Spatio-temporal dynamics of wormlike micelles under shear

Details Spatio-temporal dynamics of wormlike micelles under shear Spatio-temporal dynamics of wormlike micelles under shear

2004-02-09

arxiv.org/abs/cond-mat/0402249v1

Phys. Rev. Lett., vol. 93, 018301 (2004)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures, submitted to Phys.Rev.Lett

Scientific paper

10.1103/PhysRevLett.93.018301

Velocity profiles in a wormlike micelle solution (CTAB in D2O) are recorded using ultrasound every 2 s after a step-like shear rate into the shear-banding regime. The stress relaxation occurs over more than six hours 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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