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The European Physical Journal B

, Volume 64, Issue 3–4, pp 537–542 | Cite as

Spatiotemporal dynamics of shear induced bands en route to rheochaos

  • R. GanapathyEmail author
  • S. Majumdar
  • A. K. Sood
Article

Abstract

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.

PACS

82.70.Uv Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems 47.50.-d Non-Newtonian fluid flows 83.85.Ei Optical methods; rheo-optics 83.60.Wc Flow instabilities 

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Copyright information

© Springer 2008

Authors and Affiliations

  1. 1.Department of PhysicsIndian Institute of ScienceBangaloreIndia

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