Regensburg 2007 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 14: Fluid dynamics II

DY 14.2: Vortrag

Dienstag, 27. März 2007, 11:30–11:45, H2

Influence of inhomogenous magnetic field on the electric potential distribution in liquid metal channel flow — •Egbert Zienicke and Evgeny Votyakov — Institut für Physik, Technische Universität Ilmenau, Postfach 100565, 98684 Ilmenau

If an electrical conducting fluid, for example a liquid metal, flows through a stationary external generated magnetic field, electrical currents are induced which on their turn act on the fluid by the Lorentz force. The flow in the channel together with the magnetic field create an electrical field, respectice an electrical potential distribution inside the liquid metal. We derive by physical inspection and numerical simulations of MHD channel flow how the potential distribution changes from homogenous magnetic field to streamwise inhomogenous, and to streamwise and spanwise inhomogenous magnetic field (corresponding to magnetic poles above and below the channel). In the latter case closed level lines of the electric potential in the middle plane appear for high enough magnetic field, indicating the possibility of reverse flow under the magnet [1]. This finding is also confirmed experimentally by potential measurements in a liquid metal channel [2].

References

[1] E. Votyakov, E. Zienicke, Fluid Dynamics and Materials Processing, accepted for publication.

[2] O. Andreev, Y. Kolesnikov, A. Thess, Phys. Fluids 18 (2006) 065108