Interface instability in shear banding flow

Abstract

We report on the spatio-temporal dynamics of the interface in shear-banding flow of a wormlike micellar system (cetyltrimethylammonium bromide and sodium nitrate in water) during a start-up experiment. Using the scattering properties of the induced structures, we demonstrate the existence of an instability of the interface between bands along the vorticity direction. Different regimes of spatio-temporal dynamics of the interface are indentified along the stress plateau. We build a model based on the flow symetry which qualitatively describes the observed patterns.

References in corpus (3)

• Spatio-temporal dynamics of wormlike micelles under shear
• Spatio-temporal oscillations and rheochaos in a simple model of shear banding
• Kinetics of the shear banding instability in startup flows

Cited by in corpus (9)

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• Taylor-like vortices in the shear-banding flow of giant micelles
• Vorticity structuring and Taylor-like velocity rolls triggered by gradient shear bands
• An elasto-visco-plastic model for immortal foams or emulsions
• Flow transitions in two-dimensional foams
• Superposition rheology of shear-banding wormlike micelles
• Describing the Flow Curve of Shear-Banding Fluids Through a Structural Minimal Model
• Discontinuous Jamming Transitions in Soft Materials