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Studies of Gas Velocity And Particles Size Effects on Fluidized Bed Hydrodynamics with Cfd Modeling and Experimental Investigation

Published online by Cambridge University Press:  05 May 2011

Mahdi Hamzehei ,
Hassan Rahimzadeh  and
Goodarz Ahmadi
Mahdi Hamzehei*
Affiliation:
Department of Mechanical Engineering, Islamic Azad University, Ahwaz Branch, Ahwaz, Iran
Hassan Rahimzadeh*
Affiliation:
Department of Mechanical Engineering, Amirkabir University of Technology, Tehran 15875–4413, Iran
Goodarz Ahmadi*
Affiliation:
Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY 13699–5725, USA
*
* Assistant Professor, corresponding author
** Professor
** Professor
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Abstract

With applying Computational Fluid Dynamics (CFD) techniques, hydrodynamics of a twodimensional non-reactive gas-solid fluidized bed reactor was investigated. A multi fluid Eulerian model incorporating the kinetic theory for solid particles was applied to simulate the unsteady state behavior of this reactor and momentum exchange coefficients were calculated by using the Syamlal-O'Brien drag functions. A suitable numerical method that employed finite volume method applied to discritize the equations. Simulation results also indicated that small bubbles were produced at the bottom of the bed. These bubbles collided with each other as they moved upwards forming larger bubbles. Also, solid particles diameter and superficial gas velocity effect on hydrodynamics were studied. Simulation results were compared with the experimental data in order to validate the CFD model. Pressure drops and bed expansion ratio as well as the qualitative Gas-Solid flow patterns predicted by the simulations were in good agreement with experimental measurements at superficial gas velocities higher than the minimum fluidization velocity. Furthermore, this comparison showed that the model can predict hydrodynamicsbehavior of gas solid fluidized bed reasonably well.

Keywords

Fluidized bedHydrodynamicsGas-Solid flowCFDExperiment.
Type
Articles
Information
Journal of Mechanics , Volume 26 , Issue 3 , September 2010 , pp. 267 - 278
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2010

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