聚焦十字型微通道内高黏流体中气泡生成动力学

doi:10.11949/j.issn.0438-1157.20170968

化工学报 ›› 2018, Vol. 69 ›› Issue (2): 650-654.DOI: 10.11949/j.issn.0438-1157.20170968

聚焦十字型微通道内高黏流体中气泡生成动力学

张翀¹, 付涛涛¹, 姜韶堃², 朱春英¹, 马友光¹

1 化学工程联合国家重点实验室, 天津大学化工学院, 天津 300072;
2 中国船舶重工集团公司第七一八研究所, 河北邯郸 056027

收稿日期:2017-07-25 修回日期:2017-09-19 出版日期:2018-02-05 发布日期:2018-02-05
通讯作者: 付涛涛
基金资助:
国家自然科学基金项目（21576186，91634105，91434204，21276175）。

Bubble forming dynamics of highly viscous fluids in microfluidic flow-focusing cross channel device

ZHANG Chong¹, FU Taotao¹, JIANG Shaokun², ZHU Chunying¹, MA Youguang¹

1 State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 The 718 th Research Institute of China Shipbuilding Industry Corporation, Handan 056027, Hebei, China

Received:2017-07-25 Revised:2017-09-19 Online:2018-02-05 Published:2018-02-05
Supported by:
supported by the National Natural Science Foundation of China (21576186, 91634105, 91434204, 21276175).

摘要/Abstract

摘要：

利用高速摄像仪观察了聚焦十字型微通道内高黏度（630 mPa·s）的甘油-水溶液中氮气气泡的生成过程。研究了气泡生成过程以及气泡体积和最小颈部半径的变化规律。结果表明，高黏流体内气泡生成过程可分为回缩、膨胀、挤压和最终破裂4个阶段。气泡体积在膨胀和挤压阶段均随时间线性增长，但挤压阶段的斜率大于膨胀阶段的斜率。气泡最小颈部半径随时间变化分为两个不同的阶段：在挤压阶段，颈部半径随剩余时间呈幂率关系；而在最终破裂阶段，颈部半径随时间呈线性关系。

关键词: 微通道, 高黏流体, 两相流, 气泡, 动力学

Abstract:

N₂ bubble formation in highly viscous (630 mPa·s) glycerol-water solution in a microfluidic flow-focusing cross channel device was observed by using a high-speed camera. Bubble forming process, size, and minimal neck radius were studied. The results show that the bubble formation process can be divided into stages of retraction, expansion, collapse, and final breakup. The bubble size was increased linearly with time in both expansion and collapse stages, which the slope in the collapse stage was greater than that in the expansion stage. The decrease of minimal neck radius of bubbles against time was different in two stages, i.e., a power-law to remaining time in the collapse stage and a linearity with time in the final breakup stage.

Key words: microchannels, highly viscous liquids, two-phase flow, bubble, dynamics

中图分类号:

TQ021.4

张翀, 付涛涛, 姜韶堃, 朱春英, 马友光. 聚焦十字型微通道内高黏流体中气泡生成动力学[J]. 化工学报, 2018, 69(2): 650-654.

ZHANG Chong, FU Taotao, JIANG Shaokun, ZHU Chunying, MA Youguang. Bubble forming dynamics of highly viscous fluids in microfluidic flow-focusing cross channel device[J]. CIESC Journal, 2018, 69(2): 650-654.

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聚焦十字型微通道内高黏流体中气泡生成动力学

Bubble forming dynamics of highly viscous fluids in microfluidic flow-focusing cross channel device

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