Nozzleless droplets formation with focused acoustic beams

Details Nozzleless droplets formation with focused acoustic beams Nozzleless droplets formation with focused acoustic beams

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aipc..197...49e&link_type=abstract

Drops and bubbles: third international colloquium. AIP Conference Proceedings, Volume 197, pp. 49-57 (1990).

Physics

Multiphase And Stratified Flows, Disperse Systems, Complex Fluids

Scientific paper

We report the use of focused acoustic beams to eject discrete droplets of controlled diameter and velocity and from a free liquid surface. No nozzles are involved. Droplet formation has been experimentally demonstrated over the frequency range of 5 to 300 MHz, with corresponding droplet diameters from 300 to 5 microns. The physics of droplet formation is essentially unchanged over this frequency range. For acoustic focusing elements having similar geometries, droplet diameter has been found to scale inversely with acoustic frequency. We summarize the results of a simple model which is used to obtain analytical expressions for the key parameters of droplet formation and their scaling with acoustic frequency. We also describe a more detailed theory which includes the linear propagation of the focused acoustic wave and the subsequent non-linear hydrodynamics of droplet formation. This latter phase is modeled numerically as an incompressible, irrotational process using a boundary integral vortex method. For simulations at 5 MHz, this numerical model is very successful in predicting the key features of droplet formation.

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