Gas-Solid Turbulent Flow in a Circulating Fluidized Bed Riser; Numerical Study of Binary Particle Mixtures

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He, Y. and Deen, N.G. and Sint Annaland van, M. and Kuipers, J.A.M. (2008) Gas-Solid Turbulent Flow in a Circulating Fluidized Bed Riser; Numerical Study of Binary Particle Mixtures. In: 9th International Conference on Circulating Fluidized Beds , May, 13 – 16, 2008, Hamburg.

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Abstract:A numerical simulation was performed on a turbulent gas-particle multi-phase flow
in a circulating fluidized bed riser based on a hard-sphere discrete particle model (DPM) for the
particle phase and the Navier-Stokes equations for the gas phase. The sub-grid scale stresses
(SGS) were modeled with the SGS model proposed by Vreman (2004). The model enables the
calculation of an arbitrary particle size distribution. In this work, binary mixtures of particles
with different diameters are used in the simulation. From the numerical results it is found that
the particles display a radial and axial diameter distribution. Small particles have a higher
vertical particle velocity than the large particles. With increasing superficial gas velocity, the
vertical particle velocity is increased. The average particle velocity and concentration vary both
in the radial and axial directions. Finally, the numerical results are compared with the
experimental and numerical results of Mathiesen et al (2000).
Item Type:Conference or Workshop Item
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Link to this item:http://purl.utwente.nl/publications/67406
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