title: Blast wave attenuation in liquid foams: role of gas and evidence of an optimal bubble size.
abstract: Liquid foams are excellent systems to mitigate pressure waves such as acoustic or blast waves. The understanding of the underlying dissipation mechanisms however still remains an active matter of debate. In this paper, we investigate the attenuation of a weak blast wave by a liquid foam. The wave is produced with a shock tube and impacts a foam, with a cylindrical geometry. We measure the wave attenuation and velocity in the foam as a function of bubble size, liquid fraction, and the nature of the gas. We show that the attenuation depends on the nature of the gas and we experimentally evidence a maximum of dissipation for a given bubble size. All features are qualitatively captured by a model based on thermal dissipation in the gas.
authors.affiliation: Institut de Physique de Rennes, UMR 6251 CNRS/Université de Rennes 1, Rennes, France. isabelle.cantat@univ-rennes1.fr.
authors.forename: Martin
authors.initials: M
authors.lastname: Monloubou
authors.affiliation: Institut de Physique de Rennes, UMR 6251 CNRS/Université de Rennes 1, Rennes, France. isabelle.cantat@univ-rennes1.fr.
authors.forename: Myrthe A
authors.initials: MA
authors.lastname: Bruning
authors.affiliation: Institut de Physique de Rennes, UMR 6251 CNRS/Université de Rennes 1, Rennes, France. isabelle.cantat@univ-rennes1.fr.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Saint-Jalmes
authors.affiliation: Institut de Physique de Rennes, UMR 6251 CNRS/Université de Rennes 1, Rennes, France. isabelle.cantat@univ-rennes1.fr.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Dollet
authors.affiliation: Institut de Physique de Rennes, UMR 6251 CNRS/Université de Rennes 1, Rennes, France. isabelle.cantat@univ-rennes1.fr.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Cantat