title: Cooperative breakups induced by drop-to-drop interactions in one-dimensional flows of drops against micro-obstacles.
abstract: Depending on the capillary number at play and the parameters of the flow geometry, a drop may or may not break when colliding with an obstacle in a microdevice. Modeling the flow of one-dimensional trains of monodisperse drops impacting a micro-obstacle, we show numerically that complex dynamics may arise through drop-to-drop hydrodynamic interactions: we observe sequences of breakup events in which the size of the daughter drops created upon breaking mother ones becomes a periodic function of time. We demonstrate the existence of numerous bifurcations between periodic breakup regimes and we establish diagrams mapping the possible breakup dynamics as a function of the governing (physicochemical, hydrodynamic, and geometric) parameters. Microfluidic experiments validate our model as they concur very well with predictions.
authors: IPR, UMR CNRS 6251, Campus Beaulieu, Université Rennes 1, 35042 Rennes, France. laurent.courbin@univ-rennes1.fr pascal.panizza@univ-rennes1.fr.
authors: Alexandre
authors: A
authors: Schmit
authors: Louis
authors: L
authors: Salkin
authors: Laurent
authors: L
authors: Courbin
authors: Pascal
authors: P
authors: Panizza