title: Interfacial jetting phenomena induced by focused surface vibrations.
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.
authors: Micro/Nanophysics Research Laboratory, Department of Mechanical Engineering, Monash University, Clayton, VIC 3800, Australia.
authors: Ming K
authors: MK
authors: Tan
authors: James R
authors: JR
authors: Friend
authors: Leslie Y
authors: LY
authors: Yeo