SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 38 ›› Issue (10): 63-75.DOI: 10.1016/j.cjche.2020.10.026

• Fluid Dynamics and Transport Phenomena • 上一篇    下一篇

Study on gas-liquid flow characteristics in stirred tank with dual-impeller based on CFD-PBM coupled model

Songsong Wang, Qiuxiang Bu, Deyu Luan, Ying Zhang, Longbin Li, Zhaorui Wang, Wenhao Shi   

  1. College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
  • 收稿日期:2020-07-08 修回日期:2020-09-02 出版日期:2021-10-28 发布日期:2021-12-02
  • 通讯作者: Deyu Luan
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (52176040) and Shandong Provincial Natural Science Foundation of China (ZR2018LE015).

Study on gas-liquid flow characteristics in stirred tank with dual-impeller based on CFD-PBM coupled model

Songsong Wang, Qiuxiang Bu, Deyu Luan, Ying Zhang, Longbin Li, Zhaorui Wang, Wenhao Shi   

  1. College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
  • Received:2020-07-08 Revised:2020-09-02 Online:2021-10-28 Published:2021-12-02
  • Contact: Deyu Luan
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (52176040) and Shandong Provincial Natural Science Foundation of China (ZR2018LE015).

摘要: Study on gas-liquid flow in stirred tank with two combinations of dual-impeller (six-bent-bladed turbine (6BT)+six-inclined-blade down-pumping turbine (6ITD), the six-bent-bladed turbine (6BT)+six-inclined-blade up-pumping turbine (6ITU)) was conducted using computational fluid dynamics (CFD) and population balance model (PBM) (CFD-PBM) coupled model. The local bubble size was captured by particle image velocimetry (PIV) measurement. The gas holdup, bubble size distribution and gas-liquid interfacial area were explored at different conditions through numerical simulation. The results showed that the 4 mm bubbles accounted for the largest proportion of 33% at the gas flow rates Q = 0.76 m3·h-1 and 22% at Q = 1.52 m3·h-1 for combined impeller of 6BT + 6ITU, while the bubbles of 4.7 mm and 5.5 mm were the largest proportion for 6BT + 6ITD combination, i.e. 25% at Q = 0.76 m3·h-1 and 22% at Q = 1.52 m3·h-1, respectively, which indicated that 6BT + 6ITU could reduce bubble size effectively and promote gas dispersion. In addition, the gas holdup around impellers was increased obviously with the speed compared with gas flow rate. So it was concluded that 6ITU impeller could be more conductive to the bubble dispersion with more uniform bubble size, which embodied the advantages of 6BT + 6ITU combination in gas-liquid mixing.

关键词: Gas-liquid two-phase flow, Gas holdup, Gas-liquid interfacial area, Bubble, Coupling algorithm of CFD-PBM

Abstract: Study on gas-liquid flow in stirred tank with two combinations of dual-impeller (six-bent-bladed turbine (6BT)+six-inclined-blade down-pumping turbine (6ITD), the six-bent-bladed turbine (6BT)+six-inclined-blade up-pumping turbine (6ITU)) was conducted using computational fluid dynamics (CFD) and population balance model (PBM) (CFD-PBM) coupled model. The local bubble size was captured by particle image velocimetry (PIV) measurement. The gas holdup, bubble size distribution and gas-liquid interfacial area were explored at different conditions through numerical simulation. The results showed that the 4 mm bubbles accounted for the largest proportion of 33% at the gas flow rates Q = 0.76 m3·h-1 and 22% at Q = 1.52 m3·h-1 for combined impeller of 6BT + 6ITU, while the bubbles of 4.7 mm and 5.5 mm were the largest proportion for 6BT + 6ITD combination, i.e. 25% at Q = 0.76 m3·h-1 and 22% at Q = 1.52 m3·h-1, respectively, which indicated that 6BT + 6ITU could reduce bubble size effectively and promote gas dispersion. In addition, the gas holdup around impellers was increased obviously with the speed compared with gas flow rate. So it was concluded that 6ITU impeller could be more conductive to the bubble dispersion with more uniform bubble size, which embodied the advantages of 6BT + 6ITU combination in gas-liquid mixing.

Key words: Gas-liquid two-phase flow, Gas holdup, Gas-liquid interfacial area, Bubble, Coupling algorithm of CFD-PBM