Abstract
Dynamics of non-Newtonian droplet (CMC aqueous solution) breakup with partial obstruction in microfluidic Y-junction was visually investigated. Three breakup stages were found: squeezing, transition and pinch-off. The effects of the concentration c of CMC, continuous capillary number Cac and dispersed phase local capillary number Cad on droplet breakup were studied. In squeezing stage and transition stage, the breakup process could be promoted by increasing Cad or decreasing c. The pinch-off stage relied primarily on the surface tension and was almost independent of inertial force and viscous force. For the shear thinning non-Newtonian droplet, the length of the daughter droplet was always linearly stretched with time until breakup and the maximum gap width increased with Cac, but decreased with the increases of c and Cad.
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