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Updated: Jun 5, 2026

Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
Azimuthal instability of the interface in a shear banded flow by direct visual observation
J P Decruppe1, L Bécu, O Greffier
1Laboratoire de Physique des Milieux Denses Université Paul Verlaine Metz 1, Bld D.Arago F-57078 Metz cedex 3, France. Decruppe@univ-mezt.fr
Abstract:
The stability of the shear banded flow of a Maxwellian fluid is studied from an experimental point of view using rheology and flow visualization with polarized light. We show that the one-layer homogeneous flow cannot sustain shear rates corresponding to the end of the stress plateau. The high shear rate branch is not found and the shear stress oscillates at the end of the plateau. An azimuthal instability appears: the shear induced band becomes unstable and the interface between the two bands undulates in time and space with a period τ, a wavelength λ and a wave vector k parallel to the direction of the tangential velocity.
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