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

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

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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.

Item Type: Journal Article
Publication: Soft Matter
Publisher: Royal Society of Chemistry
Additional Information: Copyright of this article belongs to Royal Society of Chemistry.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 20 Apr 2012 12:36
Last Modified: 20 Apr 2012 12:36
URI: http://eprints.iisc.ac.in/id/eprint/44356

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