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Solids Mixing Behavior in two Dimensional Fluidized bed with Inlet Jet Effect

Fadaei, Hooman | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49333 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Molaei Dehkordi, Asghar
  7. Abstract:
  8. In this study, the mixing and segregation of different mixtures of solid particles with various density or size in gas-solid fluidized beds have been investigated. In this regard, the integrated model of computational fluid dynamics and discrete particle method (CFD-DPM) were used. The soft sphere contact scheme and the linear dashpot-spring model were applied for to evaluate the contact forces. After validating the simulation results with experimental data from the literature, effects of an inlet gas jet were investigated by using some quantitative and qualitative mixing indexes. Effects of gas velocity, percentage of heavy particles, density and particle size ratio, initial arrangement of the bed, bed aspect ratio, and drag force models on the mixing and segregation of solid particles were examined. The simulation results indicate that by increasing the gas velocity, the final amount of mixing index increases, moreover, the obtained results for the particles with different density and size in the either absence or presence of the gas jet were the same. In addition, increasing the gas velocity, the percentage of heavy particles, bed aspect ratio, reducing the density or size ratio of particles regardless of the inlet gas jet the, mixing index can be enhanced. Generally solid particles with the same size and different densities have better mixing than those with different sizes and the same density. Finally, to estimate the dispersion coefficient of the heavy particles, a correlation was drawn. This correlation can satisfactorily predict the dispersion coefficient of the solids in the axial direction while it fails in lateral direction
  9. Keywords:
  10. Fluidized Bed ; Computational Fluid Dynamic-Discrete Element Method (CFD-DEM) ; Inlet ; Solids Mixing and Segregation ; Inlet Jet

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