title: Inertio-elastic instability of non shear-banding wormlike micelles.
abstract: Homogeneous polymer solutions are well known to exhibit viscoelastic flow instabilities: purely elastic when inertia is negligible and inertio-elastic otherwise. Recently, shear-banding wormlike micelle solutions were also discovered to follow a similar phenomenology. In the shear-banding regime, inertia is usually negligible so only purely elastic flows have been reported. Here, we investigate a non-shear-banding solution where inertia becomes significant, leading to flow patterns akin to the inertio-elastic regime of dilute polymer solutions. We show that the instability follows a supercritical bifurcation and we investigate the structure of the inertio-elastic vortices that develop above the onset.
authors.affiliation: Université de Lyon, Laboratoire de Physique, École Normale Supérieure de Lyon, CNRS UMR 5672 - 46 allée d'Italie, 69364 Lyon cedex 07, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Perge
authors.forename: Marc-Antoine
authors.initials: MA
authors.lastname: Fardin
authors.forename: Sébastien
authors.initials: S
authors.lastname: Manneville