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Computational study of flow regimes in vertical pneumatic conveying / S. B. Kuang in Industrial & engineering chemistry research, Vol. 48 N° 14 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6846–6858 Titre : Computational study of flow regimes in vertical pneumatic conveying Type de document : texte imprimé Auteurs : S. B. Kuang, Auteur ; A. B. Yu, Auteur ; Z. S. Zou, Auteur Année de publication : 2009 Article en page(s) : pp. 6846–6858 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Pneumatic  conveying  Flow  regimes  Three-dimensional  numerical  study Résumé : Pneumatic conveying is an important technology in industries to transport bulk materials from one location to another. Different flow regimes have been observed in such a transportation process depending on operational conditions, but the underlying fundamentals are not clear. This paper presents a three-dimensional numerical study of vertical pneumatic conveying by a combined approach of discrete element model for particles and computational fluid dynamics for gas. The approach is verified by comparing the calculated and measured results in terms of particle flow pattern and gas pressure drop. It is shown that flow regimes usually encountered in vertical pneumatic conveying and their corresponding phase diagram can be reproduced. Then forces governing the behavior of particles, such as the particle−particle, particle−fluid, and particle−wall forces, are analyzed in detail. It is shown that the roles of these forces vary with flow regimes. A new phase diagram is proposed in terms of the key forces, which can successfully identify dilute-phase flow and dense-phase flow in vertical pneumatic conveying. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900230s [article] Computational study of flow regimes in vertical pneumatic conveying [texte imprimé] / S. B. Kuang, Auteur ; A. B. Yu, Auteur ; Z. S. Zou, Auteur . - 2009 . - pp. 6846–6858. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6846–6858 Mots-clés : Pneumatic  conveying  Flow  regimes  Three-dimensional  numerical  study Résumé : Pneumatic conveying is an important technology in industries to transport bulk materials from one location to another. Different flow regimes have been observed in such a transportation process depending on operational conditions, but the underlying fundamentals are not clear. This paper presents a three-dimensional numerical study of vertical pneumatic conveying by a combined approach of discrete element model for particles and computational fluid dynamics for gas. The approach is verified by comparing the calculated and measured results in terms of particle flow pattern and gas pressure drop. It is shown that flow regimes usually encountered in vertical pneumatic conveying and their corresponding phase diagram can be reproduced. Then forces governing the behavior of particles, such as the particle−particle, particle−fluid, and particle−wall forces, are analyzed in detail. It is shown that the roles of these forces vary with flow regimes. A new phase diagram is proposed in terms of the key forces, which can successfully identify dilute-phase flow and dense-phase flow in vertical pneumatic conveying. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900230s

Gas–solid flow and energy dissipation in inclined pneumatic conveying / S. B. Kuang in Industrial & engineering chemistry research, Vol. 51 N° 43 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14289–14302 Titre : Gas–solid flow and energy dissipation in inclined pneumatic conveying Type de document : texte imprimé Auteurs : S. B. Kuang, Auteur ; R. P. Zou, Auteur ; R. H. Pan, Auteur Année de publication : 2013 Article en page(s) : pp. 14289–14302 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Gas  solid Résumé : This article presents a numerical study of inclined pneumatic conveying using the combination of the discrete element model (DEM) for the particles and computational fluid dynamics (CFD) for the gas. In the numerical model, periodic boundary conditions (PBCs) are applied to both gas and particles in the conveying direction for computational efficiency. The validity of the model is first examined by comparing the calculated and measured results in terms of solids flow rate and gas pressure drop during pneumatic conveying with a pipeline inclination angle varying from 0° to 90°. On this basis, the effects of inclination angle, solids flow rate, and gas velocity on gas pressure are quantified. The contributions of different forces including the particle–wall friction force, particle gravitational force, and fluid–wall friction force to the pressure drop are examined. Finally, the energy dissipation as a result of interactions between particles, between particles and wall, between particles and fluid, between fluids, and between fluid and wall is studied in detail. The results show that the energy loss during steady-state inclined pneumatic conveying can mainly be attributed to particle–fluid energy dissipation, gravitational potential energy, particle–wall friction energy dissipation, and fluid–wall viscous energy dissipation. These energy dissipations vary significantly with inclination angle and flow regime. