Spatiotemporal dynamics of wormlike micelles under shear |
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Authors: | Bécu Lydiane Manneville Sébastien Colin Annie |
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Affiliation: | Centre de Recherche Paul Pascal, Avenue Schweitzer, 33600 Pessac, France. becu@crpp-bordeaux.cnrs.fr |
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Abstract: | Velocity profiles in a wormlike micelle solution (cetyl trimethyl ammonium bromide in D2O) are recorded using ultrasound every 2 s during a startup experiment into the shear-banding regime. The stress relaxation occurs over more than 6 h and corresponds to the very slow nucleation and growth of the high-shear band. Moreover, oscillations of the interface position with a period of about 50 s are observed during the growth process. Strong wall slip, metastable states, and transient nucleation of three-band flows are also reported and discussed in light of previous experiments and theoretical models. |
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