Ejection of uniform micrometer-sized droplets from Faraday waves on a millimeter-sized water drop |
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Authors: | Tsai Shirley C Lin Shih K Mao Rong W Tsai Chen S |
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Affiliation: | Department of Chemical Engineering and Materials Science, University of California, Irvine, California 92697, USA. |
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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. |
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