Geometry-controlled droplet generation in head-on microfluidic devices


Shui, Lingling and Mugele, Frieder and Berg, Albert van den and Eijkel, Jan C.T. (2008) Geometry-controlled droplet generation in head-on microfluidic devices. Applied Physics Letters, 93 (15). p. 153113. ISSN 0003-6951

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Abstract:We investigated the generation of droplets in a head-on microfluidic device operated with the two identical channels as inlets and the “long leg” as a constriction channel leading to a wider outlet section. For capillary numbers (Ca) of approximately 10−5 or less, we find a Ca-independent droplet volume equal to the volume of the constriction channel, which decreases at higher Ca when shear forces become relevant. The droplet generation mechanism is explained in terms of a global capillary instability involving surprisingly stable intermediate surface configurations.
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Copyright:© 2008 American Institute of Physics
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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