Micrometer-sized droplet ejection from a millimeter-sized spherical water drop using a megahertz multiple-fourier horn ultrasonic nozzle

Author

Tsai, C.S. ; Lin, S.K. ; Mao, R.W. ; Tsai, Shih Chang

Author_Institution

Dept. of Electr. Eng. & Comp. Sci., Univ. of California, Irvine, Irvine, CA, USA

fYear

2012

fDate

7-10 Oct. 2012

Firstpage

2019

Lastpage

2022

Abstract

A new phenomenon on droplet ejection, namely, one large spherical water drop ejecting simultaneously a very large number of monodisperse micro droplets was observed and studied in detail. An ultrasonic nozzle with multiple-Fourier horns in resonance enables controlled excitation of megahertz Faraday waves on the spherical water surface which leads to the ejection of 3.5-4.4μm monodisperse droplets at a high rate (>10⁷ droplets per second). This is in stark contrast to the RayleighPlateau instability, which ejects one droplet at a time.

Keywords

confined flow; drops; flow instability; millimetre wave devices; nozzles; two-phase flow; ultrasonic devices; water; waves; H₂O; Rayleigh-Plateau instability; megahertz Faraday wave; megahertz multiple Fourier horn ultrasonic nozzle; micrometer sized droplet ejection; millimeter sized spherical water drop; monodisperse microdroplet; size 3.5 mum to 4.4 mum; spherical water surface; Acoustics; Face; Geometry; Liquids; Oscillators; Surface waves; Droplet ejection; Faraday waves; Fourier-horn ultrasonic nozzles; Spherical liquid surface; pulmonary drug delivery;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium (IUS), 2012 IEEE International

Conference_Location

Dresden

ISSN

1948-5719

Print_ISBN

978-1-4673-4561-3

Type

conf

DOI

10.1109/ULTSYM.2012.0505

Filename

6562064