Taylor-like vortices in the shear-banding flow of giant micelles

Details Taylor-like vortices in the shear-banding flow of giant micelles Taylor-like vortices in the shear-banding flow of giant micelles

2009-09-03

arxiv.org/abs/0909.0766v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.103.028302

Using flow visualizations in Couette geometry, we demonstrate the existence of Taylor-like vortices in the shear-banding flow of a giant micelles system. We show that vortices stacked along the vorticity direction develop concomitantly with interfacial undulations. These cellular structures are mainly localized in the induced band and their dynamics is fully correlated with that of the interface. As the control parameter increases, we observe a transition from a steady vortex flow to a state where pairs of vortices are continuously created and destroyed. Normal stress effects are discussed as potential mechanisms driving the three-dimensional flow.

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