Breakup dynamics for droplet formation in a flow-focusing device: Rupture position of viscoelastic thread from matrix

被引：43

作者：

Du, Wei ^{[1
]}

Fu, Taotao ^{[1
]}

Zhang, Qindan ^{[1
]}

Zhu, Chunying ^{[1
]}

Ma, Youguang ^{[1
]}

Li, Huai Z. ^{[2
]}

机构：

[1] Tianjin Univ, State Key Lab Chem Engn, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China

[2] Univ Lorraine, Lab React & Proc Engn, CNRS, 1 Rue Grandville,BP 20451, F-54001 Nancy, France

来源：

CHEMICAL ENGINEERING SCIENCE | 2016年 / 153卷

基金：

中国国家自然科学基金;

关键词：

Microfluidic; Viscoelastic; Interface; Rupture position; Satellite droplets; ELASTIC FLUIDS; LOW-VISCOSITY; T-JUNCTION; FILAMENTS; LIQUIDS; EMULSIFICATION; TRANSITIONS;

D O I：

10.1016/j.ces.2016.07.038

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The breakup dynamics of the viscoelastic dispersed thread for droplet formation in a flow-focusing device was investigated by using a high-speed digital camera. Four breakup regimes of the viscoelastic thread were observed: besides the thread rupturing at both ends or at the downstream end likewise in Newtonian fluid, the breakup could also occur at the upstream end, displaying two additional patterns. For each breakup type, the breakup of the viscoelastic thread could be divided into a "flow-driven" stage controlled by the inertia of the dispersed phase and the dynamical radial pressure of the continuous phase, and an "elastocapillary" stage controlled by the elastic and capillary forces. The "elastocapillary" stage includes the stretching process and the fluid drainage process, depending on whether the balance between the elastic forces and the capillary forces reaches or not. The differences in breakup dynamics and liquid-liquid interface shape for the four breakup types depend exclusively on the elasticity of the viscoelastic thread. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：255 / 269

页数：15

共 41 条

[1] Inhibition of the finite-time singularity during droplet fission of a polymeric fluid [J].