Effect of Particle Shape on Hopper Discharge Rate PDF Download
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Author: Kuldeep Mamtani
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Languages : en
Pages :
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ABSTRACT: The discharge rates for granular materials of various shapes and sizes from a rectangular flat-bottomed hopper with a rectangular orifice at the base were measured and compared to those predicted by the correlations in the literature. The predicted discharge rates by modified Beverloo's correlation and Fowler and Glastonbury's correlation differed from the measured values for most spherical materials by less than 10%. Harmens's correlation predicted discharge rates in good agreement with the measured values for spherical materials larger than 1000 ... Modified Beverloo's correlation predicted discharge rates deviating by a maximum of 10% from the measured rates for non-spherical materials with an aspect ratio around unity and/or high roundness. However, the correlation significantly overestimated the actual discharge rates for materials with a high aspect ratio and/or low roundness and/or angular surface. Harmens's correlation also failed to accurately predict discharge rates for such materials, though it gave better predictions when compared to modified Beverloo's correlation.
Author: Kuldeep Mamtani
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
ABSTRACT: The discharge rates for granular materials of various shapes and sizes from a rectangular flat-bottomed hopper with a rectangular orifice at the base were measured and compared to those predicted by the correlations in the literature. The predicted discharge rates by modified Beverloo's correlation and Fowler and Glastonbury's correlation differed from the measured values for most spherical materials by less than 10%. Harmens's correlation predicted discharge rates in good agreement with the measured values for spherical materials larger than 1000 ... Modified Beverloo's correlation predicted discharge rates deviating by a maximum of 10% from the measured rates for non-spherical materials with an aspect ratio around unity and/or high roundness. However, the correlation significantly overestimated the actual discharge rates for materials with a high aspect ratio and/or low roundness and/or angular surface. Harmens's correlation also failed to accurately predict discharge rates for such materials, though it gave better predictions when compared to modified Beverloo's correlation.
Author: Byung-Hwan Chu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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ABSTRACT: Many industrial processes including food, mining, and pharmaceuticals involve handling mixtures of granular materials. The tendency of granular materials to segregate due to differences in particle properties such as, size, shape, and density negatively affects the process efficiency and product quality. Our study focused on segregation of particles in hopper flow with the following conditions: well-mixed initial fill, funnel flow, and cylindrical hopper geometry. Glass beads and steel shots in three particle sizes each are used to investigate the effect of size ratio and density difference on particle segregation. Also, to study the effect of particle shape on segregation of particles, crushed glass in two sizes is used. Results show that size-segregation patterns are initially fines-rich and then fines-depleted at the end of discharge. Segregation increases for larger particle size ratios and decreases for fines fractions that are above 10%. The extent of segregation for mixtures of crushed glasscrushed glass is not significantly different from spherical glass mixtures. Given the same size ratio, mixtures consisting of smaller particles show less segregation. The segregation trend due to density effects is initially rich in particles with the higher density and then rich in the particles with the lower density at the end of the discharge.
Author: Siqiang Wang
Publisher: Springer Nature
ISBN: 9819999278
Category : Technology & Engineering
Languages : en
Pages : 240
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Book Description
This book focuses on discrete element methods for arbitrarily shaped granular materials, including super-quadric models, spherical harmonic functions and level set methods, and numerical analysis of the flow characteristics of non-spherical granular materials. This book is used as a reference book for scientific researchers engaged in dynamic analysis of granular materials and optimal design of equipment structures in the fields of engineering mechanics, applied physics, mechanical engineering, and chemical engineering, as well as for graduate students or senior undergraduates of related majors in institutions of higher education.
Author: R. P. Chhabra
Publisher: Butterworth-Heinemann
ISBN: 0081012209
Category : Technology & Engineering
Languages : en
Pages : 874
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Book Description
Coulson and Richardson's Chemical Engineering: Volume 2A: Particulate Systems and Particle Technology, Sixth Edition, has been fully revised and updated to provide practitioners with an overview of chemical engineering, including clear explanations of theory and thorough coverage of practical applications, all supported by case studies. A worldwide team of contributors has pooled their experience to revise old content and add new content. The content has been updated to be more useful to practicing engineers. This complete reference to chemical engineering will support you throughout your career, as it covers every key chemical engineering topic. Fluid Flow, Heat Transfer and Mass Transfer has been developed from the series' volume 1, 6th edition. This volume covers the three main transport process of interest to chemical engineers: momentum transfer (fluid flow), heat transfer and mass transfer and the relationships between them. Particulate Systems and Particle Technology has been developed from the series' volume 2, 5th edition. This volume covers the properties of particulate systems, including the character of individual particles and their behavior in fluids. Sedimentation of particles, both singly and at high concentrations, flow in packed and fluidized beads and filtration are then examined. Separation Processes has been developed from the series' volume 2, 5th edition. This volume covers distillation and gas absorption, which illustrate applications of the fundamental principles of mass transfer. Several techniques—adsorption, ion exchange, chromatographic and membrane separations, and process intensification—are described. Chemical and Biochemical Reactors and Reaction Engineering has been developed from the series' volume 3, 3rd edition. - Features fully revised reference material converted from textbooks - Covers foundational to technical topics - Features emerging applications, numerical methods and computational tools
Author: R. J. Preston
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: M. C. Roco
Publisher: Butterworth-Heinemann
ISBN:
Category : Science
Languages : en
Pages : 1032
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Book Description
This book is a collection of 28 contributions on basic phenomena and advanced methods of investigation for particulate two-phase flow. Written by leading scientists in the field, this book covers new measurement methods, experimental results on particulate two-phase flow microstructure at low and large Reynolds numbers, micromechanical, probabilistic, and numerical simulations, as well as production of ultrafine particles via aerosols and colloids for materials with controlled microstructure. Each chapter is focused on the qualitative progress made in the field in the last several years and has an extensive review section and original results. This unique volume assembles information previously found only in journals and specialized publications. It is an invaluable reference for researchers and engineers from academia and industry.
Author: Roger James Preston
Publisher:
ISBN:
Category :
Languages : en
Pages : 191
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Book Description
PARTICLE SIZE, PARTICLE SHAPE, FLOW VELOCITY, FLUID FLOW, POWDERS, POROSITY, PACKED BEDS, PIPES, PARTICLE DENSITY, PARTICLE MIGRATION.
Author: Dietmar Schulze
Publisher: Springer Nature
ISBN: 3030767205
Category : Science
Languages : en
Pages : 625
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Book Description
The book concentrates on powder flow properties, their measurement and applications. These topics are explained starting from the interactions between individual particles up to the design of silos. A wide range of problems are discussed – such as flow obstructions, segregation, and vibrations. The goal is to provide a deeper understanding of the powder flow, and to show practical solutions.
Author: Xikui Li
Publisher: Springer
ISBN: 9811019266
Category : Science
Languages : en
Pages : 1414
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Book Description
This book presents the latest advances in Discrete Element Methods (DEM) and technology. It is the proceeding of 7th International Conference on DEM which was held at Dalian University of Technology on August 1 - 4, 2016. The subject of this book are the DEM and related computational techniques such as DDA, FEM/DEM, molecular dynamics, SPH, Meshless methods, etc., which are the main computational methods for modeling discontinua. In comparison to continua which have been already studied for a long time, the research of discontinua is relatively new, but increases dramatically in recent years and has already become an important field. This book will benefit researchers and scientists from the academic fields of physics, engineering and applied mathematics, as well as from industry and national laboratories who are interested in the DEM.
Author: Surendrakumar Shantilal Shah
Publisher:
ISBN:
Category :
Languages : en
Pages : 65
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