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Novel phenomenological discrete bubble model of freely bubbling dense gas-solid fluidized beds: Application to two-dimensional beds

Movahedirad, S ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1002/aic.13729
  3. Publisher: 2012
  4. Abstract:
  5. A phenomenological discrete bubble model has been developed for freely bubbling dense gas-solid fluidized beds and validated for a pseudo-two-dimensional fluidized bed. In this model, bubbles are treated as distinct elements and their trajectories are tracked by integrating Newton's equation of motion. The effect of bubble-bubble interactions was taken into account via a modification of the bubble velocity. The emulsion phase velocity was obtained as a superposition of the motion induced by individual bubbles, taking into account bubble-bubble interaction. This novel model predicts the bubble size evolution and the pattern of emulsion phase circulation satisfactorily. Moreover, the effects of the superficial gas velocity, bubble-bubble interactions, initial bubble diameter, and the bed aspect ratio have been carefully investigated. The simulation results indicate that bubble-bubble interactions have profound influence on both the bubble and emulsion phase characteristics. Furthermore, this novel model may become a valuable tool in the design and optimization of fluidized-bed reactors
  6. Keywords:
  7. Discrete bubble modeling ; Bubble ; Bubble diameter ; Bubble interaction ; Bubble size ; Bubble velocities ; Bubble-bubble interaction ; Dense gas-solid fluidized bed ; Design and optimization ; Discrete bubble models ; Distinct elements ; Fluidized bed reactors ; Gas-solid fluidized bed ; Newton's equation of motion ; Phase characteristic ; Superficial gas velocities ; Aspect ratio ; Bubble columns ; Bubble formation ; Bubbles (in fluids) ; Chemical reactors ; Emulsification ; Emulsions ; Equations of motion ; Two dimensional ; Fluidized beds
  8. Source: AIChE Journal ; Volume 58, Issue 11 , January , 2012 , Pages 3306-3317 ; 00011541 (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1002/aic.13729/abstract