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Computational and experimental study of heat transfer and hydrodynamics in a 2D gas − solid fluidized bed reactor / Mahdi Hamzehei in Industrial & engineering chemistry research, Vol. 49 N° 11 (Juin 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5110–5121 Titre : Computational and experimental study of heat transfer and hydrodynamics in a 2D gas − solid fluidized bed reactor Type de document : texte imprimé Auteurs : Mahdi Hamzehei, Auteur ; Hassan Rahimzadeh, Auteur ; Goodarz Ahmadi, Auteur Année de publication : 2010 Article en page(s) : pp. 5110–5121 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Heat  Transfer  Hydrodynamics. Résumé : The heat transfer and hydrodynamics of a two-dimensional nonreactive gas−solid fluidized bed reactor were studied experimentally and computationally. A multifluid Eulerian computational model incorporating the kinetic theory for solid particles coupled with the k−ε turbulence model was developed and used to simulate the heat conducting gas−solid flows in a fluidized bed configuration. Momentum exchange coefficients were evaluated using the Syamlal−O’Brien, Gidaspow, and Cao−Ahmadi drag functions. Temperature distributions of different phases in the reactor were also computed. Good agreement was found between the model predictions and the experimentally obtained data for the bed expansion ratio as well as the qualitative gas−solid flow patterns. The simulation and experimental results showed that the gas temperature decreases as it moves upward in the reactor, while the solid particle temperature increases. Pressure drop and temperature distribution predicted by the simulations were in good agreement with the experimental measurements at superficial gas velocities higher than the minimum fluidization velocity. Also, the predicted time-average local voidage profiles were in reasonable agreement with the experimental results. The study showed that the computational model was capable of predicting the heat-transfer and the hydrodynamic behavior of gas−solid fluidized bed flows with reasonable accuracy. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900510a [article] Computational and experimental study of heat transfer and hydrodynamics in a 2D gas − solid fluidized bed reactor [texte imprimé] / Mahdi Hamzehei, Auteur ; Hassan Rahimzadeh, Auteur ; Goodarz Ahmadi, Auteur . - 2010 . - pp. 5110–5121. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5110–5121 Mots-clés : Heat  Transfer  Hydrodynamics. Résumé : The heat transfer and hydrodynamics of a two-dimensional nonreactive gas−solid fluidized bed reactor were studied experimentally and computationally. A multifluid Eulerian computational model incorporating the kinetic theory for solid particles coupled with the k−ε turbulence model was developed and used to simulate the heat conducting gas−solid flows in a fluidized bed configuration. Momentum exchange coefficients were evaluated using the Syamlal−O’Brien, Gidaspow, and Cao−Ahmadi drag functions. Temperature distributions of different phases in the reactor were also computed. Good agreement was found between the model predictions and the experimentally obtained data for the bed expansion ratio as well as the qualitative gas−solid flow patterns. The simulation and experimental results showed that the gas temperature decreases as it moves upward in the reactor, while the solid particle temperature increases. Pressure drop and temperature distribution predicted by the simulations were in good agreement with the experimental measurements at superficial gas velocities higher than the minimum fluidization velocity. Also, the predicted time-average local voidage profiles were in reasonable agreement with the experimental results. The study showed that the computational model was capable of predicting the heat-transfer and the hydrodynamic behavior of gas−solid fluidized bed flows with reasonable accuracy. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900510a