Geometry-controlled droplet generation in head-on microfluidic devices

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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.
Original languageUndefined
Pages (from-to)153113
Number of pages3
JournalApplied physics letters
Issue number15
Publication statusPublished - Oct 2008


  • EWI-14748
  • IR-61462
  • METIS-250270

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