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Prediction of radial distribution function of particles in a gas-solid fluidized bed using discrete hard-sphere model / Shuyan Wang in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1343–1352 Titre : Prediction of radial distribution function of particles in a gas-solid fluidized bed using discrete hard-sphere model Type de document : texte imprimé Auteurs : Shuyan Wang, Auteur ; Liu Guodong, Auteur ; Huilin Lu, Auteur Année de publication : 2009 Article en page(s) : p. 1343–1352 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Gas-Solid  kinetic  theory Résumé : Flow behavior of particles in a two-dimensional bubbling fluidized bed is predicted by using discrete hard-sphere model for particle−particle collision. Quantities of radial distribution functions of monosized particles, binary-sized particles, and binary density particles are obtained. Experimentally or theoretically proposed formulations for the radial distribution functions are evaluated based on our numerically predicted results. For monosized particles, the simulated radial distribution functions are in agreement with computed results from both Bagnold equation (1954) and Ma and Ahmadi (1986) equation. For the binary mixture with the different diameters but identical density, the pair radial distribution functions proposed by Boublik (1970) and Mansoori et al. (1971) agree with simulated data. For binary mixture of different densities, a modified equation of the pair radial distribution function is proposed to correlate from our simulation results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8007049 [article] Prediction of radial distribution function of particles in a gas-solid fluidized bed using discrete hard-sphere model [texte imprimé] / Shuyan Wang, Auteur ; Liu Guodong, Auteur ; Huilin Lu, Auteur . - 2009 . - p. 1343–1352. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1343–1352 Mots-clés : Gas-Solid  kinetic  theory Résumé : Flow behavior of particles in a two-dimensional bubbling fluidized bed is predicted by using discrete hard-sphere model for particle−particle collision. Quantities of radial distribution functions of monosized particles, binary-sized particles, and binary density particles are obtained. Experimentally or theoretically proposed formulations for the radial distribution functions are evaluated based on our numerically predicted results. For monosized particles, the simulated radial distribution functions are in agreement with computed results from both Bagnold equation (1954) and Ma and Ahmadi (1986) equation. For the binary mixture with the different diameters but identical density, the pair radial distribution functions proposed by Boublik (1970) and Mansoori et al. (1971) agree with simulated data. For binary mixture of different densities, a modified equation of the pair radial distribution function is proposed to correlate from our simulation results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8007049

Simulation of flow behavior of particles in a liquid − solid fluidized bed / Shuyan Wang in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10116-10124 Titre : Simulation of flow behavior of particles in a liquid − solid fluidized bed Type de document : texte imprimé Auteurs : Shuyan Wang, Auteur ; Xiaoqi Li, Auteur ; Yanbo Wu, Auteur Année de publication : 2011 Article en page(s) : pp. 10116-10124 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Fluidized  bed  Fluidization Résumé : Understanding hydrodynamics of liquid—solid fluidized beds is crucial in proper scale-up and design of these reactors. Computational fluid dynamics (CFD) models have shown promise in gaining this understanding. In this paper, a two-dimensional CFD model, using an Eulerian—Eulerian two-fluid model incorporating the kinetic theory of granular flow, is used to describe the liquid—solid two-phase flow in a liquid—solid fluidized bed. The predicted pressure gradient data and concentrations are found to agree with experimental data published in the literature. Furthermore, the model is used to investigate the influences of the superficial liquid velocity and the sold particle size on the distribution of solids concentration. The simulation results showed that the solids concentration has a relatively uniform distribution and high bed expansion with the increase of liquid velocity and decrease of particles sizes. Solids mean axial velocities decrease with the decrease in superficial liquid velocity. The static bed height plays a minor role on the effect of velocity and concentration distribution in numerical simulations of liquid—solid bubbling fluidized beds. