title: Gyroscopic instability of a drop trapped inside an inclined circular hydraulic jump.
abstract: A drop of moderate size deposited inside a circular hydraulic jump remains trapped at the shock front and does not coalesce with the liquid flowing across the jump. For a small inclination of the plate on which the liquid is impacting, the drop does not always stay at the lowest position and oscillates around it with a sometimes large amplitude, and a frequency that slightly decreases with flow rate. We suggest that this striking behavior is linked to a gyroscopic instability in which the drop tries to keep constant its angular momentum while sliding along the jump.
authors.affiliation: Laboratoire de Physique de la Matière Condensée et Nanostructures, UMR 5586 CNRS & Université de Lyon; Université Lyon I, 69622 Villeurbanne, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Pirat
authors.forename: Luc
authors.initials: L
authors.lastname: Lebon
authors.forename: Antoine
authors.initials: A
authors.lastname: Fruleux
authors.forename: Jean-Sébastien
authors.initials: JS
authors.lastname: Roche
authors.forename: Laurent
authors.initials: L
authors.lastname: Limat