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DEM simulation of cake formation in sedimentation and filtration / K. J. Dong in Minerals engineering, Vol. 22 N° 11 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 11 (Octobre 2009) . - pp. 921–930 Titre : DEM simulation of cake formation in sedimentation and filtration Type de document : texte imprimé Auteurs : K. J. Dong, Auteur ; R. P. Zou, Auteur ; R.Y. Yang, Auteur Année de publication : 2009 Article en page(s) : pp. 921–930 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Liquid–solid  separation  Sedimentation  Filtration  Particle  packing  Discrete  element  method Résumé : This paper presents a DEM study of cake formation and growth in sedimentation and filtration processes with constant flow rate or pressure. The liquid flow is assumed to be one-dimensional and the motion of particles is three-dimensional. Various forces are included to determine the motion of particles, including the particle–particle contact forces, the van der Waals force and the particle–fluid interactions such as buoyancy, drag and lift forces. The effects of the material properties of particles and liquid and the operational conditions are examined. The structures of cakes are also analysed and the relationship between cake porosity and interparticle force is quantified. The microscopic analysis demonstrates that these variables affect the process and the cake structures through their effects on the gravity or cohesive force, which competes in controlling the formation of a cake. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001010 [article] DEM simulation of cake formation in sedimentation and filtration [texte imprimé] / K. J. Dong, Auteur ; R. P. Zou, Auteur ; R.Y. Yang, Auteur . - 2009 . - pp. 921–930. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 11 (Octobre 2009) . - pp. 921–930 Mots-clés : Liquid–solid  separation  Sedimentation  Filtration  Particle  packing  Discrete  element  method Résumé : This paper presents a DEM study of cake formation and growth in sedimentation and filtration processes with constant flow rate or pressure. The liquid flow is assumed to be one-dimensional and the motion of particles is three-dimensional. Various forces are included to determine the motion of particles, including the particle–particle contact forces, the van der Waals force and the particle–fluid interactions such as buoyancy, drag and lift forces. The effects of the material properties of particles and liquid and the operational conditions are examined. The structures of cakes are also analysed and the relationship between cake porosity and interparticle force is quantified. The microscopic analysis demonstrates that these variables affect the process and the cake structures through their effects on the gravity or cohesive force, which competes in controlling the formation of a cake. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001010

Effect of slurry properties on particle motion in IsaMills / C.T. Jayasundara in Minerals engineering, Vol. 22 N° 11 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 11 (Octobre 2009) . - pp. 886–892 Titre : Effect of slurry properties on particle motion in IsaMills Type de document : texte imprimé Auteurs : C.T. Jayasundara, Auteur ; R.Y. Yang, Auteur ; B.Y. Guo, Auteur Année de publication : 2009 Article en page(s) : pp. 886–892 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Mineral  processing  Discrete  element  method  Computational  fluid  dynamics  IsaMill™  Stirred  mill Résumé : IsaMill™ is a high-speed stirred mill for a range of milling duties from ultra-fine to relatively coarse grinding in the mineral processing industry. This work investigated particle and slurry flow in a mill using a combined Discrete Element Method and Computational Fluid Dynamics (DEM-CFD) approach. Slurry properties, such as flow density and viscosity, were varied to study their effects on the flow properties in terms of flow velocity, power draw, collision frequency, collision energy and total impact energy. Significant differences were observed when slurry was introduced and other conditions unchanged. With increasing density, fluid and particle flows showed stronger circulation in the axial direction due to the larger drag forces. Increased relative velocity and interaction between particles with disc led to higher collision frequency and collision energy. Increase in flow viscosity limited particles from moving towards the outer wall and the particles were more dispersed due to the larger circulating velocity in the axial direction. The total impact energy of the media and power draw also increase with slurry density and viscosity. The developed model provides a useful framework for further analysis of particle–slurry interactions in IsaMills™. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001162 [article] Effect of slurry properties on particle motion in IsaMills [texte imprimé] / C.T. Jayasundara, Auteur ; R.Y. Yang, Auteur ; B.Y. Guo, Auteur . - 2009 . - pp. 886–892. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 11 (Octobre 2009) . - pp. 886–892 Mots-clés : Mineral  processing  Discrete  element  method  Computational  fluid  dynamics  IsaMill™  Stirred  mill Résumé : IsaMill™ is a high-speed stirred mill for a range of milling duties from ultra-fine to relatively coarse grinding in the mineral processing industry. This work investigated particle and slurry flow in a mill using a combined Discrete Element Method and Computational Fluid Dynamics (DEM-CFD) approach. Slurry properties, such as flow density and viscosity, were varied to study their effects on the flow properties in terms of flow velocity, power draw, collision frequency, collision energy and total impact energy. Significant differences were observed when slurry was introduced and other conditions unchanged. With increasing density, fluid and particle flows showed stronger circulation in the axial direction due to the larger drag forces. Increased relative velocity and interaction between particles with disc led to higher collision frequency and collision energy. Increase in flow viscosity limited particles from moving towards the outer wall and the particles were more dispersed due to the larger circulating velocity in the axial direction. The total impact energy of the media and power draw also increase with slurry density and viscosity. The developed model provides a useful framework for further analysis of particle–slurry interactions in IsaMills™. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001162