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