title: Experimental observation of von Kármán vortices during drop impact.
abstract: The observation of von Kármán type vortices during the impact of water droplets onto a pool of water is reported. Shadowgraph imaging and laser-sheet visualization are used to document these events. The appearance of these vortices occurs within theoretically predicted regions in a Reynolds-splash number parameter space. In addition, and also in agreement with theoretical predictions, smooth splashing, with vortices absent, is found for smaller Reynolds number.
authors.affiliation: Department of Engineering, University of Cambridge, 17 Charles Babbage Road, Cambridge CB3 0FS, UK.
authors.forename: A A
authors.initials: AA
authors.lastname: Castrejón-Pita
authors.forename: J R
authors.initials: JR
authors.lastname: Castrejón-Pita
authors.forename: I M
authors.initials: IM
authors.lastname: Hutchings