Phys. Rev. Lett. 103, 024501 (2009) [4 pages]Interfacial Jetting Phenomena Induced by Focused Surface Vibrations
See accompanying Physics Focus 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.024501
DOI:
10.1103/PhysRevLett.103.024501
PACS:
47.61.−k, 47.15.Uv, 47.55.N−, 68.35.Iv
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