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

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arxiv 1203.2130 v1 pith:55B5CIXZ submitted 2012-03-09 cond-mat.soft cond-mat.stat-mech

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

Nitin Kumar , Sayantan Majumdar , Aditya Sood , Rama Govindarajan , Sriram Ramaswamy , A.K. Sood This is my paper
classification cond-mat.soft cond-mat.stat-mech
keywords burstscateslongoscillatoryphyssettlingajdariaradian
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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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