Formation of viscoelastic droplets in a step‐emulsification microdevice
Formation of viscoelastic droplets in a step‐emulsification microdevice
复制标题
步进乳化微装置中粘弹性液滴的形成
DOI：
10.1002/aic.17780
复制
发表时间：
2022-05
期刊：
影响因子：
3.7
通讯作者：
Taotao Fu
中科院分区：
文献类型：
--
作者：
Xiyang Liu;Shaokun Jiang;Chunying Zhu;Youguang Ma;Taotao Fu
本文以聚环氧乙烷甘油水溶液为分散相，环己烷为连续相，在分步乳化微装置中研究了粘弹性液滴的形成机理。粘弹性液滴的形成过程主要包括三个阶段：二维膨胀阶段、颈缩阶段和夹断阶段。弹性对二维扩张阶段基本没有影响，但可以延缓颈缩阶段的进程，并在夹断阶段引起液滴的串珠现象。结果表明，弹性对液滴尺寸的影响很小，但不可忽略。此外，弹性将与粘性力耦合以减小滴落状态的操作范围。最后，分析了弹性对卫星液滴形成的影响，并提出了防止卫星液滴影响的方法。
In this article, polyethylene oxide glycerin aqueous solution is used as the dispersed phase, and cyclohexane is used as the continuous phase to study the formation mechanism of viscoelastic fluid droplets in a step-emulsification microdevice. The formation process of viscoelastic droplets mainly includes three stages: two-dimensional expansion stage, necking stage, and pinch-off stage. The elasticity has basically no effect on the two-dimensional expansion stage, but it can delay the process of the necking stage and cause the beading phenomenon of droplets in the pinch-off stage. The results show that the effect of elasticity on the droplet size is weak, but it cannot be ignored. Moreover, the elasticity will be coupled with the viscous force to reduce the operating range of the dripping regime. Finally, the influence of the elasticity on the formation of satellite droplets is analyzed, and the method to prevent the influence of satellite droplets is proposed.