Droplet Ejection at Controlled Angles via Acoustofluidic Jetting

Physical Review Letters
William ConnacherJames Friend

Abstract

We study the nozzle-free ejection of liquid droplets at controlled angles from a sessile drop actuated from two, mutually opposed directions by focused surface acoustic waves with dissimilar parameters. Previous researchers assumed that jets formed in this way are limited by the Rayleigh angle. However, when we carefully account for surface tension in addition to the driving force, acoustic streaming, we find a quantitative model that reduces to the Rayleigh angle only when inertia is dominant, and suggests larger ejection angles are possible in many practical situations. We confirm this in demonstrating ejection at more than double the Rayleigh angle. Our model explains the effects of both fluid and input parameters on experiments with a range of liquids. We extract, from this model, a dimensionless number that serves as an analog for the typical Weber number for predicting single droplet events.

References

Apr 2, 2009·The Journal of Chemical Physics·Andrei S Dukhin, Philip J Goetz
Aug 8, 2009·Physical Review Letters·Ming K TanLeslie Y Yeo
Apr 7, 2010·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·P BrunetF Zoueshtiagh
Mar 4, 2014·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Michael B DentryJames R Friend
Sep 4, 2015·Soft Matter·Amarin G McDonnellRanganathan Prabhakar
May 31, 2018·Soft Matter·Jasmine O CastroLeslie Y Yeo
Jun 21, 2018·Lab on a Chip·William ConnacherJames Friend
Mar 28, 2019·Analytical Chemistry·Jasmine O CastroLeslie Y Yeo

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Citations

Apr 6, 2021·ACS Applied Materials & Interfaces·Yong WangYongQing Fu
Sep 3, 2021·The Journal of the Acoustical Society of America·Li ShanJ Mark Meacham

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