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오늘 본 자료
Dawei Pan,Qiang Chen,Lan Xu,Can Yang,Meifang Liu,Weixing Huang,Bo Li 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.75 No.-
Theflow patterns and corresponding breakup dynamics of solid in water in oil compound droplets underperpendicular shear force were experimentally investigated in a microfluidic device. Three typicalflowpatterns, namely double-encapsulation, plugs, and cobbles, were found and be quantitativelydistinguished by the capillary number (Cac) of continuous phase and theflow rate ratio (R) ofcontinuous phase to dispersed phase. It is found that, under all offlow regimes, the consecutive entry ofsolid particles leads d1 (the neck thickness along the center of the side channel) varying periodically. Inthe double-encapsulation regime, the neck thickness (d2) between thefirst and second particle increasesas the interface deformation recovers driven by the interfacial tension force, whereas the neck thickness(d3) between the second and third particle decreases to break off because the neck has been stretchedlong to become thin enough. As for the cobbles regime, hydrostatic pressure difference still remainsdominant, but not a shearing force. Specially, different from the W/O droplet formation, it suggests thatvarious breakup dynamics are always caused by a non-free deformation of S/W interface and the largediameter of solid particle. Finally, theflow pattern diagrams dependent on Cac and R are obtained.