title: Defect-mediated turbulence in ribbons of viscoelastic Taylor-Couette flow.
abstract: Transition to defect-mediated turbulence in the ribbon patterns observed in a viscoelastic Taylor-Couette flow is investigated when the rotation rate of the inner cylinder is increased while the outer cylinder is fixed. In four polymer solutions with different values of the elasticity number, the defects appear just above the onset of the ribbon pattern and trigger the appearance of disordered oscillations when the rotation rate is increased. The flow structure around the defects is determined and the statistical properties of these defects are analyzed in the framework of the complex Ginzburg-Landau equation.
authors.affiliation: Université de Brest, FRE CNRS 3744 IRDL, 29238 Brest, France.
authors.forename: Noureddine
authors.initials: N
authors.lastname: Latrache
authors.affiliation: Morphodynamique Continentale et Côtière, UMR6143,CNRS-Université de Caen, Normandie Université, 24, rue des Tilleuls, 14000 Caen Cedex 3, France.
authors.forename: Nizar
authors.initials: N
authors.lastname: Abcha
authors.affiliation: Laboratoire Ondes et Milieux Complexes (LOMC),UMR 6294, CNRS-Université du Havre, Normandie Université, B.P. 540, 76058 Le Havre Cedex, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Crumeyrolle
authors.affiliation: Laboratoire Ondes et Milieux Complexes (LOMC),UMR 6294, CNRS-Université du Havre, Normandie Université, B.P. 540, 76058 Le Havre Cedex, France.
authors.forename: Innocent
authors.initials: I
authors.lastname: Mutabazi