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Numerical investigation of gas bubble behavior in tapered fluidized beds

Khodabandehlou, R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.partic.2017.05.013
  3. Abstract:
  4. In this article, the behavior of gas bubbles in tapered fluidized beds is investigated with the use of a two-fluid model incorporating kinetic theory of granular flow. The effects of various parameters such as apex angle, particle size, and particle density on the size distribution and the rise velocity of gas bubbles were examined. In addition, the simulation results for the bubble fraction and axial velocity of gas bubbles were compared with experimental data reported in the literature and good agreement was observed. As the apex angle was increased, the fraction of gas bubbles with large sizes increased and the fraction of bubbles with small sizes decreased. As the particle size increased, the fraction of gas bubbles with large diameters decreased; however, the fraction of bubbles with medium diameters increased. The obtained results clearly indicate that an increased solid density increased the bubble rise velocity up to a specified height and reduced the velocity at larger heights, in tapered fluidized beds. © 2017 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences
  5. Keywords:
  6. Apex angle ; Bubble size distribution ; Particle size and density ; Rise velocity of bubbles ; Tapered fluidized beds ; Bubble columns ; Bubbles (in fluids) ; Fluidization ; Gases ; Granular materials ; Particle size ; Size distribution ; Two phase flow ; Velocity ; Apex angles ; Behavior of gas bubbles ; Bubble rise velocity ; Bubble size distributions ; Kinetic theory of granular flow ; Numerical investigations ; Rise velocity ; Tapered fluidized bed ; Fluidized beds
  7. Source: Particuology ; 2017 ; 16742001 (ISSN)
  8. URL: https://www.sciencedirect.com/science/article/pii/S1674200117301438