Breakup Dynamics for High-Viscosity Droplet Formation in a Flow-Focusing Device: Symmetrical and Asymmetrical Ruptures

被引:51
|
作者
Du, Wei [1 ]
Fu, Taotao [1 ]
Zhu, Chunying [1 ]
Ma, Youguang [1 ]
Li, Huai Z. [2 ]
机构
[1] Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China
[2] Univ Lorraine, CNRS, Lab React & Proc Engn, F-54001 Nancy, France
基金
中国国家自然科学基金;
关键词
high-viscosity droplet; breakup; microfluidics; interface; confinement; MICROFLUIDIC T-JUNCTION; CAPILLARY PINCH-OFF; FREE-SURFACE FLOWS; BUBBLE BREAKUP; FLUID; MECHANISM; BREAKDOWN; LIQUIDS;
D O I
10.1002/aic.15043
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
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
引用
收藏
页码:325 / 337
页数:13
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