title: Flower patterns in drop impact on thin liquid films.
abstract: We describe experimentally the formation of a pattern for drop impacts on thin liquid films for a large range of impact parameters. Using the shallow-water approximation, we are able to explain the main mechanisms leading to these patterns: it consists in the linear instability of the self-similar axisymmetric radial solution of the equations. Agreement between the experiments and the theory is remarkably good, leading, in particular, to the prediction that the most unstable fold number scales like (We/h∞)2/7.
authors.affiliation: LAUM, UMR CNRS 6613, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Lagubeau
authors.forename: Marco A
authors.initials: MA
authors.lastname: Fontelos
authors.forename: Christophe
authors.initials: C
authors.lastname: Josserand
authors.forename: Agnès
authors.initials: A
authors.lastname: Maurel
authors.forename: Vincent
authors.initials: V
authors.lastname: Pagneux
authors.forename: Philippe
authors.initials: P
authors.lastname: Petitjeans