title: Viscoelastic Taylor-Couette instability as analog of the magnetorotational instability.
abstract: A linear stability analysis and an experimental study of a viscoelastic Taylor-Couette flow corotating in the Keplerian ratio allow us to elucidate the analogy between the viscoelastic instability and the magnetorotational instability (MRI). A generalized Rayleigh criterion allows us to determine the potentially unstable zone to pure-elasticity-driven perturbations. Experiments with a viscoelastic polymer solution yield four modes: one pure-elasticity mode and three elastorotational instability (ERI) modes that represent the MRI-analog modes. The destabilization by the polymer viscosity is evidenced for the ERI modes.
authors.affiliation: Laboratoire Ondes et Milieux Complexes, UMR No. 6294, CNRS, Université du Havre, 53 Rue de Prony, F-76058 Le Havre Cedex, France.
authors.forename: Yang
authors.initials: Y
authors.lastname: Bai
authors.affiliation: Laboratoire Ondes et Milieux Complexes, UMR No. 6294, CNRS, Université du Havre, 53 Rue de Prony, F-76058 Le Havre Cedex, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Crumeyrolle
authors.affiliation: Laboratoire Ondes et Milieux Complexes, UMR No. 6294, CNRS, Université du Havre, 53 Rue de Prony, F-76058 Le Havre Cedex, France.
authors.forename: Innocent
authors.initials: I
authors.lastname: Mutabazi