Timescales in shear banding of wormlike micelles
O. Radulescu, P. D. Olmsted, J. P. Decruppe, S. Lerouge, J. F. Berret, G. Porte
Abstract
We show the existence of three well defined time scales in the dynamics of wormlike micelles after a step between two shear rates on the stress plateau. These time scales are compatible with the presence of a structured interface between bands of different viscosities and correspond to the isotropic band destabilization during the stress overshoot, reconstruction of the interface after the overshoot and travel of a fully formed interface. The last stage can be used to estimate a stress diffusion coefficient.
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