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301894d [article] Gas–solid flow and energy dissipation in inclined pneumatic conveying [texte imprimé] / S. B. Kuang, Auteur ; R. P. Zou, Auteur ; R. H. Pan, Auteur . - 2013 . - pp. 14289–14302. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14289–14302 Mots-clés : Gas  solid Résumé : This article presents a numerical study of inclined pneumatic conveying using the combination of the discrete element model (DEM) for the particles and computational fluid dynamics (CFD) for the gas. In the numerical model, periodic boundary conditions (PBCs) are applied to both gas and particles in the conveying direction for computational efficiency. The validity of the model is first examined by comparing the calculated and measured results in terms of solids flow rate and gas pressure drop during pneumatic conveying with a pipeline inclination angle varying from 0° to 90°. On this basis, the effects of inclination angle, solids flow rate, and gas velocity on gas pressure are quantified. The contributions of different forces including the particle–wall friction force, particle gravitational force, and fluid–wall friction force to the pressure drop are examined. Finally, the energy dissipation as a result of interactions between particles, between particles and wall, between particles and fluid, between fluids, and between fluid and wall is studied in detail. The results show that the energy loss during steady-state inclined pneumatic conveying can mainly be attributed to particle–fluid energy dissipation, gravitational potential energy, particle–wall friction energy dissipation, and fluid–wall viscous energy dissipation. These energy dissipations vary significantly with inclination angle and flow regime. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301894d

Numerical simulation of the in-line pressure jig unit in coal preparation / K. J. Dong in Minerals engineering, Vol. 23 N° 4 (Mars 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 4 (Mars 2010) . - pp. 301–312 Titre : Numerical simulation of the in-line pressure jig unit in coal preparation Type de document : texte imprimé Auteurs : K. J. Dong, Auteur ; S. B. Kuang, Auteur ; A. Vince, Auteur Année de publication : 2011 Article en page(s) : pp. 301–312 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Gravity  concentration  Classification  Coal  Computational  fluid  dynamics  Discrete  element  method Résumé : This paper presents a numerical study of the multiphase flow in an in-line pressure jig (IPJ), which is a high yield and high recovery gravity separation device widely used in ore processing but may have potential in coal preparation. The mathematical model is developed by use of the combined approach of computational fluid dynamics (CFD) for liquid flow and discrete element method (DEM) for particle flow. It is qualitatively verified by comparing the calculated and measured results under similar conditions. The effects of a few key variables, such as vibration frequency and amplitude, and the size and density of ragging particles, on the flow and separation performance of the IPJ are studied by conducting a series of simulations. The results are analyzed in terms of velocity field, porosity distribution and forces on particles. The findings would be helpful in the design, control and optimisation of an IPJ unit. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002635 [article] Numerical simulation of the in-line pressure jig unit in coal preparation [texte imprimé] / K. J. Dong, Auteur ; S. B. Kuang, Auteur ; A. Vince, Auteur . - 2011 . - pp. 301–312. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 4 (Mars 2010) . - pp. 301–312 Mots-clés : Gravity  concentration  Classification  Coal  Computational  fluid  dynamics  Discrete  element  method Résumé : This paper presents a numerical study of the multiphase flow in an in-line pressure jig (IPJ), which is a high yield and high recovery gravity separation device widely used in ore processing but may have potential in coal preparation. The mathematical model is developed by use of the combined approach of computational fluid dynamics (CFD) for liquid flow and discrete element method (DEM) for particle flow. It is qualitatively verified by comparing the calculated and measured results under similar conditions. The effects of a few key variables, such as vibration frequency and amplitude, and the size and density of ragging particles, on the flow and separation performance of the IPJ are studied by conducting a series of simulations. The results are analyzed in terms of velocity field, porosity distribution and forces on particles. The findings would be helpful in the design, control and optimisation of an IPJ unit. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002635