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Numerical Study of Bubble Behavior in Two-and Three-Dimensional Gas-Solid Fluidized Beds

Abbaszadeh Molaei, Esmaeil | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43860 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Molaei Dehkordi, Asghar
  7. Abstract:
  8. Because of the importance of gas-solid fluidized beds in chemical industrial plants, many experimental and modeling efforts have been conducted the prediction of their behaviors up to now. Gas bubbles have a pivotal role in the hydrodynamics of bubbling gas-solid fluidized beds; so, fundamental understanding of the bubbling behavior of fluidized beds is required to describe bubble-related phenomena such as solids mixing and segregation, reaction conversion, heat and mass transfer, erosion of heat-transfer tubes and particle entrainment. In this work, the effects of different parameters such as bed aspect ratio, bed width, superficial gas velocity, and particle size distribution on the bubble properties, in two-and three-dimensional freely bubbling gas-solid fluidized beds were studied with the help of simulation. Simulations were performed using TFM and DPM numerical approaches. The MFIX (Multiphase Flow with Interphase eXchanges) software developed at the department of energy National Energy Technology Laboratory (NETL) was used to model the gas-fluid system, and bubble properties such as size, aspect ratio, wake angle, and velocity were evaluated using Digital Image Analysis (DIA) technique. First, the results of MFIX and DIA have been verified with existing correlation and experimental results in the literatures, then, the main simulations were performed. Finally, the results of two-and three-dimensional gas-solid fluidized bed were compared
  9. Keywords:
  10. Solid-Gas Fluidized Bed ; Bubble ; Simulation ; Digital Images Analysis

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