the induced magnetic field as well as of the measurements of the Lorentz force for the magnetic Reynolds number ranging 0.1 to 7.6. Tables 1, Figs 8, Refs 21.