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Modelling of the dense fluidized bed of very small particles

Fede, Pascal and Ansart, Renaud and Simonin, Olivier and Lagarde, S. and Ronga, Isabelle Modelling of the dense fluidized bed of very small particles. (2013) In: 8th International Conference on Multiphase Flow - ICMF 2013, 26 May 2013 - 31 May 2013 (Jeju, Korea, Republic Of).

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Abstract

Nowadays the numerical simulation of a fluidized bed made of particles with a very small diameter (about a few microns) is challenging. Recently it has identified that the bad predictions of such fluidized bed come primary from an unadapted computational grids, generally too coarse. Indeed coarse grid is unable for capturing very small structures of solid appearing in such fluidized bed. But for performing numerical simulation with reasonable grid in terms cell size and, consequently, in terms of cell number it is possible to use a subgrid model for representing the effect of small structure on the large scale particle motion. In the present study we propose a posteriori test of a subgrid model for the drag in the case of 3-dimensional numerical simulation of an isothermal fluidized bed. The numerical predictions are compared with experimental pressure drop. The sensitivity with respect to the model constant is check as well as the effect of boundary condition for the solid phase. The results show that without the subgrid model all particles are entrained very quickly. In contrast, with the subgrid model, the behaviour of experimental dense fluidized bed is observed.

Item Type:Conference or Workshop Item (Paper)
HAL Id:hal-00921305
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:Other partners > AREVA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
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Deposited By: Pascal FEDE
Deposited On:20 Dec 2013 10:11

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