Droplet breakup in flow past an obstacle : A capillary instability due to permeability variations

  title={Droplet breakup in flow past an obstacle : A capillary instability due to permeability variations},
  author={Suzie Proti{\`e}re and Martin Z. Bazant and David. A. Weitz and Howard A Stone},
In multiphase flow in confined geometries an elementary event concerns the interaction of a droplet with an obstacle. As a model of this configuration we study the collision of a droplet with a circular post that spans a significant fraction of the cross-section of a microfluidic channel. We demonstrate that there exist conditions for which a drop moves completely around the obstacle without breaking, while for the same geometry but higher speeds the drop breaks. Therefore, we identify a… CONTINUE READING


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