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Geometrically mediated breakup of drops in microfluidic devices
D R Link1, S L Anna, D A Weitz
1Department of Physics, and DEAS, Harvard University, Cambridge, Massachusetts 02138, USA.
Physical Review Letters
|March 6, 2004
Abstract:
Microfluidic technology offers capabilities for the precise handling of small fluid volumes dispersed as droplets. To fully exploit this potential requires simultaneous generation of multiple size droplets. We demonstrate two methods for passively breaking larger drops into precisely controlled daughter drops using pressure-driven flow in simple microfluidic configurations: (i) a T junction and (ii) flow past isolated obstacles. We quantify conditions for breakup at a T junction and illustrate sequential breakup at T junctions for making small drops at high dispersed phase volume fractions.