Documents disponibles écrits par cet auteur

Homogeneous fluidization of geldart D particles in a gas–solid fluidized bed with a frame impeller / Ying Han in Industrial & engineering chemistry research, Vol. 51 N° 50 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp 16482–16487 Titre : Homogeneous fluidization of geldart D particles in a gas–solid fluidized bed with a frame impeller Type de document : texte imprimé Auteurs : Ying Han, Auteur ; Jia-Jun Wang, Auteur ; Xue-Ping Gu, Auteur Année de publication : 2013 Article en page(s) : pp 16482–16487 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Particles  Gas  solid Résumé : The influence of agitation of a frame impeller on the fluidization performance of Geldart D particles is experimentally and numerically studied in a gas–solid stirred fluidized bed, using a three-dimensional (3D) unsteady computational fluid dynamics (CFD) simulation. The bed pressure drops obtained from simulations are in reasonable agreement with those measured with pressure transducers, which validates the CFD models. The experimental results of the pressure fluctuation and the simulated ones of the solid volume fraction distribution show that Geldart D particles can perform homogeneous fluidization in the presence of the impeller. The homogeneous fluidization regime expands as the minimum bubbling velocity increases with the agitation speed while the minimum fluidizing velocity remains unaffected. In addition, the uniformity of particle velocities that are distributed in the entire fluidized bed is also improved by the agitation of the frame impeller. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301574q [article] Homogeneous fluidization of geldart D particles in a gas–solid fluidized bed with a frame impeller [texte imprimé] / Ying Han, Auteur ; Jia-Jun Wang, Auteur ; Xue-Ping Gu, Auteur . - 2013 . - pp 16482–16487. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp 16482–16487 Mots-clés : Particles  Gas  solid Résumé : The influence of agitation of a frame impeller on the fluidization performance of Geldart D particles is experimentally and numerically studied in a gas–solid stirred fluidized bed, using a three-dimensional (3D) unsteady computational fluid dynamics (CFD) simulation. The bed pressure drops obtained from simulations are in reasonable agreement with those measured with pressure transducers, which validates the CFD models. The experimental results of the pressure fluctuation and the simulated ones of the solid volume fraction distribution show that Geldart D particles can perform homogeneous fluidization in the presence of the impeller. The homogeneous fluidization regime expands as the minimum bubbling velocity increases with the agitation speed while the minimum fluidizing velocity remains unaffected. In addition, the uniformity of particle velocities that are distributed in the entire fluidized bed is also improved by the agitation of the frame impeller. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301574q

Periodic switching of monomer additions for controlling the compositions and microstructures of segmented and random ethylene-propylene copolymers in polypropylene in-reactor alloys / Zhou Tian in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 5992-5999 Titre : Periodic switching of monomer additions for controlling the compositions and microstructures of segmented and random ethylene-propylene copolymers in polypropylene in-reactor alloys Type de document : texte imprimé Auteurs : Zhou Tian, Auteur ; Xue-Ping Gu, Auteur ; Gang-Liang Wu, Auteur Année de publication : 2011 Article en page(s) : pp. 5992-5999 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Reactor  Microstructure Résumé : This work aims at shading fundamental insights into mechanisms that dictate the composition and microstructure of polypropylene/poly(ethylene-co-propylene) (PP/EPR) in-reactor alloys produced by the multizone circulating reactor (MZCR) technology, a novel one for polyolefin production. For this purpose, this technology is simulated by a batch process with periodic switching of monomer additions. An increase in the switch frequency leads to a decrease in the fraction of ethylene/propylene random (amorphous) copolymers denoted as EPR and an increase in the fraction and the length of PP segments of ethylene/ propylene segmented (partially crystalline) copolymers denoted as EPS. Concomitantly, the size of the dispersed phase domains (EPR) decreases, and its size distribution becomes more uniform as a result of the decrease in the fraction of the EPR and the increase in that of the EPS which acts as a compatibilizer for PP/EPR in-reactor blends. Mechanical properties of the PP/EPR in-reactor blends are also discussed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158896 [article] Periodic switching of monomer additions for controlling the compositions and microstructures of segmented and random ethylene-propylene copolymers in polypropylene in-reactor alloys [texte imprimé] / Zhou Tian, Auteur ; Xue-Ping Gu, Auteur ; Gang-Liang Wu, Auteur . - 2011 . - pp. 5992-5999. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 5992-5999 Mots-clés : Reactor  Microstructure Résumé : This work aims at shading fundamental insights into mechanisms that dictate the composition and microstructure of polypropylene/poly(ethylene-co-propylene) (PP/EPR) in-reactor alloys produced by the multizone circulating reactor (MZCR) technology, a novel one for polyolefin production. For this purpose, this technology is simulated by a batch process with periodic switching of monomer additions. An increase in the switch frequency leads to a decrease in the fraction of ethylene/propylene random (amorphous) copolymers denoted as EPR and an increase in the fraction and the length of PP segments of ethylene/ propylene segmented (partially crystalline) copolymers denoted as EPS. Concomitantly, the size of the dispersed phase domains (EPR) decreases, and its size distribution becomes more uniform as a result of the decrease in the fraction of the EPR and the increase in that of the EPS which acts as a compatibilizer for PP/EPR in-reactor blends. Mechanical properties of the PP/EPR in-reactor blends are also discussed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158896