title: Elastic turbulence in shear banding wormlike micelles.
abstract: We study the dynamics of the Taylor-Couette flow of shear banding wormlike micelles. We focus on the high shear rate branch of the flow curve and show that for sufficiently high Weissenberg numbers, this branch becomes unstable. This instability is strongly subcritical and is associated with a shear stress jump. We find that this increase of the flow resistance is related to the nucleation of turbulence. The flow pattern shows similarities with the elastic turbulence, so far only observed for polymer solutions. The unstable character of this branch led us to propose a scenario that could account for the recent observations of Taylor-like vortices during the shear banding flow of wormlike micelles.
authors.affiliation: Laboratoire Matière et Systèmes Complexes, CNRS UMR 7057, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cédex 13, France.
authors.forename: M A
authors.initials: MA
authors.lastname: Fardin
authors.forename: D
authors.initials: D
authors.lastname: Lopez
authors.forename: J
authors.initials: J
authors.lastname: Croso
authors.forename: G
authors.initials: G
authors.lastname: Grégoire
authors.forename: O
authors.initials: O
authors.lastname: Cardoso
authors.forename: G H
authors.initials: GH
authors.lastname: McKinley
authors.forename: S
authors.initials: S
authors.lastname: Lerouge