Breakup dynamics of slender droplet formation in shear-thinning fluids in flow-focusing devices

被引：54

作者：

Fu, Taotao ^{[1
,2
]}

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, CNRS, Lab React & Proc Engn, 1 Rue Grandville,BP 20451, F-54001 Nancy, France

来源：

CHEMICAL ENGINEERING SCIENCE | 2016年 / 144卷

基金：

中国国家自然科学基金;

关键词：

Microfluidics; Complex fluids; Droplet; Breakup; Pinch-off; Hydrodynamics; MICROFLUIDIC T-JUNCTION; NON-NEWTONIAN FLUIDS; BUBBLE FORMATION; MECHANISM; COALESCENCE; GENERATION;

D O I：

10.1016/j.ces.2015.12.031

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

This work reports the breakup dynamics for slender droplet formation in shear-thinning fluids in flow focusing devices consisted of respectively 600 mu m and 400 mu m square microchannels. Silicon oil droplets are generated in non-Newtonian shear-thinning fluids-polyacrylamide (PAAm) aqueous solutions. The thinning of the thread of the dispersed phase during droplet formation can be characterized by a power law relationship with the remaining time before the final pinch-off, with an exponent of 1/3 in the non universal collapse stage, followed by an exponent of 1 in the final universal pinch-off stage. The dependence of the pre-factors on the viscosity ratio of both phases and the capillary number is discussed. A scaling law is proposed to predict the size of droplets formed in shear-thinning fluids in such devices by taking into account the rheological property of the non-Newtonian fluids as well as the hydrodynamics. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：75 / 86

页数：12

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