Dynamics of bubble breakup with partly obstruction in a microfluidic T-junction

被引：40

作者：

Wang, Xiaoda ^{[1
]}

Zhu, Chunying ^{[1
]}

Wu, Yining ^{[1
]}

Fu, Taotao ^{[1
]}

Ma, Youguang ^{[1
]}

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

来源：

CHEMICAL ENGINEERING SCIENCE | 2015年 / 132卷

基金：

中国国家自然科学基金;

关键词：

Bubble; Breakup; Microfluidic; Multiphase flow; Interface; Hydrodynamics; FLOW-FOCUSING DEVICES; FREE-SURFACE FLOWS; POLYGONAL CAPILLARIES; REYNOLDS-NUMBERS; LONG BUBBLES; DROP; MICROCHANNELS; TECHNOLOGY; TRANSITION; PLATFORMS;

D O I：

10.1016/j.ces.2015.04.038

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The bubble breakup with partly obstruction in a microfluidic T-junction was investigated experimentally in this paper. It was demonstrated that the breakup process could be divided into two stages: squeezing stage and pinch-off stage, according to the evolution of the minimum width of the bubble neck W-m. During the squeezing stage, the variation of 1 - W-m/W-c with time t could be scaled by a power law. In the pinch-off stage, the minimum width of the bubble neck W-m could also be correlated into a power law function with the remaining time (T-c - t). A tunnel, which characterized the bubble breakup with partly obstruction, appeared between the bubble tip and the microchannel wall in the squeezing stage, and exhibited little effect on the evolution of the bubble neck. However, the evolution of the bubble tip was obviously different before and after tunnel appearance. By means of the analysis on the dynamics of the bubble tip, some important parameters such as the final bubble length and the leakage volume were studied and discussed. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：128 / 138

页数：11

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