Segregation Of Granular Particles In Suspension Flow
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Segregation Of Granular Particles In Suspension Flow
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Author : Jessica Tsay
language : en
Publisher:
Release Date : 2004
Segregation Of Granular Particles In Suspension Flow written by Jessica Tsay and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
An experiment was conducted to investigate the development of longitudinal stripes of granular particles due to instabilities in particle suspension flow. Research was conducted to characterize environmental phenomena related to granular flows, namely avalanches, mudslides, and the movement of glaciers. Results show the stripes were found to appear with a particle concentration of 10% by volume at angles of 20 degrees, at a particle concentration of 20% and 30% by volume at 20, 30, and 40 degrees, and at a particle concentration for 40% by volume at 20 degrees. The application of a shear stress intensified the development of the instabilities, and in experimental trials where stripes were not initially seen, the application of a shear stress was able to induce the fluid to develop the instability.
Flow Dynamics And Segregation Of Dry Granular Materials And Slurries
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Author : Nitin Jain
language : en
Publisher:
Release Date : 2004
Flow Dynamics And Segregation Of Dry Granular Materials And Slurries written by Nitin Jain and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Granular flows and segregation are important in a wide range of industrial and geological situations varying from mixing powders and formulation for pharmaceutical industries to landslides. The goal of this work is to better understand both the flow dynamics and the segregation in granular materials using a prototypical system---a quasi-2D rotating tumbler. Both dry granular matter and wet granular matter (slurries) are considered. Particle Image Velocimetry (PIV) coupled with Particle Tracking Velocimetry (PTV) is used to measure the dynamics in the flowing layer to investigate the effect of the interstitial fluid. Under slurry conditions the flowing layer thickness and the angle of repose are higher than the dry counterpart for the same sized beads tumbled at the same angular velocity. However, the surface velocity and shear rate are smaller when the interstitial fluid is a liquid rather than air. The velocity profile is nearly linear throughout the layer except for a region near the fixed bed where the velocity profile is logarithmic. Experiments on granular segregation in a circular tumbler reveal that for particle size and density combinations where percolation and buoyancy both contribute to segregation, either radial streaks or a "classical" core can occur, depending on the particle size ratio. Mixing is observed instead of segregation when the denser beads are larger than the lighter beads so that the ratio of particle sizes is greater than the ratio of particle densities. Changes in the tumbler shape introduce chaos in the system and causes segregation patterns to differ significantly in shape. Regardless of the differences in the shape of segregation pattern for these tumblers, the final mixing efficiency predominantly depends on the particle parameters.
Segregation Of A Binary Mixture Of Granular Particles
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Author : Kook-Young Yoon
language : en
Publisher:
Release Date : 2006
Segregation Of A Binary Mixture Of Granular Particles written by Kook-Young Yoon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Iutam Symposium On Segregation In Granular Flows
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Author : Anthony D. Rosato
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-04-17
Iutam Symposium On Segregation In Granular Flows written by Anthony D. Rosato 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.
Segregation is a pervasive phenomenon whereby a flowing granular mass consisting of particles with diverse physical properties becomes spatially inhomogeneous. In the industrial sector that deals with the handling and processing of bulk solids, this non-uniformity is highly undesirable since blend homogeneity is generally a stringent requirement of most products. In the arena of geophysical flows, segregation can enhance the destructive capabilities of natural events such as avalanches and landslides. During the last 15 years, these issues have provided motivation and fostered collaborations between the communities of mathematicians, engineers, industrial researchers, and physicists to develop predictive models of segregation by integrating the perspectives and approaches of each. The collection of unique papers brings to light many of the perplexing scientific and technical issues in our current understanding of this complex phenomenon. It addresses advances in experiment, computational modeling and theory. This volume is one of the very few books devoted entirely to problems of segregation of particulate solids.
Particle Size Segregation In Dense Granular Flows
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Author : Kasper Van der Vaart
language : en
Publisher:
Release Date : 2016
Particle Size Segregation In Dense Granular Flows written by Kasper Van der Vaart 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.
Mots-clés de l'auteur: Granular flows ; Particle-size segregation ; Particle-scale dynamics ; Non-intrusive imaging ; Asymmetric behaviour.
Segregation In Vibrated Granular Systems
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Author : Anthony D. Rosato
language : en
Publisher: Academic Press
Release Date : 2020-06-05
Segregation In Vibrated Granular Systems written by Anthony D. Rosato and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-06-05 with Technology & Engineering categories.
