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Numerical simulation of a periodic circulating fluidized bed of binary mixture of particles: Budget analysis

Chevrier, Solène and Fede, Pascal and Simonin, Olivier Numerical simulation of a periodic circulating fluidized bed of binary mixture of particles: Budget analysis. (2016) In: 9th International Conference on Multiphase Flow (ICMF 2016), 22 May 2016 - 27 May 2016 (Firenze, Italy).

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Abstract

Detailed sensitivity numerical studies have shown that the mesh cell-size may have a drastic effect on the modelling of circulating fluidized bed. Typically the cell-size must be of the order of few particle diameters to predict accurately the dynamical behaviour of a fluidized bed. Then the Euler-Euler numerical simulations of industrial processes are generally performed with grids too coarse to allow the prediction of the local segregation effects. A filtered approach is developed where the unknown terms, called sub-grid contributions,have to be modelled. Highly resolved simulations are used to develop the model. They consist of Euler-Euler simulations with grid refinement up to reach a mesh independent solution. Then spatial filters can be applied in order to measure each sub-grid contribution appearing in the theoretical filtered approach. Such kind of numerical simulation is very expensive and is restricted to very simple configurations. In the present study, highly resolved simulations are performed to investigate the sub-grid contributions in case of a binary particle mixture in a periodic circulating gas-solid fluidized bed. A budget analysis is carried out in order to understand and model the effect of sub-grid contribution on the hydrodynamic of polydisperse gas-solid circulating fluidized bed.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Thanks to the ICMF. This paper appears in : Proceedings of the 9th International Conference on Multiphase Flow (ICMF 2016).
HAL Id:hal-01715388
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Funders:
European Commission
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Deposited On:01 Feb 2018 17:25

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