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Filtered and heterogeneity-based subgrid modifications for gas-solid drag and solid stresses in bubbling fluidized beds

Schneiderbauer, Simon ; Pirker, Stefan

AIChE journal, 2014-03, Vol.60 (3), p.839-854 [Periódico revisado por pares]

New York: Blackwell Publishing Ltd

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  • Título:
    Filtered and heterogeneity-based subgrid modifications for gas-solid drag and solid stresses in bubbling fluidized beds
  • Autor: Schneiderbauer, Simon ; Pirker, Stefan
  • Assuntos: Bubbling ; bubbling fluidized bed ; Chemical engineers ; coarse-grid simulations ; Computational fluid dynamics ; Computer simulation ; Fluid dynamics ; Fluid flow ; Fluid mechanics ; Fluidized beds ; Friction ; Heterogeneity ; kinetic theory-based filtered two-fluid model ; Simulation ; Stresses ; subgrid drag modification ; subgrid stress modifications
  • É parte de: AIChE journal, 2014-03, Vol.60 (3), p.839-854
  • Notas: ArticleID:AIC14321
    istex:5970D064796BDD2809430175231CBB237E4477ED
    ark:/67375/WNG-3T4D6Q2R-5
    Christian-Doppler Research Association
    Austrian National Foundation for Research, Technology and Development
    Austrian Federal Ministry of Economy, Family and Youth
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Two different approaches to constitutive relations for filtered two‐fluid models (TFM) of gas–solid flows are deduced. The first model (Model A) is derived using systematically filtered results obtained from a highly resolved simulation of a bubbling fluidized bed. The second model (Model B) stems from the assumption of the formation of subgrid heterogeneities inside the suspension phase of fluidized beds. These approaches for the unresolved terms appearing in the filtered TFM are, then, substantiated by the corresponding filtered data. Furthermore, the presented models are verified in the case of the bubbling fluidized bed used to generate the fine grid data. The numerical results obtained on coarse grids demonstrate that the computed bed hydrodynamics is in fairly good agreement with the highly resolved simulation. The results further show that the contribution from the unresolved frictional stresses is required to correctly predict the bubble rise velocity using coarse grids. © 2013 American Institute of Chemical Engineers AIChE J, 60: 839–854, 2014
  • Editor: New York: Blackwell Publishing Ltd
  • Idioma: Inglês
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