Mechanics & Industry
Volume 17, Number 6, 2016
|Number of page(s)||11|
|Published online||19 September 2016|
Surface viscometry in a uniform magnetic field
1 University of Grenoble Alpes,
Materials & Processes Science & Engineering (SIMaP) Laboratory,
Electromagnetic Processing of
Materials (EPM) Group, 38402 St-Martin d’ Hères, France
2 Grenoble Institute of Technology (Grenoble-INP), CNRS, Materials & Processes Science & Engineering (SIMaP) Laboratory, Electromagnetic Processing of Materials (EPM) Group, 38402 St-Martin d’ Hères, France
a Corresponding author:
Accepted: 24 April 2016
This paper addresses an original numerical coupling between surface mechanics of a gradually oxidizing liquid metal surface, and a supporting annular MHD flow, in the general layout of the classical annular viscometer, originally developed by Mannheimer et al. [J. Colloid Interface Sci. 32 (1970) 195–211]. A purely hydrodynamic interplay between a main azimuthal flow (induced by a rotating floor) and a secondary overturning flow generated by centrifugation is found to be strongly affected by both surface viscous shear and surface viscous dilatation. 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 original MHD flow patterns. The latter phenomenology reveals to be relevant to characterise the surface viscosities of a gradually oxidising liquid metal surface.
Key words: MHD / annular flow / surface viscosities / Hartmann layers
© AFM, EDP Sciences 2016
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