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Spatiotemporal dynamics of shear induced bands en route to rheochaos

Ganapathy, R and Majumdar, S and Sood, AK (2008) Spatiotemporal dynamics of shear induced bands en route to rheochaos. In: The European Physical Journal B - Condensed Matter and Complex Systems, 64 (3-4). pp. 537-542.

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We show experimentally that the route to rheochaos in shear rate relaxation measurements is via Type-III intermittency and mixed mode oscillations in the shear-thinning wormlike micellar system of cetyltrimethylammonium tosylate in the presence of salt sodium chloride. Depolarised small angle light scattering measurements performed during flow show that scattered intensity temporally follows the shear rate/stress dynamics and portrays the crucial role played by nematic ordering. Direct visualization of the gap of the Couette cell, illuminated by an unpolarised laser sheet, in the (vorticity, velocity gradient) plane shows that the spatiotemporal dynamics of the shear induced structures is closely related to the temporal behaviour of shear rate/stress fluctuations.

Item Type: Journal Article
Related URLs:
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 18 Nov 2009 09:46
Last Modified: 19 Sep 2010 04:52
URI: http://eprints.iisc.ernet.in/id/eprint/16448

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