Simulation of magnetohydrodynamic flows of liquid metals with heat transfer or magnetic stirring

Author:

Bhattacharya Shashwat1ORCID,Sanjari Seyed Loghman12,Krasnov Dmitry1,Boeck Thomas1ORCID

Affiliation:

1. Institute of Thermodynamics and Fluid Mechanics TU Ilmenau Ilmenau Germany

2. CTWe GmbH Henfenfeld Germany

Abstract

AbstractWe discuss the effects of nonhomogeneous magnetic fields in liquid metal flows in two different configurations. In the first configuration, we briefly report the impact of fringing magnetic fields in a turbulent Rayleigh–Bénard convection setup, where it was shown that the global heat transport decreases with an increase of fringe‐width. The convective motion in regions of strong magnetic fields is confined near the sidewalls. In the second configuration, we numerically study the effects of an oscillating magnetic obstacle with different frequencies of oscillation on liquid metal flow in a duct. The Reynolds number is low such that the wake of the stationary magnetic obstacle is steady. The transverse oscillation of the magnet creates a sinusoidal time‐dependent wake reminiscent of the vortex shedding behind solid obstacles. We examine the behavior of the streamwise and spanwise components of the Lorentz forces as well as the work done by the magnets on the fluid. The frequency of the oscillation of the streamwise component of Lorentz force is twice that of the spanwise component as in the case of lift and drag on solid cylindrical obstacles. The total drag force and the energy transferred from the magnets to the fluid show a nonmonotonic dependence on the frequency of oscillation of the magnetic obstacle indicative of a resonant excitation of the sinusoidal vortex shedding.

Funder

Alexander von Humboldt-Stiftung

Publisher

Wiley

Subject

Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics

Reference17 articles.

1. MAGNETOHYDRODYNAMICS IN MATERIALS PROCESSING

2. Barleon L. Mack K. J. &Stieglitz R.(1996).The MEKKA‐facility a flexible tool to investigate MHD‐flow phenomena(Technical Report FZKA 5821).

3. Effects of strong fringing magnetic fields on turbulent thermal convection

4. Numerical simulation of liquid-metal MHD flows in rectangular ducts

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