title: Contact time of a bouncing drop.
abstract: When a liquid drop lands on a solid surface without wetting it, it bounces with remarkable elasticity. Here we measure how long the drop remains in contact with the solid during the shock, a problem that was considered by Hertz for a bouncing ball. Our findings could help to quantify the efficiency of water-repellent surfaces (super-hydrophobic solids) and to improve water-cooling of hot solids, which is limited by the rebounding of drops as well as by temperature effects.
authors.affiliation: Laboratoire de Physique de la Matière Condensée, URA 792 du CNRS, Collège de France, Paris, France.
authors.forename: Denis
authors.initials: D
authors.lastname: Richard
authors.forename: Christophe
authors.initials: C
authors.lastname: Clanet
authors.forename: David
authors.initials: D
authors.lastname: Quéré