Unraveling interfacial jetting phenomena induced by focused surface acoustic waves

James Friend, Ming Tan, Leslie Yeo

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

1 Citation (Scopus)


Surface acoustic waves have been known to be able to drive fluid jetting phenomena, though the underlying physical mechanism has remained unclear. In a setup designed to reliably jet small fluid droplets, a pair of focused single-phase unidirectional transducers were placed facing each other along the x-axis of a 128°Y-X lithium niobate substrate. Driving both transducers at the same time, the laterally focused acoustic energy appears beneath a drop placed on the surface, refracting into the drop and causing destabilization of the drop's free surface. Above a critical Weber number We, an elongated jet forms for drops with dimensions greater than the fluid sound wavelength. Further increases in We leads to single droplet pinch-off and subsequent axisymmetric break-up to form multiple droplets. Derivation of a simple relationship based on the acoustics and fluid physics predicts the jetting behavior across a wide range of Newtonian fluids, droplet sizes, and input powers.

Original languageEnglish
Title of host publication2009 IEEE International Ultrasonics Symposium and Short Courses, IUS 2009
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages4
ISBN (Print)9781424443895
Publication statusPublished - 2009
EventIEEE International Ultrasonics Symposium (IUS) 2009 - Rome, Italy
Duration: 20 Sep 200923 Sep 2009
https://ieeexplore.ieee.org/xpl/conhome/5430769/proceeding (Proceedings)

Publication series

NameProceedings - IEEE Ultrasonics Symposium
ISSN (Print)1051-0117


ConferenceIEEE International Ultrasonics Symposium (IUS) 2009
Abbreviated titleIUS 2009
Internet address

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