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Hydrodynamic behavior analysis of pulsed disc and doughnut column by CFD-PBM with modified drag law
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  • Boren Tan,
  • Dongbing Xu,
  • Yong Wang,
  • tao qi
Boren Tan
Institute of Process Engineering Chinese Academy of Sciences
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Dongbing Xu
Institute of Process Engineering Chinese Academy of Sciences
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Yong Wang
Institute of Process Engineering Chinese Academy of Sciences
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tao qi
Institute of Process Engineering Chinese Academy of Sciences
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Abstract

With increasing pulsation intensity from zero, the dispersed-phase holdup in pulsed disc and doughnut column (PDDC) decreases at first and then increases, which forms a U-shape trend. In this study, the modified drag law which is to account for the effect of turbulence is used for predicting the dispersed holdup with Computational Fluid Dynamics (CFD) simulations. The population balance model (PBM) kernel functions obtained from literatures are coupled with the CFD method to investigate the influence of drag law on the hydraulic performance of PDDC. The results indicate that the U-shape trend of dispersed holdup is successfully predicted with the modified drag law. The droplet size distribution and Sauter mean diameter with modified drag law is predicted better than that with Schiller-Nauman drag law. Local hydraulic performance and drag force field are illustrated to depict the typical flow behaviors in PDDC.