SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (11): 2733-2745.DOI: 10.1016/j.cjche.2020.06.036

• Fluid Dynamics and Transport Phenomena • 上一篇    下一篇

CFD simulation of impeller shape effect on quality of mixing in two-phase gas–liquid agitated vessel

Amir Heidari   

  1. Process Simulation and Modeling Laboratory (PSMlab), Faculty of Chemical, Petroleum and Gas Engineering, Semnan University, Semnan 3513119111, Iran
  • 收稿日期:2019-10-21 修回日期:2020-06-07 出版日期:2020-11-28 发布日期:2020-12-31
  • 作者简介:Amir Heidari,E-mail address:amirheidari@semnan.ac.ir.
  • 基金资助:
    The author is thankful from Semnan University for the financial support of this research (grant number 845).

CFD simulation of impeller shape effect on quality of mixing in two-phase gas–liquid agitated vessel

Amir Heidari   

  1. Process Simulation and Modeling Laboratory (PSMlab), Faculty of Chemical, Petroleum and Gas Engineering, Semnan University, Semnan 3513119111, Iran
  • Received:2019-10-21 Revised:2020-06-07 Online:2020-11-28 Published:2020-12-31
  • About author:Amir Heidari,E-mail address:amirheidari@semnan.ac.ir.
  • Supported by:
    The author is thankful from Semnan University for the financial support of this research (grant number 845).

摘要: Mixing efficiency in two-phase gas-liquid agitated vessel is one of the important challenges in the industrial processes. Computational fluid dynamics technique (CFD) was used to investigate the effect of four different pitched blade impellers, including 15°, 30°, 45° and 60°, on the mixing quality of gas-liquid agitated vessel. The multiphase flow behavior was modeled by Eulerian-Eulerian multiphase approach, and RNG k-ε was used to model the turbulence. The CFD results showed that a strong global vortex plays the main role on the mixing quality of the gas phase in the vessel. Based on the standard deviation criterion, it was observed that the axial distribution of the gas phase in the 30° impeller is about 55% better than the others. In addition, the results showed that the 30° impeller has a uniform radial distribution over the other impellers and the maximum gas phase holdup in the vessel. Investigation of the power consumption of the impellers showed that the 30° impeller has the highest power consumption among the other pitched blade impellers. Also, examine the effect of same power condition for pitched blade impellers showed that the 30° impeller has the best mixing quality in this condition.

关键词: Pitched blade impeller, Mixing, CFD, Multiphase flow, RNG k-ε model

Abstract: Mixing efficiency in two-phase gas-liquid agitated vessel is one of the important challenges in the industrial processes. Computational fluid dynamics technique (CFD) was used to investigate the effect of four different pitched blade impellers, including 15°, 30°, 45° and 60°, on the mixing quality of gas-liquid agitated vessel. The multiphase flow behavior was modeled by Eulerian-Eulerian multiphase approach, and RNG k-ε was used to model the turbulence. The CFD results showed that a strong global vortex plays the main role on the mixing quality of the gas phase in the vessel. Based on the standard deviation criterion, it was observed that the axial distribution of the gas phase in the 30° impeller is about 55% better than the others. In addition, the results showed that the 30° impeller has a uniform radial distribution over the other impellers and the maximum gas phase holdup in the vessel. Investigation of the power consumption of the impellers showed that the 30° impeller has the highest power consumption among the other pitched blade impellers. Also, examine the effect of same power condition for pitched blade impellers showed that the 30° impeller has the best mixing quality in this condition.

Key words: Pitched blade impeller, Mixing, CFD, Multiphase flow, RNG k-ε model