Low-frequency acoustic atomization with oscillatory flow around micropillars in a microfluidic device

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Cheung, Yin Nee
Nam, Trung Nguyen
Wong, Teck Neng
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2014
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Abstract

This letter reports a low frequency acoustic atomization technique with oscillatory extensional flow around micropillars. Large droplets passing through two micropillars are elongated. Small droplets are then produced through the pinch-off process at the spindle-shape ends. As the actuation frequency increases, the droplet size decreases with increasing monodispersity. This method is suitable for in-situ mass production of fine droplets in a multi-phase environment without external pumping. Small particles encapsulation was demonstrated with the current technique.

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Applied Physics Letters
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105
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14
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© 2014 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Appl. Phys. Lett. 105, 144103 (2014) and may be found at dx.doi.org/10.1063/1.4897343.
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Subject
Physical sciences
Acoustics and acoustical devices; waves
Engineering
Microelectromechanical systems (MEMS)
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