title: Vortex-mediated bouncing drops on an oscillating liquid.
abstract: We have investigated the behavior of bouncing drops on a liquid surface by using particle image velocimetry analysis. A drop on an oscillating liquid surface is observed to not coalesce with the liquid and to travel along the surface if the oscillation is strong enough. A streaming vortex pair, induced by the alternatively distorted liquid surface, shows up below a bouncing drop. The time-averaged flow fields of the vortices are measured. In our quasi-one-dimensional setup, there are three stable distances for the drops, which can be characterized by the Faraday wavelength. The interactions of the vortex-mediated bouncing drops are deduced from the streamlines in the liquid bulk. We further show that a three-dimensional vortex ring is induced by a bouncing drop in a square cell.
authors.affiliation: Department of Physics, National Chung Cheng University, ChiaYi 62102, Taiwan.
authors.forename: Hong-Yu
authors.initials: HY
authors.lastname: Chu
authors.affiliation: Department of Physics, National Chung Cheng University, ChiaYi 62102, Taiwan.
authors.forename: Hsiang-Ting
authors.initials: HT
authors.lastname: Fei
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D008956:Models, Chemical; D017711:Nonlinear Dynamics; D009991:Oscillometry / Q000379:methods*; D012212:Rheology / Q000379:methods*; D033081:Shear Strength; D012996:Solutions / Q000737:chemistry*
chemical_list: D012996:Solutions