| 聚焦十字型微通道内高黏流体中气泡生成动力学 |
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| 引用本文： | 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. |
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| 作者姓名： | 张翀 付涛涛 姜韶堃 朱春英 马友光 |
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| 作者单位： | 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 |
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| 基金项目： | 国家自然科学基金项目（21576186，91634105，91434204，21276175）。 |
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| 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。
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| 关 键 词： | 微通道 高黏流体 两相流 气泡 动力学 |
| 收稿时间： | 2017-07-25 |
| 修稿时间： | 2017-09-19 |
Bubble forming dynamics of highly viscous fluids in microfluidic flow-focusing cross channel device |
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| 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].Journal of Chemical Industry and Engineering(China),2018,69(2):650-654. |
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| Authors: | ZHANG Chong FU Taotao JIANG Shaokun ZHU Chunying MA Youguang |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | microchannels highly viscous liquids two-phase flow bubble dynamics |
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