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Phys Rev Lett. 2009 Jul 10;103(2):024501. Epub 2009 Jul 7.

Interfacial jetting phenomena induced by focused surface vibrations.

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1
Micro/Nanophysics Research Laboratory, Department of Mechanical Engineering, Monash University, Clayton, VIC 3800, Australia.

Abstract

We exploit large accelerations associated with surface acoustic waves to drive an extraordinary fluid jetting phenomena. Laterally focusing the acoustic energy to a small region beneath a drop placed on the surface causes rapid interfacial destabilization. Above a critical Weber number We, an elongated jet forms for drops with dimensions greater than the fluid sound wavelength. Further increases in We lead to single droplet pinch-off and subsequent axisymmetric breakup to form multiple droplets. A simple equation based on a momentum balance is derived to predict the jet velocity.

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