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Investigation of Hydrodynamics of Spouted Beds with Draft Tube Using DPM Approach

Asadi Rad, Amir | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56623 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Molaie Dehkordi, Asghar
  7. Abstract:
  8. In this study the spouted bed with draft tube was investigated by discrete phase model for particulate phase and was tried to simulate the spouted bed with high precision by using of experimental data. So, the most accuracy combination of different parameters and sub models was specified. According to this study, the dispersed k-ԑ turbulence model and standard wall function make best prediction. Gidaspow drag model was used for prediction interaction between phases. This study include the effect of Saffman lift force and Rubinow-keller model was chosen for coefficient of Magnus lift force. In Addition, the solid movement pattern was studied in different area of bed especially in fountain region and the effect of geometrical parameters including length of entrance zone, length of draft tube, angle of conical zone and draft tube diameter was interrogated. The study was declared that increasing the length of the entrance zone due to the creation of better space for particle passage causes an increase in solids circulation rate while increasing the pressure drop and bed instability. The study of the length of draft tube indicates that it did not have a significant hydrodynamic effect as change in length of entrance zone and 45 degree for conical region was provided higher particle velocity and particle circulation rate. The survey of the diameter of the draft tube also reveals that its reduction causes the increase in solids circulation rate
  9. Keywords:
  10. Spouted Bed ; Draft Tube ; Simulation ; Hydrodynamic Analysis ; Discrete Phase Model ; Computational Fluid Dynamic-Discrete Element Method (CFD-DEM)

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