The breakup mechanism of high-viscosity thread for droplet formation in a flow-focusing device is investigated using a high-speed digital camera. Aqueous solution of 89.5%-glycerol is used as the dispersed phase, while silicone oil as the continuous phase. The breakup process of the dispersed thread presents two categories: symmetrical rupture and asymmetrical rupture. Furthermore, the rupture behavior could be divided into two stages: the squeezing stage controlled by the squeezing pressure and the pinch-off stage controlled by viscous stresses of both phases and surface tension. Specifically, it suggests that the differences in the shape of the liquid-liquid interface and the dynamics in the two breakup processes are caused by the disparity of the strain field at the point of detachment. Moreover, the thinning rate and the dynamics of the dispersed thread change with the viscosity of the continuous phase, but are less dependent of the flow rate of the continuous phase. (C) 2015 American Institute of Chemical Engineers
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Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Peoples R ChinaNanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Peoples R China
Wang, Kaibo
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Li, Dege
Xie, Jianuo
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Tech Univ Munich, Sch Engn & Design, D-85748 Munich, GermanyNanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Peoples R China
Xie, Jianuo
Ni, Ganggang
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Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Peoples R ChinaNanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Peoples R China
Ni, Ganggang
Li, Zihao
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China Univ Petr East China, Coll Mech & Elect Engn, Qingdao 266580, Peoples R ChinaNanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Peoples R China
Li, Zihao
Sun, Qiang
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Univ Tulsa, MaDougall Sch Petr Engn, Tulsa, OK 74104 USANanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Peoples R China
Sun, Qiang
Zhang, Yanzhen
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China Univ Petr East China, Coll Mech & Elect Engn, Qingdao 266580, Peoples R ChinaNanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Peoples R China
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Indian Inst Technol Roorkee, Mech & Ind Engn Dept, Flow Control & Turbine Res Lab FLOW CTRL, Roorkee 247667, IndiaIndian Inst Technol Roorkee, Mech & Ind Engn Dept, Flow Control & Turbine Res Lab FLOW CTRL, Roorkee 247667, India
Maurya, Tara Chand Kumar
Dutta, Sushanta
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Indian Inst Technol Roorkee, Mech & Ind Engn Dept, Roorkee 247667, IndiaIndian Inst Technol Roorkee, Mech & Ind Engn Dept, Flow Control & Turbine Res Lab FLOW CTRL, Roorkee 247667, India
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Ohio State Univ, Dept Mech & Aerosp Engn, Columbus, OH 43210 USA
Ohio State Univ, Dept Biomed Engn, Columbus, OH 43210 USAOhio State Univ, Dept Mech & Aerosp Engn, Columbus, OH 43210 USA
Huang, Haishui
He, Xiaoming
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Ohio State Univ, Dept Biomed Engn, Columbus, OH 43210 USA
Ohio State Univ, Davis Heart & Lung Res Inst, Columbus, OH 43210 USA
Ohio State Univ, Ctr Comprehens Canc, Columbus, OH 43210 USAOhio State Univ, Dept Mech & Aerosp Engn, Columbus, OH 43210 USA