Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2003-07-24
Phys. Rev. E 68, 051503 (2003)
Physics
Condensed Matter
Soft Condensed Matter
Scientific paper
10.1103/PhysRevE.68.051503
Using velocity profile measurements based on dynamic light scattering and coupled to structural and rheological measurements in a Couette cell, we present evidences for a shear-banding scenario in the shear flow of the onion texture of a lyotropic lamellar phase. Time-averaged measurements clearly show the presence of structural shear-banding in the vicinity of a shear-induced transition, associated to the nucleation and growth of a highly sheared band in the flow. Our experiments also reveal the presence of slip at the walls of the Couette cell. Using a simple mechanical approach, we demonstrate that our data confirms the classical assumption of the shear-banding picture, in which the interface between bands lies at a given stress $\sigma^\star$. We also outline the presence of large temporal fluctuations of the flow field, which are the subject of the second part of this paper [Salmon {\it et al.}, submitted to Phys. Rev. E].
Colin Angel
Manneville Sebastien
Salmon J-. B.
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