The European Physical Journal E

, 35:91

Instabilities in wormlike micelle systems

From shear-banding to elastic turbulence
Colloquium

DOI: 10.1140/epje/i2012-12091-0

Cite this article as:
Fardin, M.A. & Lerouge, S. Eur. Phys. J. E (2012) 35: 91. doi:10.1140/epje/i2012-12091-0

Abstract

Shear-banding is ubiquitous in complex fluids. It is related to the organization of the flow into macroscopic bands bearing different viscosities and local shear rates and stacked along the velocity gradient direction. This flow-induced transition towards a heterogeneous flow state has been reported in a variety of systems, including wormlike micellar solutions, telechelic polymers, emulsions, clay suspensions, colloidal gels, star polymers, granular materials, or foams. In the past twenty years, shear-banding flows have been probed by various techniques, such as rheometry, velocimetry and flow birefringence. In wormlike micelle solutions, many of the data collected exhibit unexplained spatio-temporal fluctuations. Different candidates have been identified, the main ones being wall slip, interfacial instability between bands or bulk instability of one of the bands. In this review, we present experimental evidence for a purely elastic instability of the high shear rate band as the main origin for fluctuating shear-banding flows.

Keywords

Colloquium 

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Laboratoire Matière et Systèmes ComplexesCNRS UMR 7057-Université Paris DiderotParis Cédex 13France
  2. 2.Department of Mechanical EngineeringMassachusetts Institute of TechnologyCambridgeUSA
  3. 3.The Academy of BradylogistsParisFrance

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