A flow-focusing geometry is integrated into a microfluidic device and used to study drop formation in liquid–liquid systems. A phase diagram illustrating the drop size as a function of flow rates and flow rate ratios of the two liquids includes one regime where drop size is comparable to orifice width and a second regime where drop size is dictated by the diameter of a thin “focused” thread, so drops much smaller than the orifice are formed. Both monodisperse and polydisperse emulsions can be produced.
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Research Article| January 15 2003
Formation of dispersions using “flow focusing” in microchannels
Special Collection: APL Classic Papers
Shelley L. Anna;
Shelley L. Anna, Nathalie Bontoux, Howard A. Stone; Formation of dispersions using “flow focusing” in microchannels. Appl. Phys. Lett. 20 January 2003; 82 (3): 364–366. https://doi.org/10.1063/1.1537519
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