Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.124501
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Funding
- Chateaubriand fellowship
- Direction des Relations Exterieures of Ecole Polytechnique
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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-gamma equal to the energy gradient, which is estimated from geometric arguments. We use the drag F-d from an outer flow to probe the trapping mechanism. When F-d < F-gamma, 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 F-d = F gamma. The measured anchoring force agrees with the geometric model.
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