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Liquid droplets having a nominal diameter of 10 mm are atomized (made into a fine spray) within 300-500 milliseconds when placed on a vibrating diaphragm. The droplet surface undergoes a hierarchy of instabilities that lead to the formation of surface waves and the atomization is a result of the rapid ejection of small secondary droplets from the crests of these waves. The evolution and rate of ejection depend on the interplay betweeen the primary droplet and the vibrating diaphragm.
reported by: Bojan Vukasinovic, Ari Glezer and Marc K. Smith, 52nd Annual APS Division of Fluid Dynamics Meeting, November 21-23, 1999, new Orleans