Visualization of droplet merging in microchannels using micro-PIV

Visualization of droplet merging in microchannels using micro-PIV Flow visualization via micro-PIV has been conducted in order to investigate droplet-merging processes in microchannels. The dispersed-phase droplets seeded with 1-μm fluorescent particles are alternately generated in the cross-channel and merged downstream in a straight channel or in a divergent channel. Since droplet merging occurs within a millisecond, a high-speed camera capable of 6,000 fps is used to capture the images of the droplets and the tracer particles therein by observing through a 40× lens. These images reveal that droplets merge through a sequential process of attachment, drainage, interface coalescence, penetration or envelopment depending on the channel geometry. In the straight channel, where the droplets are confined by the channel walls, the rear droplet penetrates the front droplet at the instant of coalescence. However, when the droplets merge in the divergent channel, a strong vortex motion occurs while the rear droplet envelops the front one. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Visualization of droplet merging in microchannels using micro-PIV

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Publisher
Springer-Verlag
Copyright
Copyright © 2011 by Springer-Verlag
Subject
Engineering; Engineering Fluid Dynamics; Engineering Thermodynamics, Heat and Mass Transfer; Fluid- and Aerodynamics
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-011-1221-0
Publisher site
See Article on Publisher Site

Abstract

Flow visualization via micro-PIV has been conducted in order to investigate droplet-merging processes in microchannels. The dispersed-phase droplets seeded with 1-μm fluorescent particles are alternately generated in the cross-channel and merged downstream in a straight channel or in a divergent channel. Since droplet merging occurs within a millisecond, a high-speed camera capable of 6,000 fps is used to capture the images of the droplets and the tracer particles therein by observing through a 40× lens. These images reveal that droplets merge through a sequential process of attachment, drainage, interface coalescence, penetration or envelopment depending on the channel geometry. In the straight channel, where the droplets are confined by the channel walls, the rear droplet penetrates the front droplet at the instant of coalescence. However, when the droplets merge in the divergent channel, a strong vortex motion occurs while the rear droplet envelops the front one.

Journal

Experiments in FluidsSpringer Journals

Published: Oct 28, 2011

References

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