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Special Topics

EPJ E Colloquium – From shear banding to elastic turbulence

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While simple Newtonian liquids are structured at the molecular scale, complex fluids are structured at the mesoscopic scale. Shear-banding is a ubiquitous phenomenon in complex fluids. It relates to the formation of regions (bands) with different fluidities and stacked along the velocity gradient direction. Shear banding is a transition towards a heterogeneous state induced by the flow itself. It’s been observed in many systems of practical relevance, including giant (wormlike) micelles, telechelic polymers, emulsions, clay suspensions, colloidal gels, star polymers, granular materials, or foams. Giant micelles, the subject of a recent EPJE Colloquium, are elongated structures resulting from the self-assembly of amphiphilic molecules in aqueous solution. In the past twenty years, shear-banding flows in giant micelles have been probed by various techniques, such as rheometry, velocimetry and flow birefringence. The results collected point to time and space fluctuations that are difficult to explain. 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 Colloquium, Fardin and Lerouge present experimental evidence for a purely elastic instability of the high shear rate band as the main origin for fluctuating shear-banding flows.

Instabilities in wormlike micelle systems: From shear-banding to elastic turbulence. M.-A. Fardin und S. Lerouge, Eur. Phys. J. E (2012) 35: 91, DOI 10.1140/epje/i2012-12091-0

Managing Editors
Anne Ruimy (EDP Sciences) and Sabine Lehr (Springer-Verlag)
Dear Sabine and Isabelle,
Thank you so much for all your help and excellent work you did on the EPJ ST volume "Nonlinear Dynamics of Deterministic and Stochastic Systems: Unraveling Complexity". This was a great experience and collaboration.

Alexander Neiman (on behalf of the guest editors), Ohio University, Athens, USA
Editor EPJ Special Topics 222/10, 2013

ISSN: 1951-6355 (Print Edition)
ISSN: 1951-6401 (Electronic Edition)

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