Study on the mechanism of droplet formation in T-junction microchannel
Study on the mechanism of droplet formation in T-junction microchannel
复制标题
T型连接微通道液滴形成机理研究
DOI：
10.1016/j.ces.2011.10.048
复制
发表时间：
2012-02-13
影响因子：
4.7
通讯作者：
Oshima, Marie
中科院分区：
文献类型：
--
作者：
Li, Xiao-Bin;Li, Feng-Chen;Oshima, Marie
本文对不互溶液/液T型连接系统中液滴的形成机理进行了数值和解析研究。不同的液滴流模式，如长段塞，小球，稳定的流连接到一个射流，并最终平行流观察，这是传统上称为挤压，滴和喷射制度出现在适当的数值设置。我们强调，在这个系统中的表面力和粘性力的影响交替主导液滴流，和周期性变化的压力和局部速度确保均匀液滴的产生。特别是，二维润滑分析应用于分散的新兴相和通道壁之间的受限连续流，这验证了上游的压力建立促进长段塞的形成。数值计算结果和理论分析与实验测量结果吻合较好。(C)2011爱思唯尔有限公司保留所有权利。
In the present paper, the mechanism of droplet formation in immiscible liquid/liquid T-junction system has been studied numerically and analytically. Different droplet stream patterns such as long slugs, small spheres, stable stream connected to a jet and finally parallel flow are observed, which are conventionally called squeezing, dripping and jetting regimes appearing under appropriate numerical setups. We emphasize that the effects of surface force and viscous force in this system alternatively dominate the droplets stream, and the periodically varied pressure and local velocity ensure the generation of uniform droplets. In particular, a two-dimensional lubrication analysis is applied to the confined continuous flow between dispersed emerging phase and the channel wall, which verifies that the pressure buildup upstream facilitate the long slugs formation. The numerical results and theoretical analysis hold a good agreement with the experimental measurements. (C) 2011 Elsevier Ltd. All rights reserved.