Intermittency route to rheochaos in wormlike micelles with flow-concentration coupling

Ganapathy, Rajesh ; Sood, A. K. (2006) Intermittency route to rheochaos in wormlike micelles with flow-concentration coupling Physical Review Letters, 96 (10). 108301_1-108301_4. ISSN 0031-9007

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Official URL: http://prl.aps.org/abstract/PRL/v96/i10/e108301

Related URL: http://dx.doi.org/10.1103/PhysRevLett.96.108301

Abstract

We show experimentally that the route to chaos is via intermittency in a shear-thinning wormlike micellar system of cetyltrimethylammonium tosylate, where the strength of flow-concentration coupling is tuned by the addition of salt sodium chloride. A Poincaré first return map of the time series and the probability distribution of laminar lengths between burst events shows that our data is consistent with type-II intermittency. The coupling of flow to concentration fluctuations is evidenced by the "butterfly" intensity pattern in small angle light scattering (SALS) measurements performed simultaneously with the rheological measurements. The scattered depolarized intensity in SALS, sensitive to orientational order fluctuations, shows the same time dependence (like intermittency) as that of shear stress.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:50242
Deposited On:22 Jul 2011 13:56
Last Modified:18 May 2016 04:36

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