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Computations of fluid dynamics of a 50 MWe circulating fluidized bed combustor / Liu Guodong 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. 5132–5140 Titre : Computations of fluid dynamics of a 50 MWe circulating fluidized bed combustor Type de document : texte imprimé Auteurs : Liu Guodong, Auteur ; Sun Dan, Auteur ; Huilin Lu, Auteur Année de publication : 2010 Article en page(s) : pp. 5132–5140 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Fluid  dynamics Résumé : Gas−particle two-phase turbulent flows are numerically studied in a 50 MWe circulating fluidized bed combustor. The dense flow of particles is modeled by the frictional stress models adopted from solid mechanics theory, and the dilute flow in the so-called rapid granular flow regime is modeled from the kinetic theory of granular flow. At low concentrations the viscosity due to the effect of the presence of particles is modeled by means of a semiempirical viscosity for fluidized catalytic cracking particles. The distribution of the velocity and concentration of particles in a circulating fluidized bed combustor is predicted. Simulations indicate that the dense regime with a high concentration of particles is in the bottom part and the dilute regime with a low concentration in the upper part of the furnace. The effect of secondary air on the flow behavior is analyzed, and the penetration length of the secondary air jet is computed in a 50 MWe circulating fluidized bed combustor. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901103t [article] Computations of fluid dynamics of a 50 MWe circulating fluidized bed combustor [texte imprimé] / Liu Guodong, Auteur ; Sun Dan, Auteur ; Huilin Lu, Auteur . - 2010 . - pp. 5132–5140. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5132–5140 Mots-clés : Fluid  dynamics Résumé : Gas−particle two-phase turbulent flows are numerically studied in a 50 MWe circulating fluidized bed combustor. The dense flow of particles is modeled by the frictional stress models adopted from solid mechanics theory, and the dilute flow in the so-called rapid granular flow regime is modeled from the kinetic theory of granular flow. At low concentrations the viscosity due to the effect of the presence of particles is modeled by means of a semiempirical viscosity for fluidized catalytic cracking particles. The distribution of the velocity and concentration of particles in a circulating fluidized bed combustor is predicted. Simulations indicate that the dense regime with a high concentration of particles is in the bottom part and the dilute regime with a low concentration in the upper part of the furnace. The effect of secondary air on the flow behavior is analyzed, and the penetration length of the secondary air jet is computed in a 50 MWe circulating fluidized bed combustor. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901103t

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