台阶式并行微通道内气泡群自组装行为及其对气泡生成的反馈效应

张志伟; 殷翔宇; 朱春英; 马友光; 付涛涛

doi:10.6052/0459-1879-19-251

台阶式并行微通道内气泡群自组装行为及其对气泡生成的反馈效应

天津大学化工学院, 化学工程联合国家重点实验室, 天津 300072

基金项目: 1)国家自然科学基金资助项目(91634105);国家自然科学基金资助项目(21878212);国家自然科学基金资助项目(21776200)

详细信息

通讯作者:
付涛涛

中图分类号: O359.1
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出版历程
- 收稿日期: 2019-09-05
- 刊出日期: 2020-04-09

SELF-ASSEMBLY OF BUBBLE SWARM IN LARGE CAVITIES IN STEP-TYPE PARALLELIZED MICROCHANNELS AND ITS FEEDBACK ON BUBBLE FORMATION

State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

摘要

摘要: 台阶式微通道乳化装置因易于高通量生产均一性的气泡及液滴而受到关注.本文利用高速摄像仪研究了台阶式并行微通道装置空腔内的气泡群复杂行为及其对气泡生成的反馈效应.实验设计的操作变量为气液相进出口位置、气相流速和液相流速. 在实验操作范围内,共发现了气泡的单管生成模式和多管生成模式.研究了空腔内气泡群复杂行为随操作条件的变化趋势. 发现在受限空间内,气泡在水平面内发生挤压堵塞能够自组装成具有特定几何特点的二维晶格,分别为有序的行三角晶格、有序的竖三角晶格和无序的三角晶格.晶格结构与气相压力密切相关; 同时, 气泡界面能量随着气相压力的增大而增大.运用介尺度、能量和活化等概念分析了气泡群复杂行为对气泡生成方式的影响,充分阐释了受限空间内气泡群的介尺度效应.以变异系数CV来表示气泡的均匀性特征, 考察了气泡晶格自组装行为的控制因素.结果表明: 气泡的自组装路径由气泡尺寸及其分布决定,有序的三角晶格变异系数小于5%, 无序的三角晶格变异系数大于5%.
- 微通道 /
- 气泡群 /
- 晶格 /
- 自组装 /
- 介尺度
Abstract: Step-emulsification microfluidic devices attract attentions due to the ability for the high-throughput production of bubbles and droplets. In this study, the bubble behavior of the bubble swarm in the cavity in a step-type parallelized microchannel and its feedback effect on bubble formation were studied by using a high-speed camera. The operating variables were the position of gas/liquid phase inlet, gas flow rate and liquid flow rate. Two bubble generation modes were observed: single-tube generation mode and multi-tube generation mode. The variation trend of the complex behavior of bubble swarm in the cavity with operating conditions was studied. It is found that in the confined space, the bubble can be self-assembled into a two-dimensional lattice with geometric features in the horizontal plane: including an ordered row triangular lattice, an ordered vertical triangular lattice, and a disordered triangular lattice. As the gas pressure changes, the crystal lattice changes, the bubble surface area becomes larger, and the interfacial energy becomes larger. Then, the effects of complex behavior of bubble swarm on bubble generation were analyzed by using the concepts of mesoscale, energy and activation. These fully explain the mesoscale characteristics of bubble behavior in confined spaces. The determinants of the bubble self-assembly path are revealed. It is indicated that the self-assembly path of bubbles is determined by the size and distribution of bubbles. The coefficient of variation of CV is used to represent the crystal structure of bubbles, and the coefficient of variation for the ordered triangular lattice is less than 5%, while that for the disordered triangular lattice is greater than 5%.
- microchannel /
- bubble swarm /
- lattice /
- self-assembly /
- mesoscale

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