Journal
POWDER TECHNOLOGY
Volume 224, Issue -, Pages 1-11Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.powtec.2012.02.005
Keywords
Optical sensors; Downer units; CPFD simulation; Cluster particle velocity
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Funding
- Natural and Engineering Research Council (NSERC)
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The present study describes the potential intrusive effects of CREC-GS-Optiprobes on the flow pattern in gas-solid downflow units. Granular flows and their interactions with the CREC-GS-Optiprobes are calculated using a CPFD (Computational Particle Fluid Dynamic) numerical scheme in three dimensions, using particle clusters. Once particles dispersed in the column, the numerical simulations revealed that these particles formed a relatively homogeneous suspension with cluster formation and solids accelerating until reaching a fully-developed regime. CPFD simulations showed that two axially aligned CREC-GS-Optiprobes, when placed in the fully developed flow regime, introduce minimum perturbations in the gas-solid suspension. Therefore this CREC-GS-Optiprobe creates a highly illuminated focal region where hydrodynamic parameters can be measured without significant flow disturbance. Thus, this study supports the application of fiber optic probes; such as in the case of the CREC-GS-Optiprobes, which can provide undisturbed axial particle cluster velocity, axial cluster slip velocities, cluster size and solid fraction measurements at strategically selected locations in the gas-solid downer unit. (C) 2012 Elsevier B.V. All rights reserved.
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