Droplet generation at T-junctions in parallelized microchannels

IF 2 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Journal of Flow Chemistry Pub Date : 2023-08-16 DOI:10.1007/s41981-023-00281-1

Zhongdong Wang, Xingyu Xiang, Sajawal Raza, Asad Ullah, Chunying Zhu, Tianyang Feng, Youguang Ma, Taotao Fu

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Abstract

Microchemical technology is an advanced chemical production technology and the large-scale production for industrial applications is realized by parallelization of microchannels. In this paper, the emulsification process and numbering-up of droplets in asymmetric parallelized microchannels with T-junction are investigated, and the effects of fluid properties and operating conditions on droplet size are analyzed. The droplet generation process is divided into waiting stage, filling stage, necking stage, and pinch-off stage, according to the variation of the characteristic length scale during droplet generation. The flow patterns of droplet swarm in cavities and their influence on fluid distribution are analyzed. The droplet size prediction equation and fluid distribution model in asymmetric parallelized microchannel are constructed. The phenomenon of droplet asynchronous generation due to the coupling of parallelized microchannels during the numbering-up process is analyzed. The effect of asynchronous generation on droplet monodispersity is investigated and the mothod for the prevention of this effect is proposed.

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平行微通道中t型结的液滴生成

微化工技术是一种先进的化工生产技术，通过微通道并行化实现了工业应用的大规模生产。本文研究了带 T 型接头的非对称并行微通道中的乳化过程和液滴编号，分析了流体性质和操作条件对液滴大小的影响。根据液滴生成过程中特征长度尺度的变化，将液滴生成过程分为等待阶段、填充阶段、缩颈阶段和掐断阶段。分析了液滴群在空腔中的流动模式及其对流体分布的影响。构建了非对称并行微通道中液滴大小预测方程和流体分布模型。分析了在编号过程中由于并行微通道的耦合而导致的液滴异步生成现象。研究了异步生成对液滴单分散性的影响，并提出了防止这种影响的方法。

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来源期刊

Journal of Flow Chemistry CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

6.40

自引率

3.70%

发文量

审稿时长

>12 weeks

期刊介绍： The main focus of the journal is flow chemistry in inorganic, organic, analytical and process chemistry in the academic research as well as in applied research and development in the pharmaceutical, agrochemical, fine-chemical, petro- chemical, fragrance industry.