Flow field of single CO2 bubbles freely rising in MEA solutions: The time-resolved PIV measurement and its effect on bubble mass transfer

被引：0
|
作者：
Zheng, Longyun [1 ,2 ]
Liu, Yujin [1 ,2 ]
Xia, Yannan [1 ,2 ]
Liu, Kun [1 ,2 ]
Zhang, Bo [1 ,2 ]
Wang, Guangchao [1 ,2 ]
Feng, Zuhao [1 ,2 ]
Guo, Kai [1 ,2 ]
Jiang, Nan [3 ]
Liu, Chunjiang [1 ,2 ]
机构：
[1] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China
[2] Tianjin Univ, State Key Lab Chem Engn, Tianjin 300072, Peoples R China
[3] Tianjin Univ, Sch Mech Engn, Tianjin 300072, Peoples R China
来源：
CHEMICAL ENGINEERING JOURNAL | 2024年 / 502卷
关键词：
CO; 2; capture; Bubble; Bubbly flow; Mass transfer; Flow field; TR-PIV; TRANSFER COEFFICIENT; SURFACE-TENSION; LIQUID; GAS; ABSORPTION; ALKANOLAMINES; CONTAMINATION; VELOCITY; MOTION; WAKE;
D O I：
10.1016/j.cej.2024.157707
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The flow field in the liquid phase has an important effect on the bubble motion and the interfacial mass transfer. However, it has not been elucidated in the CO2 chemical absorption. In this study, firstly, the flow field around a ca. 5 mm CO2 bubble freely rising in monoethanolamine (MEA) solutions is measured by the time-resolved particle image velocimetry (TR-PIV). The liquid-side mass transfer coefficient (kL) of CO2 bubbles in ultrapure water and MEA solutions is measured by high-speed photography with 3D reconstruction. The results show that the instantaneous flow field around the bubble not only affects the bubble motion but also correlates with the bubble mass transfer rate. Furthermore, kL is related to the pseudo-dissipation rate (epsilon*) around the bubble during the linear rise. Finally, a quantitative relationship between the kL of CO2 bubbles and the epsilon* in MEA solutions is established based on the stagnant cap model.
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页数：15
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