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 [...]

Prediction of the effective area in structured packings by computational fluid dynamics / Saeed Shojaee in Industrial & engineering chemistry research, Vol. 50 N° 18 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10833-10842 Titre : Prediction of the effective area in structured packings by computational fluid dynamics Type de document : texte imprimé Auteurs : Saeed Shojaee, Auteur ; Seyyed Hossein Hosseini, Auteur ; Arash Rafati, Auteur Année de publication : 2011 Article en page(s) : pp. 10833-10842 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Computational  fluid  dynamics  Ordered  packing  Prediction Résumé : Careful examination of the correlations for the effective interfadal area of the structured packed columns in the literature reveals considerable discrepancies in the estimated areas and the associated gas velocities. In this study, a volume of fluid multiphase-flow model for two adjacent sheets of a Gempak 2A structured packing was used to investigate the effect ofgas and liquid velocities on the effective area of the packing sheets. The three-dimensional computational fluid dynamic (CFD) results showed that the gas and liquid flow rates play significant roles in the effective interfacial area of the packed bed. In particular, the effective area increases as the flow rates of both phases increase. The simulation results were compared with the existing correlations for the effective area, and it was found that the Brunazzi model exhibits good agreement with the CFD results in comparison with the existing correlations. Using the CFD model, the minimum flow rate 109.8 m3/m2·h for which the entire surface covered by the liquid phase was determined The simulation results showed that the CFD can be used as an effective tool to provide information on the details of the gas and liquid flows in complex packing geometries. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24523900 [article] Prediction of the effective area in structured packings by computational fluid dynamics [texte imprimé] / Saeed Shojaee, Auteur ; Seyyed Hossein Hosseini, Auteur ; Arash Rafati, Auteur . - 2011 . - pp. 10833-10842. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10833-10842 Mots-clés : Computational  fluid  dynamics  Ordered  packing  Prediction Résumé : Careful examination of the correlations for the effective interfadal area of the structured packed columns in the literature reveals considerable discrepancies in the estimated areas and the associated gas velocities. In this study, a volume of fluid multiphase-flow model for two adjacent sheets of a Gempak 2A structured packing was used to investigate the effect ofgas and liquid velocities on the effective area of the packing sheets. The three-dimensional computational fluid dynamic (CFD) results showed that the gas and liquid flow rates play significant roles in the effective interfacial area of the packed bed. In particular, the effective area increases as the flow rates of both phases increase. The simulation results were compared with the existing correlations for the effective area, and it was found that the Brunazzi model exhibits good agreement with the CFD results in comparison with the existing correlations. Using the CFD model, the minimum flow rate 109.8 m3/m2·h for which the entire surface covered by the liquid phase was determined The simulation results showed that the CFD can be used as an effective tool to provide information on the details of the gas and liquid flows in complex packing geometries. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24523900