Mutiscale Modeling Of Segregation In Granular Flows
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Multiscale Modeling Of Segregation In Granular Flows
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Author : Jin Sun
language : en
Publisher:
Release Date : 2007
Multiscale Modeling Of Segregation In Granular Flows written by Jin Sun and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Mutiscale Modeling Of Segregation In Granular Flows
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Author :
language : en
Publisher:
Release Date : 2007
Mutiscale Modeling Of Segregation In Granular Flows written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Modeling and simulation of segregation phenomena in granular flows are investigated. Computational models at different scales ranging from particle level (microscale) to continuum level (macroscale) are employed in order to determine the important microscale physics relevant to macroscale modeling. The capability of a multi-fluid model to capture segregation caused by density difference is demonstrated by simulating grain-chaff biomass flows in a laboratory-scale air column and in a combine harvester. The multi-fluid model treats gas and solid phases as interpenetrating continua in an Eulerian frame. This model is further improved by incorporating particle rotation using kinetic theory for rapid granular flow of slightly frictional spheres. A simplified model is implemented without changing the current kinetic theory framework by introducing an effective coefficient of restitution to account for additional energy dissipation due to frictional collisions. The accuracy of predicting segregation rate in a gas-fluidized bed is improved by the implementation. This result indicates that particle rotation is important microscopic physics to be incorporated into the hydrodynamic model. Segregation of a large particle in a dense granular bed of small particles under vertical. vibration is studied using molecular dynamics simulations. Wall friction is identified as a necessary condition for the segregation. Large-scale force networks bearing larger-than-average forces are found with the presence of wall friction. The role of force networks in assisting rising of the large particle is analyzed. Single-point force distribution and two-point spatial force correlation are computed. The results show the heterogeneity of forces and a short-range correlation. The short correlation length implies that even dense granular flows may admit local constitutive relations. A modified minimum spanning tree (MST) algorithm is developed to asymptotically recover the force statistics in the force networks. This algorithm provides a possible route to constructing a continuum model with microstructural information supplied from it. Microstructures in gas fluidized beds are also analyzed using a hybrid method, which couples the discrete element method (DEM) for particle dynamics with the averaged two-fluid (TF) equations for the gas phase. Multi-particle contacts are found in defluidized regions away from bubbles in fluidized beds. The multi-particle contacts invalidate the binary-collision assumption made in the kinetic theory of granular flows for the defluidized regions. Large ratios of contact forces to drag forces are found in the same regions, which confirms the relative importance of contact forces in determining particle dynamics in the defluidized regions.
Multiscale Modeling In Granular Flow
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Author :
language : en
Publisher:
Release Date : 2005
Multiscale Modeling In Granular Flow written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
By Christopher Harley Rycroft.
Multiscale Modelling And Simulation Of Rapid Granular Flows
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Author : Birte Domnik
language : en
Publisher:
Release Date : 2013
Multiscale Modelling And Simulation Of Rapid Granular Flows written by Birte Domnik and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Modelling Size Segregation In Dense Granular Flows
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Author : Parmesh Gajjar
language : en
Publisher:
Release Date : 2016
Modelling Size Segregation In Dense Granular Flows written by Parmesh Gajjar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
From Multiscale Modeling To Meso Science
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Author : Jinghai Li
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-22
From Multiscale Modeling To Meso Science written by Jinghai Li and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-22 with Technology & Engineering categories.
Multiscale modeling is becoming essential for accurate, rapid simulation in science and engineering. This book presents the results of three decades of research on multiscale modeling in process engineering from principles to application, and its generalization for different fields. This book considers the universality of meso-scale phenomena for the first time, and provides insight into the emerging discipline that unifies them, meso-science, as well as new perspectives for virtual process engineering. Multiscale modeling is applied in areas including: multiphase flow and fluid dynamics chemical, biochemical and process engineering mineral processing and metallurgical engineering energy and resources materials science and engineering Jinghai Li is Vice-President of the Chinese Academy of Sciences (CAS), a professor at the Institute of Process Engineering, CAS, and leader of the EMMS (Energy-minimizing multiscale) Group. Wei Ge, Wei Wang, Ning Yang and Junwu Wang are professors at the EMMS Group, part of the Institute of Process Engineering, CAS. Xinhua Liu, Limin Wang, Xianfeng He and Xiaowei Wang are associate professors at the EMMS Group, part of the Institute of Process Engineering, CAS. Mooson Kwauk is an emeritus director of the Institute of Process Engineering, CAS, and is an advisor to the EMMS Group.
Iutam Symposium On Multiscale Modeling And Characterization Of Elastic Inelastic Behavior Of Engineering Materials
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Author : S. Ahzi
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-04-17
Iutam Symposium On Multiscale Modeling And Characterization Of Elastic Inelastic Behavior Of Engineering Materials written by S. Ahzi and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-04-17 with Technology & Engineering categories.
The papers in this proceeding are a collection of the works presented at the IUTAM symposium-Marrakech 2002 (October 20-25) which brought together scientists from various countries. These papers cover contemporary topics in multiscale modeling and characterization of materials behavior of engineering materials. They were selected to focus on topics related to deformation and failure in metals, alloys, intermetallics and polymers including: experimental techniques, deformation and failure mechanisms, dislocation-based modelling, microscopic-macroscopic averaging schemes, application to forming processes and to phase transformation, localization and failure phenomena, and computational advances. Key areas that are covered by some of the papers include modeling of material deformation at various scales. At the atomistic scale, results from MD simulations pertaining to deformation mechanisms in nano-crystalline materials as well as dislocation-defect interactions are presented. Advances in modeling of deformation in metals using discrete dislocation analyses are also presented, providing an insight into this emerging scientific technique that can be used to model deformation at the microscale. These papers address current engineering problems, including deformation of thin fIlms, dislocation behavior and strength during nanoindentation, strength in metal matrix composites, dislocation-crack interaction, development of textures in polycrystals, and problems involving twining and shape memory behavior. On Behalf of the organizing committee, I would like to thank Professor P.
Multi Scale Multiphase Modelling Of Granular Flows
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Author : Krishna Kumar Soundararajan
language : en
Publisher:
Release Date : 2015
Multi Scale Multiphase Modelling Of Granular Flows written by Krishna Kumar Soundararajan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Iutam Symposium On Multiscale Modelling Of Damage And Fracture Processes In Composite Materials
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Author : Tomasz Sadowski
language : en
Publisher: Springer Science & Business Media
Release Date : 2006-07-06
Iutam Symposium On Multiscale Modelling Of Damage And Fracture Processes In Composite Materials written by Tomasz Sadowski and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-07-06 with Science categories.
Integrating macroscopic properties with observations at lower levels, this book details advances in multiscale modelling and analysis pertaining to classes of composites which either have a wider range of relevant microstructural scales, such as metals, or do not have a very well-defined microstructure, e.g. cementitious or ceramic composites. The IUTAM symposia proceedings provide a platform for extensive further discussion and research.
Handbook Of Environmental Fluid Dynamics Two Volume Set
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Author : Harindra Joseph Fernando
language : en
Publisher: CRC Press
Release Date : 2012-12-11
Handbook Of Environmental Fluid Dynamics Two Volume Set written by Harindra Joseph Fernando and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-11 with Science categories.
With major implications for applied physics, engineering, and the natural and social sciences, the rapidly growing area of environmental fluid dynamics focuses on the interactions of human activities, environment, and fluid motion. A landmark for the field, this two-volume Handbook of Environmental Fluid Dynamics presents the basic principles, fund