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Extending the bubble-based EMMS model to CFB riser simulations

Hong, Kun ; Shi, Zhansheng ; Ullah, Atta ; Wang, Wei

Powder Technology, November 2014, Vol.266, pp.424-432 [Periódico revisado por pares]

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  • Título:
    Extending the bubble-based EMMS model to CFB riser simulations
  • Autor: Hong, Kun ; Shi, Zhansheng ; Ullah, Atta ; Wang, Wei
  • Assuntos: Circulating Fluidized Bed ; Multi-Scale Structure ; Bubble ; Emms ; Simulation ; Engineering
  • É parte de: Powder Technology, November 2014, Vol.266, pp.424-432
  • Descrição: Experiments have shown that various structures (e.g., the streamer, cluster, void and bubble) can be clearly observed in gas–solid fluidized beds. These structures affect the overall behavior of flow, mass/heat transfer and reactions significantly and should be accounted for in simulations of gas–solid flow. For the purpose of riser flow simulation, the structure-based drag model has already been proposed based on the description of meso-scale clusters, and incorporated into the framework of a two-fluid model to calculate the effective drag force. However, there is still no clear agreement about the characterization of clusters, such as the cluster shape, size and orientation. In contrast, it is easier to describe and measure the characteristic size of visible bubbles. Here, we attempt to upgrade the bubble-based EMMS model which was established for bubbling fluidized beds originally, and then extend it to simulations of heterogeneous gas–solid flows in CFB risers. Numerical analysis...
  • Idioma: Inglês

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