Oscillatory settling in wormlike-micelle solutions: bursts and a long time scale

Details Oscillatory settling in wormlike-micelle solutions: bursts and a long time scale Oscillatory settling in wormlike-micelle solutions: bursts and a long time scale

2012-03-09

arxiv.org/abs/1203.2130v1

Soft Matter, 2012, 8, 4310-4313

Physics

Condensed Matter

Soft Condensed Matter

To appear in Soft Matter

Scientific paper

10.1039/C2SM25077B

We study the dynamics of a spherical steel ball falling freely through a solution of entangled wormlike-micelles. If the sphere diameter is larger than a threshold value, the settling velocity shows repeated short oscillatory bursts separated by long periods of relative quiescence. We propose a model incorporating the interplay of settling-induced flow, viscoelastic stress and, as in M. E. Cates, D. A. Head and A. Ajdari, Phys. Rev. E, 2002, 66, 025202(R) and A. Aradian and M. E. Cates, Phys. Rev. E, 2006, 73, 041508, a slow structural variable for which our experiments offer independent evidence.

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