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23325835 [article] Simulation of flow behavior of particles in a liquid − solid fluidized bed [texte imprimé] / Shuyan Wang, Auteur ; Xiaoqi Li, Auteur ; Yanbo Wu, Auteur . - 2011 . - pp. 10116-10124. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10116-10124 Mots-clés : Fluidized  bed  Fluidization Résumé : Understanding hydrodynamics of liquid—solid fluidized beds is crucial in proper scale-up and design of these reactors. Computational fluid dynamics (CFD) models have shown promise in gaining this understanding. In this paper, a two-dimensional CFD model, using an Eulerian—Eulerian two-fluid model incorporating the kinetic theory of granular flow, is used to describe the liquid—solid two-phase flow in a liquid—solid fluidized bed. The predicted pressure gradient data and concentrations are found to agree with experimental data published in the literature. Furthermore, the model is used to investigate the influences of the superficial liquid velocity and the sold particle size on the distribution of solids concentration. The simulation results showed that the solids concentration has a relatively uniform distribution and high bed expansion with the increase of liquid velocity and decrease of particles sizes. Solids mean axial velocities decrease with the decrease in superficial liquid velocity. The static bed height plays a minor role on the effect of velocity and concentration distribution in numerical simulations of liquid—solid bubbling fluidized beds. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23325835

Simulation of performance of cracking reactions of particle clusters in fcc risers / Shuyan Wang in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4632-4640 Titre : Simulation of performance of cracking reactions of particle clusters in fcc risers Type de document : texte imprimé Auteurs : Shuyan Wang, Auteur ; He Yurong, Auteur ; Huilin Lu, Auteur ; Jianmian Ding, Auteur Année de publication : 2008 Article en page(s) : p. 4632-4640 Note générale : Bibliogr. p. 4639-4640 Langues : Anglais (eng) Mots-clés : Fluid  catalytic  cracking  riser;  Four-lump  mathematical  model;  Cluster Résumé : The behavior of catalytic cracking reactions of particle cluster in fluid catalytic cracking risers was numerically analyzed using a four-lump mathematical model. The effects of the cluster porosity, inlet gas velocity, and cluster formation on cracking reactions were investigated. Distributions of temperature, gases, and gasoline from both the catalyst particle cluster and an isolated catalyst particle are presented. Simulated results show that the reactions from vacuum gas oil (VGO) to gasoline, gas, and coke of individual particle in the cluster are slower than those of the isolated particle, but faster for the reaction from gasoline to gas and coke. Particle clustering will reduce the reaction rates from VGO to gasoline, gas, and coke and increase the reaction rates from gasoline to gas and coke. Less gasoline is produced by particle clustering. More gas and gasoline are produced for the downward moving cluster than for the upward moving cluster. The cluster formation decreases the reaction rates and reduces gas and gasoline production. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071305q [article] Simulation of performance of cracking reactions of particle clusters in fcc risers [texte imprimé] / Shuyan Wang, Auteur ; He Yurong, Auteur ; Huilin Lu, Auteur ; Jianmian Ding, Auteur . - 2008 . - p. 4632-4640. Bibliogr. p. 4639-4640 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4632-4640 Mots-clés : Fluid  catalytic  cracking  riser;  Four-lump  mathematical  model;  Cluster Résumé : The behavior of catalytic cracking reactions of particle cluster in fluid catalytic cracking risers was numerically analyzed using a four-lump mathematical model. The effects of the cluster porosity, inlet gas velocity, and cluster formation on cracking reactions were investigated. Distributions of temperature, gases, and gasoline from both the catalyst particle cluster and an isolated catalyst particle are presented. Simulated results show that the reactions from vacuum gas oil (VGO) to gasoline, gas, and coke of individual particle in the cluster are slower than those of the isolated particle, but faster for the reaction from gasoline to gas and coke. Particle clustering will reduce the reaction rates from VGO to gasoline, gas, and coke and increase the reaction rates from gasoline to gas and coke. Less gasoline is produced by particle clustering. More gas and gasoline are produced for the downward moving cluster than for the upward moving cluster. The cluster formation decreases the reaction rates and reduces gas and gasoline production. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071305q