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research
Trapping microfluidic drops in wells of surface energy
Authors
Charles, N. Baroud
Rémi Dangla
Sunyon Lee
Publication date
1 January 2011
Publisher
American Physical Society
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Cite
Abstract
International audienceA small hole etched in the top of a wide microchannel creates a well of surface energy for a confined drop. This produces an attractive force F ? equal to the energy gradient, which is estimated from geometric arguments. We use the drag Fd from an outer flow to probe the trapping mechanism. When Fd < F?, the drop deforms but remains anchored to the hole. Its shape provides information about the pressure field. At higher flow velocities, the drop detaches, defining a critical capillary number for which Fd=F?. The measured anchoring force agrees with the geometric model. © 2011 American Physical Society
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Last time updated on 12/11/2016