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Accueil > Publications > Archives 2004-2010 > 2008

Nonlocal effects in flows of wormlike micellar solutions

C. Masselon, J.-B. Salmon, and A. Colin — Phys. Rev. Lett. 100 (2008) 38301

publié le

The flow curve of wormlike micelles usually exhibits a stress plateau S* separating high and low
viscosity branches, leading to shear-banded flows. We study the flow of semidilute wormlike micellar
systems in a confined geometry : a straight microchannel. We characterize their local rheology thanks to
particle image velocimetry. We show that flow curves cannot be described by a simple constitutive
equation linking the local shear stress to the local shear rate. We demonstrate the existence of nonlocal
effects in the flow of wormlike micellar systems and make use of a theoretical framework allowing the
measurement of correlation lengths.