title: Ejection of uniform micrometer-sized droplets from Faraday waves on a millimeter-sized water drop.
abstract: This Letter reports the first observation and theoretical analysis of a new phenomenon: one large spherical water drop ejecting simultaneously a very large number of monodisperse microdroplets. An ultrasonic nozzle with multiple-Fourier horns in resonance enables controlled excitation of megahertz Faraday waves on the free water surface. The temporal instability of such waves leads to the ejection of 3.5-4.4  μm monodisperse droplets at a high rate (>4.0×10(7)  droplets/sec). This is in stark contrast to the Rayleigh-Plateau instability, which ejects one droplet at a time.
authors.affiliation: Department of Chemical Engineering and Materials Science, University of California, Irvine, California 92697, USA.
authors.forename: Shirley C
authors.initials: SC
authors.lastname: Tsai
authors.forename: Shih K
authors.initials: SK
authors.lastname: Lin
authors.forename: Rong W
authors.initials: RW
authors.lastname: Mao
authors.forename: Chen S
authors.initials: CS
authors.lastname: Tsai
mesh_terms: D057446:Hydrodynamics; D008956:Models, Chemical; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water