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Theoretical and Experimental Investigation of Particle Size Distribution in a Tapered Fluidized Bed for TiO2

Rasteh, Mojtaba | 2015

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 47719 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Farhadi, Fathollah; Bahramian, Alireza
  7. Abstract:
  8. This dissertation discusses the development of dimensionless correlations for predicting hydrodynamic parameters and CFD simulation of gas-solid two phase flow in conical fluidized beds. This research mainly focuses on the impact of particle size distribution on hydrodynamic parameters. The first section describes the experiments that were carried out with a number of gas–solid systems in a conical column to study certain important characteristics of the fluidized bed. Generalized empirical correlations, based on dimensionless analysis, have been developed in order to predict minimum fluidization velocity, minimum velocity of full fluidization, maximum pressure drop and bed expansion ratios. The advantage of this model over the existing models in literature is to taking the effect of inter particle forces into account. The accuracy of the model was significantly improved compare to the similar exiting ones. Second part of this dissertation discussed the Computational Fluid Dynamics (CFD) which was used to simulate the hydrodynamic behavior of gas–solid flow by commercial software, FLUENT. Experimental data including pressure drop, bed expansion ratio, local particle velocity and local particle volume fraction has been used to validate simulation models and parameters. Local experimental data has been obtained by optical fiber probe. After simulation models and parameter validation process, the effect of particle size distribution for TiO2 particles in four group of particle size distribution has been investigated by simultaneous applying of Two Fluid Model (TFM) and Population Balance Model (PBM). The Gidaspow model with the partial-slip BC and QUICK scheme for discretization of convection terms completely matches the experimental data for different particle size distribution
  9. Keywords:
  10. Particles Size Distribution ; Population Balance ; Two-Fluid Flow ; Minimum Fluidization Velocity ; Muximum Pressure Drop ; Minimum Velocity for Full Fluidization ; Bed Expansion Ratio

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