Segregation in Vibrated Granular Systems explains the individual mechanisms that influence the segregation of granular media under vibration, along with their interactions. Drawing on research from a wide range of academic disciplines, the book focuses on vibrated granular systems that are used in industry, providing a guide that will solve practical problems and help researchers. The applications of vibration-based segregation in industries, including pharmaceuticals, mining, food and chemical processing are all investigated with appropriate examples. In addition, relevant theory behind the behavior of granular media and segregation processes is explained, along with investigations of the technologies and techniques used. Analyzes all phenomena involved in the vibration-based segregation of bulk solids, including those relating to size, material properties and shape Explores how different segregation mechanisms interact Compares different technologies for investigating granular media, including PIV, MRI and X-ray tomography Explains how to use computational techniques to model the behavior of granular media, including DM, CFD and FEM
Controlling Mixing And Segregation In Time Periodic Granular Flows
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Author : Tathagata Bhattacharya
language : en
Publisher:
Release Date : 2016-05-14
Controlling Mixing And Segregation In Time Periodic Granular Flows written by Tathagata Bhattacharya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-05-14 with categories.
Interfacial Separation Of Particles
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Author : Shouci Lu
language : en
Publisher: Elsevier
Release Date : 2005-01-25
Interfacial Separation Of Particles written by Shouci Lu and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-01-25 with Technology & Engineering categories.
Interfacial Separation of Particles is concerned with the processing and separation of fine solid particles in liquid solutions using interfacial technology.Interfacial separation has been finding wide application in many industrial fields, such as pigment and filler production, mineral processing, environmental protection, hydrometallurgy, bioengineering, food and beverage industry and chemical industry. This book describes all interfacial separation techniques and discusses the general and specific fundamentals of the techniques. The book intends to promote theoretical understanding and the more promising developments of interfacial separation technology whilst broadening the reader's background knowledge of industrial suspensions. * Is clearly written based on strong systematic science fundamentals* Provides comprehensive coverage on particle technology, mineral processing and water treatment* Includes practical examples from the different industrial fields
Granular Flow Segregation And Agglomeration In Bladed Mixers
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Author : Brenda Remy
language : en
Publisher:
Release Date : 2010
Granular Flow Segregation And Agglomeration In Bladed Mixers written by Brenda Remy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Granular materials categories.
A large number of industrial processes involve the transport, mixing and storage of particulate systems. While prevalent in industry, particulate processes are commonly plagued by problems due to the complex rheology of these systems. In this work, the behavior of granular materials in a bladed mixer, an industrially relevant geometry, was investigated using computational and experimental techniques. Experimental flows were characterized via Particle Image Velocimetry and image analysis. Discrete element simulations were carried out to examine the effect of a wide range of system parameters. Particulate flows in bladed mixers were found to be periodic with complex flow patterns developing throughout the particle bed. Cohesionless flows were initially studied. For monodisperse flows, two distinct flow regimes were observed: a quasi-static regime where blade speed provides the time scale for momentum transfer and an intermediate regime where stresses scale linearly with blade speed. Particle and wall roughness were found to significantly affect bladed mixer flows. Systems with higher roughness are characterized by enhanced particle motion and mixing. Simple scaling relationships were observed for monodisperse flows in the quasi-static regime. Particle velocities and diffusivities were found to scale linearly with mixer size and blade speed, while stresses scaled linearly with particle bed weight. In polydisperse flows, size segregation was found to occur due to sieving. However, it was found that the extent of segregation can be reduced by introducing intermediate particle sizes in between the smallest and largest particles. Finally, wet particle flows were examined. At low moisture contents, enhanced particle velocities and mixing kinetics were observed in comparison to dry flows. However, at higher moisture contents, particle velocities and mixing rates were observed to decrease. Wet particle flows were characterized by the formation of particle agglomerates. Agglomerate formation led to an increase in particle bed roughness which significantly influenced macroscopic and microscopic flow properties. These findings contribute to the understanding of granular behavior in complex systems. Improved understanding of granular flows will enable the development of first-principles based models which can assist in the design and scale-up of bladed mixer operations and the identification of critical processes parameters.
Suspensions Of Granular Particles Generated By Upward Flow
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Author : Francis Clay McMichael
language : en
Publisher:
Release Date : 1963
Suspensions Of Granular Particles Generated By Upward Flow written by Francis Clay McMichael and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with categories.