title: Lamella Division in a Foam Flowing through a Two-Dimensional Porous Medium: A Model Fragmentation Process.
abstract: We flow a 2D foam through a model 2D porous medium and study experimentally and numerically how the bubble size distribution evolves along the medium. The dominant mechanism of bubble creation is a fragmentation process occurring when bubbles pinched against obstacles are split in two smaller bubbles. We infer the statistics of these individual and local fragmentation events from the experimental data and propose a fragmentation equation to relate that statistics to the evolution of the global size distribution. The predicted evolution shows very good agreement with direct experimental measurements of the bubble size distribution.
authors.affiliation: Institut de Physique de Rennes, UMR 6251 CNRS and Université Rennes 1, 35042 Rennes Cedex, France.
authors.forename: Baudouin
authors.initials: B
authors.lastname: Géraud
authors.affiliation: Géosciences Rennes, UMR 6118 CNRS and Université Rennes 1, 35042 Rennes Cedex, France.
authors.forename: Yves
authors.initials: Y
authors.lastname: Méheust
authors.affiliation: Institut de Physique de Rennes, UMR 6251 CNRS and Université Rennes 1, 35042 Rennes Cedex, France.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Cantat
authors.affiliation: Institut de Physique de Rennes, UMR 6251 CNRS and Université Rennes 1, 35042 Rennes Cedex, France.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Dollet