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Viscosimetry of a non-Newtonian interface: The interesting role of MHD

K. Patouillet1, 2 - L. Davoust1 - O. Doche1

1 University Grenoble Alpes, CNRS, Grenoble INP, SIMAP, F-38000 Grenoble, France
2 Linamar Light Metal Casting, Techcenter 3 rue de Nogent, 60290 Laigneville, France

In this paper, a theoretical background is introduced to justify the interest of magnetohydrodynamics to surface viscosimetry of electrically conducting fluids, such as liquid or molten metals covered with a thin oxide layer. The system under consideration is based on an annular shallow-channel layout exposed to a uniform magnetic field. Due to the well-known 2D tendency of low-Rm magnetohydrodynamics, the vertically applied magnetic field allows to monitor the coupling between surface rheology and supporting flow. Thus, it is shown that a non-Newtonian behavior can be easily highlighted by adjusting the intensity of the magnetic field, whatever the mechanical behavior of the interface: shear-thinning or shear-thickening. Figs 4, Refs 17.

Magnetohydrodynamics 56, No. 2/3, 177-186, 2020 [PDF, 0.39 Mb]

Copyright: Institute of Physics, University of Latvia
Electronic edition ISSN 1574-0579
Printed edition ISSN 0024-998X