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Article Dans Une Revue Physics of Fluids Année : 2015

On the role of surface rheology in a magnetohydrodynamic swirling flow

Résumé

The original coupling between the surface rheology of a liquid metal surface and a supporting annular Couette magnetohydrodynamic (MHD) flow is theoretically and numerically investigated in this paper, in the general layout of the classical annular viscometer, as developed by Mannheimer and Schechter ["An improved apparatus and analysis for surface rheological measurements," J. Colloid Interface Sci. 32, 195-211 (1970)]. The purely hydrodynamic interplay between the main azimuthal flow (induced by a rotating floor) and the secondary overturning flow (generated by centrifugation) is found to be strongly affected by both surface viscous shear and surface viscous dilatation. When the flow is subjected to an outer vertical magnetic field, the impact of varying interface boundary conditions (through the surface shear and dilatational viscosities) at the gas/liquid interface profoundly alters the MHD flow topology. Particularly, when centrifugation competes with electromagnetic effects, advection of the main flow by the secondary flow is proved to affect significantly the core MHD flow, leading to a variety of atypical MHD flow patterns.
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Dates et versions

hal-01220251 , version 1 (29-03-2023)

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Jules Delacroix, Laurent Davoust. On the role of surface rheology in a magnetohydrodynamic swirling flow. Physics of Fluids, 2015, 27 (6), pp.22. ⟨10.1063/1.4922711⟩. ⟨hal-01220251⟩
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