title: Observation of droplet size oscillations in a two-phase fluid under shear flow.
abstract: Experimental observations of droplet size sustained oscillations are reported in a two-phase flow between a lamellar and a sponge phase. Under shear flow, this system presents two different steady states made of monodisperse multilamellar droplets, separated by a shear-thinning transition. At low and high shear rates, the droplet size results from a balance between surface tension and viscous stress, whereas for intermediate shear rates it becomes a periodic function of time. A possible mechanism for such kinds of oscillations is discussed.
authors.affiliation: Centre de Physique Optique Moléculaire Hertzienne, UMR 5798, 351 Cours de la Libération, 33400 Talence, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Courbin
authors.forename: Pascal
authors.initials: P
authors.lastname: Panizza
authors.forename: Jean-Baptiste
authors.initials: JB
authors.lastname: Salmon