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Droplet breakup in microfluidic T-junctions at small capillary numbers

Abstract : We perform experimental studies of droplet breakup in microfluidic T-junctions in a range of capillary numbers lying between 4 10−4 and 2 10−1 and for two viscosity ratios of the fluids forming the dispersed and continuous phases. The present paper extends the range of capillary numbers explored by previous investigators by two orders of magnitude.We single out two different regimes of breakup. In a first regime, a gap exists between the droplet and the wall before breakup occurs. In this case, the breakup process agrees well with the analytical theory of Leshansky and Pismen Phys. Fluids 21, 023303 2009 . In a second regime, droplets keep obstructing the T-junction before breakup. Using physical arguments, we introduce a critical droplet extension for describing the breakup process in this case. © 2009 American Institute of Physics.
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Marie-Caroline Jullien, M.-J. Tsang Mui Ching, Céline Cohen, Laure Menetrier, Patrick Tabeling. Droplet breakup in microfluidic T-junctions at small capillary numbers. Physics of Fluids, American Institute of Physics, 2009, 21 (7), pp.072001. ⟨10.1063/1.3170983⟩. ⟨hal-00991895⟩



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