Generating gas/liquid/liquid three-phase microdispersed systems in double T-junctions microfluidic device |
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Authors: | K Wang Y C Lu J Tan B D Yang G S Luo |
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Affiliation: | (1) The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, 100084 Beijing, China; |
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Abstract: | This article describes the generation of microdispersed bubbles and droplets in a double T-junctions microfluidic device to
form immiscible gas/liquid/liquid three-phase flowing systems. Segmented gas plugs are controllably prepared in water at the
first T-junction to form gas/liquid two-phase fluid with the perpendicular flow cutting method. Then using this two-phase
fluid as the cross-shearing fluid for the oil phase at the second T-junction, the gas/liquid/liquid three-phase flowing systems
are prepared. Interestingly, it is found that the break-up of the oil droplets is mainly dominated by the cutting effect of
the gas/liquid interface or the pressure drop across the emerging droplet, but independent with the viscous shearing effect
of the continuous phase, even at the capillary number (Ca = u
wμw/γow) higher than 0.01. The size laws and the distributions of the bubbles and droplets are investigated carefully, and a mathematical
model has been developed to relating the operating conditions with the dispersed sizes. |
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Keywords: | |
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