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

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 frequenc...

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Bibliographic Details
Main Authors: Cheung, Yin Nee, Nguyen, Nam Trung, Wong, Teck Neng
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2014
Subjects:
Online Access:https://hdl.handle.net/10356/101722
http://hdl.handle.net/10220/24217
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Institution: Nanyang Technological University
Language: English
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Summary: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.