Coalescences of microdroplets at a cross-shaped microchannel junction without strictly synchronism control

被引：31

作者：

Wang, Kai ^{[1
]}

Lu, Yangcheng ^{[1
]}

Tostado, Chris P. ^{[1
]}

Yang, Lu ^{[1
]}

Luo, Guangsheng ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Chem Engn, State Key Lab Chem Engn, Beijing 100084, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2013年 / 227卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Coalescence; Microdroplet; Cross-shaped junction; Microchannel; MICROFLUIDICS; FLOW; MECHANISMS; DROPS; PLUGS; CHIP;

D O I：

10.1016/j.cej.2012.09.060

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In addition to the generation of micrometer scaled droplets, microchannel device can also serve as unique platform to control microdroplet coalescence. In this study, a cross-shaped microchannel junction is designed to realize head-on microdroplet coalescence without strict control of droplet synchronism. The flow characters of contacting microdroplets in confined microchannels are carefully examined and a critical capillary number (Ca* approximate to 0.005) for the occurrence of coalescence is identified for different working systems. Experimental analysis on the film drainage time and the droplet contact time are carefully discussed and a comparison between microdroplet coalescences in confined and free flowing spaces are taken for the in-depth understanding of microdroplet coalescence process. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：90 / 96

页数：7