Vibration induced microfluidic atomization

Yeo, L, Qi, A and Friend, J 2008, 'Vibration induced microfluidic atomization', in Proceedings of the 61st Annual Meeting of the American Physical Society Division of Fluid Dynamics,23-25 November 2008, San Antonio,Texas, United States, 23-25 November 2008.


Document type: Conference Paper
Collection: Conference Papers

Title Vibration induced microfluidic atomization
Author(s) Yeo, L
Qi, A
Friend, J
Year 2008
Conference name 61st Annual Meeting of the American Physical Society Division of Fluid Dynamics
Conference location United States
Conference dates 23-25 November 2008
Proceedings title Proceedings of the 61st Annual Meeting of the American Physical Society Division of Fluid Dynamics,23-25 November 2008, San Antonio,Texas
Publisher American Physical Society
Place of publication United States
Abstract We demonstrate rapid generation of micron aerosol droplets in a microfluidic device in which a fluid drop is exposed to surface vibration as it sits atop a piezoelectric substrate. Little, however, is understood about the processes by which these droplets form due to the complex hydrodynamic processes that occur across widely varying length and time scales. Through experiments, scaling theory and numerical modelling, we elucidate the interfacial destabilization mechanisms that lead to droplet formation. Droplets form due to the axisymmetric break-up of cylindrical liquid jets ejected as a consequence of interfacial destabilization. Their 10 ?m size correlates with the jet radius and the instability wavelength, both determined from a viscous-capillary dominant force balance and confirmed through a numerical solution. With the exception of drops that spread into thin films with thicknesses on the order of the boundary layer dimension, the free surface is always observed to vibrate at the capillary-viscous resonance frequency despite the surface vibration frequency being several orders larger. This is contrary to common assumptions used in deriving subharmonic models resulting in a Mathieu equation, which has commonly led to spurious predictions in the droplet size
Subjects Fluid Physics
Acoustics and Acoustical Devices; Waves
Copyright notice © 2008 American Physical Society
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