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Topological analysis of separation phenomena in liquid metal flow in sudden expansions. Part 2. Magnetohydrodynamic flow

Published online by Cambridge University Press:  23 March 2011

C. MISTRANGELO
C. MISTRANGELO*
Affiliation:
Karlsruhe Institute of Technology (KIT), IKET, Herrmann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen 76344, Germany
*
†Present address: KIT, Campus North, Postfach 3640, 76021 Karlsruhe, Germany. Email address for correspondence: [email protected]
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Abstract

A numerical study has been carried out to analyse liquid metal flows in a sudden expansion of electrically conducting rectangular ducts under the influence of an imposed uniform magnetic field. Separation phenomena are investigated by selecting a reference Reynolds number and by increasing progressively the applied magnetic field. The magnetic effects leading to the reduction of the size of separation zones that form behind the cross-section enlargement are studied by considering modifications of flow topology, streamline patterns and electric current density distribution. In the range of parameters investigated, the magnetohydrodynamic flow undergoes substantial transitions from a hydrodynamic-like flow to one dominated by electromagnetic forces, where the influence of inertia and viscous forces is confined to thin internal layers aligned with the magnetic field and to boundary layers that form along the walls. Scaling laws describing the reattachment length and the pressure drop in the sudden expansion are derived for intense magnetic fields.

JFM classification

MHD and Electrohydrodynamics: High-Hartmann-number flows Mathematical Foundations: Topological fluid dynamics
Type
Papers
Information
Journal of Fluid Mechanics , Volume 674 , 10 May 2011 , pp. 132 - 162
Copyright
Copyright © Cambridge University Press 2011

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