Trapping microfluidic drops in wells of surface energy

Abstract : A 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.
Complete list of metadatas

Cited literature [12 references]  Display  Hide  Download

https://hal-polytechnique.archives-ouvertes.fr/hal-00998003
Contributor : Denis Roura <>
Submitted on : Tuesday, July 8, 2014 - 10:12:14 AM
Last modification on : Wednesday, March 27, 2019 - 4:39:25 PM
Long-term archiving on : Wednesday, October 8, 2014 - 10:40:42 AM

File

PhysRevLett.107.124501.pdf
Publisher files allowed on an open archive

Identifiers

Collections

Citation

Rémi Dangla, Sunyon Lee, Charles Baroud. Trapping microfluidic drops in wells of surface energy. Physical Review Letters, American Physical Society, 2011, 107 (12), pp.124501. ⟨10.1103/physrevlett.107.124501⟩. ⟨hal-00998003⟩

Share

Metrics

Record views

238

Files downloads

517