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Schematics of the microfluidic device. Droplets are formed at the first junction (droplet formation junction) and then split at the second junction (droplet splitting junction). The width and height of the channel are 100 and . The oil inlet B is used for droplet splitting.
Sequences of a typical breakup process at the flow focusing junction. The flow rate are, respectively, . Satellite droplets are highlighted with dashed circles in (f) and (i). (a) The mother droplet arrives at the junction. (b) Bulging of the head of the mother droplet. (c) The head partially blocks the downstream channel. (d) The mother droplet is squeezed and stretched. (e) The waist shrinks. (f) The detached daughter droplet recovers its plug shape. (g) The remaining droplet is squeezed and stretched. (h) The waist shrinks to form the second daughter droplet. (i) The second daughter droplet recovers its plug shape. (j) The remaining droplet passes the junction without breakup. (k) The three daughter droplets of plug shapes flow downstream.
Regimes of the droplet splitting performance for different flow rates.
Breakup of droplet in the jetting regime .
Regimes of the droplet splitting performance for different sizes of the mother droplet.
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