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Title of article :
Downer reactor flow measurements using CREC-GS-Optiprobes
Author/Authors :
Abbasi، نويسنده , , Alireza and Islam، نويسنده , , Mohammad Ashraful and Ege، نويسنده , , Paul E. and de Lasa، نويسنده , , Hugo I.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
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Abstract :
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.
Keywords :
optical sensors , Downer units , CPFD simulation , Cluster particle velocity
Journal title :
Powder Technology
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