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Modeling and Simulation of Three-phase Tapered Fluidized Beds

Rezaei, Reza | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53302 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Molaei Dehkordi, Asghar
  7. Abstract:
  8. Gas–liquid–solid fluidized beds are widely used in the petrochemical, biochemical, biotechnology, and wastewater treatment industries. These beds have the advantage of appropriate mass and heat transfer, better temperature control, and more solid content. In the present work, computational studies have been conducted on two-dimensional tapered fluidized beds to characterize their hydrodynamic behaviour. The presence of two dispersed phases in these beds results in difference in interphase interactions compared to two-phase fluidized beds. Generally, the three phase fluidized beds create a more complex flow pattern than the conventional type of fluidized beds. Three-phase flow in these beds was simulated applying multiphase-Eulerian model with multifluid model (MFM) approach. In addition, solid phase properties were simulated using kinetic theory of granular flows and the simulation results were evaluated and validated against experimental data reported in the literature. Validation of the simulation results clearly shows that the multiphase-Eulerian model with MFM approach can be able to predict the experimental data with acceptable accuracy. With this validated model, the effects of various operating conditions and design parameters such as tapered angle, gas inlet velocity, liquid inlet velocity, initial bed height, diameter and density of solid particles, liquid phase properties, and the ratio of air to liquid flow rates on the hydrodynamic behavior of these beds were investigated carefully
  9. Keywords:
  10. Tapered Fluidized Bed ; Computational Fluid Dynamics (CFD) ; Eulerian Method ; Multi Fluid Modeling (MFM) ; Three-Phase Fluidized Beds ; Three Phase Flow ; Multiphase Euler Equations

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