Taylor-like vortices in the shear-banding flow of giant micelles
arXiv:0909.0766 · doi:10.1103/PhysRevLett.103.028302
Abstract
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.
arXiv comment5 pages, 4 figures
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- Non-axisymmetric instability of shear-banded Taylor-Couette flow
- Suppression of the Rayleigh-Plateau instability on a vertical fibre coated with wormlike micelle solutions
- Surfactant micelles: model systems for flow instabilities of complex fluids
- Inertio-elastic instability of non shear-banding wormlike micelles
- Novel Experimentally Observed Phenomena in Soft Matter
- Banded spatiotemporal chaos in sheared nematogenic fluids
- Instability and stress fluctuations of a probe driven through a worm-like micellar fluid