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A review of multiscale CFD for gas–solid CFB modeling

Wang, Wei ; Lu, Bona ; Zhang, Nan ; Shi, Zhansheng ; Li, Jinghai

International Journal of Multiphase Flow, 2010, Vol.36(2), pp.109-118 [Periódico revisado por pares]

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  • Título:
    A review of multiscale CFD for gas–solid CFB modeling
  • Autor: Wang, Wei ; Lu, Bona ; Zhang, Nan ; Shi, Zhansheng ; Li, Jinghai
  • Assuntos: Meso-Scale ; Multiscale ; CFD ; Simulation ; Fluidized Bed ; Structure ; Mass Transfer ; Engineering ; Physics
  • É parte de: International Journal of Multiphase Flow, 2010, Vol.36(2), pp.109-118
  • Descrição: Meso-scale structure is of critical importance to circulating fluidized bed (CFB) applications. Computational fluid dynamics (CFD) with consideration of meso-scale structures can help understand the structure-oriented coupling between flow, heat/mass transfer and reactions. This article is to review our recent progress on the so-called multiscale CFD (MSCFD), which characterizes the sub-grid meso-scale structure with stability criteria in addition to conservation equations. It is found that the mesh-independent solution of fine-grid two-fluid model (TFM) without sub-grid structures is inexact, in the sense that it overestimates the drag coefficient and fails to capture the characteristic S-shaped axial profile of voidage in a CFB riser. By comparison, MSCFD approach in terms of EMMS/matrix seems to reach a mesh-independent solution of the sub-grid structure, and succeeds in predicting the axial profile and flow regime transitions. Further application of MSCFD finds that neglect...
  • Idioma: Inglês

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