Formation characteristics of Taylor bubbles in a T-junction microchannel with chemical absorption

doi:10.1016/j.cjche.2021.06.002

Chinese Journal of Chemical Engineering ›› 2022, Vol. 46 ›› Issue (6): 214-222.DOI: 10.1016/j.cjche.2021.06.002

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Formation characteristics of Taylor bubbles in a T-junction microchannel with chemical absorption

Yaran Yin¹, Xianming Zhang¹, Chunying Zhu², Taotao Fu², Youguang Ma²

1 National Engineering Laboratory for Textile Fiber Materials and Processing Technology (Zhejiang), School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China;
2 State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Received:2021-04-12 Revised:2021-06-06 Online:2022-07-20 Published:2022-06-28
Contact: Xianming Zhang,E-mail:zhangxm@zstu.edu.cn;Youguang Ma,E-mail:ygma@tju.edu.cn
Supported by:
This study was supported by the National Natural Science Foundation of China (22008220, 21776200, 51973196), Natural Science Foundation of Zhejiang Province (LQ21B060009), and the Key Research and Development Program of Zhejiang Province (2020C01010).

Formation characteristics of Taylor bubbles in a T-junction microchannel with chemical absorption

Yaran Yin¹, Xianming Zhang¹, Chunying Zhu², Taotao Fu², Youguang Ma²

1 National Engineering Laboratory for Textile Fiber Materials and Processing Technology (Zhejiang), School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China;
2 State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

通讯作者: Xianming Zhang,E-mail:zhangxm@zstu.edu.cn;Youguang Ma,E-mail:ygma@tju.edu.cn
基金资助:
This study was supported by the National Natural Science Foundation of China (22008220, 21776200, 51973196), Natural Science Foundation of Zhejiang Province (LQ21B060009), and the Key Research and Development Program of Zhejiang Province (2020C01010).

Abstract

Abstract: This study focuses on the effect of chemical absorption on the formation dynamic characteristics and initial length of Taylor bubbles. The temporal evolutions of neck width and length of gaseous thread and initial length with and without chemical absorption were investigated with the Capillary number and Hatta number between 0.0010–0.0073 and 1.8–5.8 respectively. The squeezing regime with typical three stages, expansion, squeezing and pinch off is observed for both two processes. Compared with the non-absorption process, the increase of formation time in the chemical absorption process arises mainly from the expansion stage, and the decrease of initial length is from the necking stage. In addition, the temporal length evolution satisfies the power-law scale with the same exponent but a smaller pre-exponential factor. The correlations of neck width for stage transition and initial length with Hatta number demonstrate the enhancement effect of chemical absorption on bubble formation dynamics and initial length at relatively high chemical reaction rates and long formation time. This study provides insight into the bubble formation mechanism and helps to regulate the bubble initial size with chemical absorption.

Key words: Microchannels, Absorption, Bubble, Formation dynamics

摘要： This study focuses on the effect of chemical absorption on the formation dynamic characteristics and initial length of Taylor bubbles. The temporal evolutions of neck width and length of gaseous thread and initial length with and without chemical absorption were investigated with the Capillary number and Hatta number between 0.0010–0.0073 and 1.8–5.8 respectively. The squeezing regime with typical three stages, expansion, squeezing and pinch off is observed for both two processes. Compared with the non-absorption process, the increase of formation time in the chemical absorption process arises mainly from the expansion stage, and the decrease of initial length is from the necking stage. In addition, the temporal length evolution satisfies the power-law scale with the same exponent but a smaller pre-exponential factor. The correlations of neck width for stage transition and initial length with Hatta number demonstrate the enhancement effect of chemical absorption on bubble formation dynamics and initial length at relatively high chemical reaction rates and long formation time. This study provides insight into the bubble formation mechanism and helps to regulate the bubble initial size with chemical absorption.

关键词: Microchannels, Absorption, Bubble, Formation dynamics

Yaran Yin, Xianming Zhang, Chunying Zhu, Taotao Fu, Youguang Ma. Formation characteristics of Taylor bubbles in a T-junction microchannel with chemical absorption[J]. Chinese Journal of Chemical Engineering, 2022, 46(6): 214-222.

Yaran Yin, Xianming Zhang, Chunying Zhu, Taotao Fu, Youguang Ma. Formation characteristics of Taylor bubbles in a T-junction microchannel with chemical absorption[J]. 中国化学工程学报, 2022, 46(6): 214-222.

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Formation characteristics of Taylor bubbles in a T-junction microchannel with chemical absorption

Formation characteristics of Taylor bubbles in a T-junction microchannel with chemical absorption

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