Documents disponibles écrits par cet auteur

Computational study of the effects of material properties on heat transfer in gas fluidization / Qin-Fu Hou in Industrial & engineering chemistry research, Vol. 51 N° 35 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11572-11586 Titre : Computational study of the effects of material properties on heat transfer in gas fluidization Type de document : texte imprimé Auteurs : Qin-Fu Hou, Auteur ; Zong-Yan Zhou, Auteur ; Ai-Bing Yu, Auteur Année de publication : 2012 Article en page(s) : pp. 11572-11586 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Fluidization  Heat  transfer  Properties  of  materials Résumé : Heat transfer characteristics of different powders in gas fluidization are investigated by means of a combined approach of discrete element method and computational fluid dynamics. First, the heat transfer characteristics in three flow regimes of group A powders are examined. Then, the effects of the Hamaker constant and particle size, both related to the van der Waals force, are investigated in detail. The results confirm that the convective heat transfer is dominant, and radiative heat transfer becomes important when the bed temperature is high. However, conductive heat transfer also plays a role depending on the flow regimes and material properties. Significant effects of the Hamaker constant and particle size are observed under certain conditions. Finally, an effort is made to quantify the effects of the Hamaker constant, particle size, and inlet gas velocity. The findings should be useful for better understanding and prediction of the heat transfer in gas fluidization. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26324808 [article] Computational study of the effects of material properties on heat transfer in gas fluidization [texte imprimé] / Qin-Fu Hou, Auteur ; Zong-Yan Zhou, Auteur ; Ai-Bing Yu, Auteur . - 2012 . - pp. 11572-11586. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11572-11586 Mots-clés : Fluidization  Heat  transfer  Properties  of  materials Résumé : Heat transfer characteristics of different powders in gas fluidization are investigated by means of a combined approach of discrete element method and computational fluid dynamics. First, the heat transfer characteristics in three flow regimes of group A powders are examined. Then, the effects of the Hamaker constant and particle size, both related to the van der Waals force, are investigated in detail. The results confirm that the convective heat transfer is dominant, and radiative heat transfer becomes important when the bed temperature is high. However, conductive heat transfer also plays a role depending on the flow regimes and material properties. Significant effects of the Hamaker constant and particle size are observed under certain conditions. Finally, an effort is made to quantify the effects of the Hamaker constant, particle size, and inlet gas velocity. The findings should be useful for better understanding and prediction of the heat transfer in gas fluidization. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26324808

Dynamic simulation of the packing of ellipsoidal particles / Zong-Yan Zhou in Industrial & engineering chemistry research, Vol. 50 N° 16 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9787-9798 Titre : Dynamic simulation of the packing of ellipsoidal particles Type de document : texte imprimé Auteurs : Zong-Yan Zhou, Auteur ; Rui-Ping Zou, Auteur ; David Pinson, Auteur Année de publication : 2011 Article en page(s) : pp. 9787-9798 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Modeling  Dynamic  model Résumé : This paper presents a numerical study of the packing of nonspherical particles by the use of the discrete element method. The shapes considered are oblate and prolate spheroids, with the aspect ratio varying from 0.1 to 7.0. It is shown that the predicted relationship between packing fraction and aspect ratio is consistent with those reported in the literature. Ellipsoids can pack more densely than spheres. The maximum packing fraction occurs at an aspect ratio of 0.6 for oblate spheroids, and 1.80 for prolate spheroids. The packing characteristics with aspect ratio are further analyzed in terms of structural parameters such as coordination number and radial distribution function. It is shown that ellipsoids with small or large aspect ratios tend to give a locally ordered structure. The results demonstrate that DEM provides a useful method to investigate the packing dynamics of ellipsoidal particles. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425225 [article] Dynamic simulation of the packing of ellipsoidal particles [texte imprimé] / Zong-Yan Zhou, Auteur ; Rui-Ping Zou, Auteur ; David Pinson, Auteur . - 2011 . - pp. 9787-9798. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9787-9798 Mots-clés : Modeling  Dynamic  model Résumé : This paper presents a numerical study of the packing of nonspherical particles by the use of the discrete element method. The shapes considered are oblate and prolate spheroids, with the aspect ratio varying from 0.1 to 7.0. It is shown that the predicted relationship between packing fraction and aspect ratio is consistent with those reported in the literature. Ellipsoids can pack more densely than spheres. The maximum packing fraction occurs at an aspect ratio of 0.6 for oblate spheroids, and 1.80 for prolate spheroids. The packing characteristics with aspect ratio are further analyzed in terms of structural parameters such as coordination number and radial distribution function. It is shown that ellipsoids with small or large aspect ratios tend to give a locally ordered structure. The results demonstrate that DEM provides a useful method to investigate the packing dynamics of ellipsoidal particles. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425225