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

Kumar, Nitin ; Majumdar, Sayantan ; Sood, Aditya ; Govindarajan, Rama ; Ramaswamy, Sriram ; Sood, A. K. (2012) Oscillatory settling in wormlike-micelle solutions: bursts and a long time scale Soft Matter, 8 (16). pp. 4310-4313. ISSN 1744-683X

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Official URL: http://pubs.rsc.org/en/Content/ArticleLanding/2012...

Related URL: http://dx.doi.org/10.1039/C2SM25077B

Abstract

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.

Item Type:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:95915
Deposited On:27 Nov 2012 10:20
Last Modified:27 Nov 2012 10:20

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