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 (2): 348-361.DOI: 10.1016/j.cjche.2019.07.020

• Fluid Dynamics and Transport Phenomena • 上一篇    下一篇

CFD modeling of immiscible liquids turbulent dispersion in Kenics static mixers: Focusing on droplet behavior

M. M. Haddadi1, S. H. Hosseini2, D. Rashtchian1, G. Ahmadi3   

  1. 1 Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, Iran;
    2 Department of Chemical Engineering, Ilam University, Ilam 69315-516, Iran;
    3 Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY 13699-5725, USA
  • 收稿日期:2019-03-27 修回日期:2019-07-22 出版日期:2020-02-28 发布日期:2020-05-21
  • 通讯作者: S. H. Hosseini

CFD modeling of immiscible liquids turbulent dispersion in Kenics static mixers: Focusing on droplet behavior

M. M. Haddadi1, S. H. Hosseini2, D. Rashtchian1, G. Ahmadi3   

  1. 1 Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, Iran;
    2 Department of Chemical Engineering, Ilam University, Ilam 69315-516, Iran;
    3 Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY 13699-5725, USA
  • Received:2019-03-27 Revised:2019-07-22 Online:2020-02-28 Published:2020-05-21
  • Contact: S. H. Hosseini

摘要: The present study is concerned with the computational fluid dynamics (CFD) simulation of turbulent dispersion of immiscible liquids, namely, water-silicone oil and water-benzene through Kenics static mixers using the Eulerian-Eulerian and Eulerian-Lagrangian approaches of the ANSYS Fluent 16.0 software. To study the droplet size distribution (DSD), the Eulerian formulation incorporating a population balance model (PBM) was employed. For the Eulerian-Lagrangian approach, a discrete phase model (DPM) in conjunction with the Eulerian approach for continuous phase simulation was used to predict the residence time distribution (RTD) of droplets. In both approaches, a shear stress transport (SST) k-ω turbulence model was used. For validation purposes, the simulated results were compared with the experimental data and theoretical values for the Fanning friction factor, Sauter mean diameter and the mean residence time. The reliability of the computational model was further assessed by comparing the results with the available empirical correlations for Fanning friction factor and Sauter mean diameter. In addition, the influence of important geometrical and operational parameters, including the number of mixing elements and Weber number, was studied. It was found that the proposed models are capable of predicting the performance of the Kenics static mixer reasonably well.

关键词: CFD, Liquid-liquid dispersion, Kenics static mixer, Eulerian-Eulerian approach, Eulerian-Lagrangian approach

Abstract: The present study is concerned with the computational fluid dynamics (CFD) simulation of turbulent dispersion of immiscible liquids, namely, water-silicone oil and water-benzene through Kenics static mixers using the Eulerian-Eulerian and Eulerian-Lagrangian approaches of the ANSYS Fluent 16.0 software. To study the droplet size distribution (DSD), the Eulerian formulation incorporating a population balance model (PBM) was employed. For the Eulerian-Lagrangian approach, a discrete phase model (DPM) in conjunction with the Eulerian approach for continuous phase simulation was used to predict the residence time distribution (RTD) of droplets. In both approaches, a shear stress transport (SST) k-ω turbulence model was used. For validation purposes, the simulated results were compared with the experimental data and theoretical values for the Fanning friction factor, Sauter mean diameter and the mean residence time. The reliability of the computational model was further assessed by comparing the results with the available empirical correlations for Fanning friction factor and Sauter mean diameter. In addition, the influence of important geometrical and operational parameters, including the number of mixing elements and Weber number, was studied. It was found that the proposed models are capable of predicting the performance of the Kenics static mixer reasonably well.

Key words: CFD, Liquid-liquid dispersion, Kenics static mixer, Eulerian-Eulerian approach, Eulerian-Lagrangian approach