Simulation of particles and gas flow behavior in the riser section of a circulating fluidized bed using the kinetic theory approach for the particulate phase

Benyahia, Sofiane; Arastoopour, Hamid; Knowlton, T.M.; Massah, H.

doi:10.1016/s0032-5910(99)00302-2

Cited by 297 publications

(197 citation statements)

References 21 publications

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“…The simulation models applied for dilute flow can be verified and improved. Next, these models can be extended for more complex dense flows, where the interaction between gas turbulence on the one hand and particle fluctuations on the other hand becomes significant [10]. Thus, with the non-intrusive LDA measuring technique, providing accurate threecomponent solids velocity fields in dilute riser flow, valuable data can be obtained in view of better modeling.…”

Section: Introductionmentioning

confidence: 99%

Three-component solids velocity measurements in the middle section of a riser

Pantzali

Bayon

Heynderickx

et al. 2013

Chemical Engineering Science

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Coincident three-component experiments are conducted in a 8.7-m-high cylindrical riser (internal diameter 0.10 m) of a Pilot-Scale Cold-Flow Circulating Fluidized Bed set-up using two LDA probes. At heights close to the solids inlet, the flow is highly disturbed due to the asymmetrical position of both the air and solids inlets. A fully developed parabolic axial solids velocity field is observed at a height of 2.5 m. The radial and azimuthal solids velocity components are significantly smaller than the axial one and are close to zero. The velocity fluctuations in the flow direction are larger than in the other directions, showing that the flow is anisotropic. However, the radial and azimuthal velocity fluctuations are higher than the corresponding mean velocities. All fluctuating velocities are decreasing significantly with increasing riser height, i.e. as the flow becomes more developed. No average down-flow of solids is recorded, not even close to the wall, probably due to the very high dilution (ε s <0.2%) used in the presented work. The measured turbulent kinetic energy indicates that the flow is dominated by wall-particle rather than intra-particle collisions. The acquired data can be useful for validation of riser simulations.

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Section: Introductionmentioning

confidence: 99%

Three-component solids velocity measurements in the middle section of a riser

Pantzali

Bayon

Heynderickx

et al. 2013

Chemical Engineering Science

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“…The isothermal hydrodynamics of fluidised bed reactors has attracted attention for decades to understand the complex interactions between gas and particles (Berruti et al, 1995;Samuelsberg and Hjertager, 1995;Benyahia et al, 2000;Almuttahar and Taghipour, 2008;Goldschmidt et al, 2001;Armstrong et al, 010a). Computational models predicting the heat-transfer coefficient in bubbling fluidised beds have also been carried out (Patil et al, 2006;Schmidt and Renz, 2000;Kuipers et al, 1992;Armstrong et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Effects of limestone calcination on the gasification processes in a BFB coal gasifier

Armstrong

Luo

2011

Chemical Engineering Journal

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“…The KTGF approach was widely accepted as an essential constitutive model for particle flow [64]. The KTGF approach introduces the concept of granular temperature (solid fluctuating energy) of particles.…”

Section: Euler-euler Methodsmentioning

confidence: 99%