Documents disponibles écrits par cet auteur

CFD simulation of the bubbling and slugging gas-solid fluidized beds / Seyyed Hossein Hosseini in Transactions of the ASME . Journal of fluids engineering, Vol. 132 N° 4 (Avril 2010) 

Public ISBD [article]  in Transactions of the ASME . Journal of fluids engineering > Vol. 132 N° 4 (Avril 2010) . - 10 p. Titre : CFD simulation of the bubbling and slugging gas-solid fluidized beds Type de document : texte imprimé Auteurs : Seyyed Hossein Hosseini, Auteur ; Wenqi Zhong, Auteur ; Mohsen Nasr Esfahany, Auteur Année de publication : 2010 Article en page(s) : 10 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : temperature;  particulate  matter;  drag  (fluid  dynamics);  simulation;  fluidization;  computational  fluid  dynamics;  equations;  errors;  fluidized  beds;  pressure  drop Résumé : A two-dimensional transient Eulerian model integrating the kinetic theory for emulsion phase is used to simulate the bubbling and slugging gas-solid fluidized beds, including the Geldart B and D particles, respectively. CFD results show that utilizing an algebraic granular temperature equation, instead of a full granular temperature, one leads to a significant reduction in computational time without loosing accuracy. Different drag models have been examined in the current study. CFD results show that the Syamlal–O’Brien and Di Felice adjusted drag models, based on minimum fluidization velocity, are not suitable for the bed, including coarse particles (Geldart group B). The Gidaspow drag model displays better results in comparison with the others. A good agreement with the available experimental data and the researcher’s findings has been reached quantitatively and qualitatively. The proposed model can reasonably be used for simulation of slugging fluidized beds. This study reduces the computational error compared with the previous works. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] CFD simulation of the bubbling and slugging gas-solid fluidized beds [texte imprimé] / Seyyed Hossein Hosseini, Auteur ; Wenqi Zhong, Auteur ; Mohsen Nasr Esfahany, Auteur . - 2010 . - 10 p. fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 132 N° 4 (Avril 2010) . - 10 p. Mots-clés : temperature;  particulate  matter;  drag  (fluid  dynamics);  simulation;  fluidization;  computational  fluid  dynamics;  equations;  errors;  fluidized  beds;  pressure  drop Résumé : A two-dimensional transient Eulerian model integrating the kinetic theory for emulsion phase is used to simulate the bubbling and slugging gas-solid fluidized beds, including the Geldart B and D particles, respectively. CFD results show that utilizing an algebraic granular temperature equation, instead of a full granular temperature, one leads to a significant reduction in computational time without loosing accuracy. Different drag models have been examined in the current study. CFD results show that the Syamlal–O’Brien and Di Felice adjusted drag models, based on minimum fluidization velocity, are not suitable for the bed, including coarse particles (Geldart group B). The Gidaspow drag model displays better results in comparison with the others. A good agreement with the available experimental data and the researcher’s findings has been reached quantitatively and qualitatively. The proposed model can reasonably be used for simulation of slugging fluidized beds. This study reduces the computational error compared with the previous works. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]

Experimental study of the effect of reflux rate during suspension polymerization on particle properties of PVC resin / Nasrin Etesami in Industrial & engineering chemistry research, Vol. 49 N° 5 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp.1997–2002 Titre : Experimental study of the effect of reflux rate during suspension polymerization on particle properties of PVC resin Type de document : texte imprimé Auteurs : Nasrin Etesami, Auteur ; Mohsen Nasr Esfahany, Auteur ; Roohollah Bagheri, Auteur Année de publication : 2010 Article en page(s) : pp.1997–2002 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Chemistry;  Particle  PVC;  Polymerization;  Resin Résumé : The particle morphological properties of poly(vinyl chloride) produced by suspension polymerization in a pilot-scale reactor under different reflux rates have been investigated. It was found that the monomer conversion decreased with increasing reflux rate. It was also observed that the cold plasticizer absorption (CPA) increased with reflux rate, whereas the bulk density (BD) and K value of the resin decreased. SEM micrographs showed that PVC resin with a rougher particle surface, more separate aggregates, and smaller primary particles was prepared at higher reflux rates. The particle size distribution determined by laser size analysis showed that the standard deviation of the particle size distribution and the mean particle size did not change significantly with reflux rate. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9008259 [article] Experimental study of the effect of reflux rate during suspension polymerization on particle properties of PVC resin [texte imprimé] / Nasrin Etesami, Auteur ; Mohsen Nasr Esfahany, Auteur ; Roohollah Bagheri, Auteur . - 2010 . - pp.1997–2002. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp.1997–2002 Mots-clés : Chemistry;  Particle  PVC;  Polymerization;  Resin Résumé : The particle morphological properties of poly(vinyl chloride) produced by suspension polymerization in a pilot-scale reactor under different reflux rates have been investigated. It was found that the monomer conversion decreased with increasing reflux rate. It was also observed that the cold plasticizer absorption (CPA) increased with reflux rate, whereas the bulk density (BD) and K value of the resin decreased. SEM micrographs showed that PVC resin with a rougher particle surface, more separate aggregates, and smaller primary particles was prepared at higher reflux rates. The particle size distribution determined by laser size analysis showed that the standard deviation of the particle size distribution and the mean particle size did not change significantly with reflux rate. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9008259