title: Strain-induced yielding in bubble clusters.
abstract: We study how shearing clusters of two or four bubbles induces bubble separation or topological rearrangement. The critical deformation at which this yielding occurs is measured as a function of shear rate, liquid composition, and liquid content in the cluster. We establish a geometrical yield criterion in the quasistatic case on the basis of these experimental data as well as simulations. In the dynamic regime, the deformation where the cluster yields increases with the strain rate, and we derive a scaling law describing this phenomenon based on the dynamical inertial rupture of the liquid meniscus linking the two bubbles. Our experiments show that the same scaling law applies to two- and four-bubble clusters.
authors.affiliation: Laboratoire de Physique de la Matière Condensée et Nanostructures, Université de Lyon, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5586, Domaine Scientifique de la Doua, F-69622 Villeurbanne Cedex, France. Anne-Laure.Biance@univ-lyon1.fr
authors.forename: Anne-Laure
authors.initials: AL
authors.lastname: Biance
authors.forename: Adelaide
authors.initials: A
authors.lastname: Calbry-Muzyka
authors.forename: Reinhard
authors.initials: R
authors.lastname: Höhler
authors.forename: Sylvie
authors.initials: S
authors.lastname: Cohen-Addad