2003/07/24 by Jean‐Baptiste Salmon, J-. B. Salmon, Sébastien Manneville +3 · 4 citations
Chemical Engineering · Chemistry · Materials Science · Physics and Astronomy · #Material Dynamics and Properties #Rheology and Fluid Dynamics Studies #Surfactants and Colloidal Systems #cond-mat.soft
paper · pdf · doi:10.1103/physreve.68.051503
published as Phys. Rev. E 68, 051503 (2003)
arxiv created 2003/07/24 · openalex publication_date 2003/11/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 with 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 confirm the classical assumption of the shear banding picture, in which the interface between bands lies at a given stress sigma(*). 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 et al., Phys. Rev. E 68, 051504 (2003)].