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Instability And Segregation In Bounded Gas Particle And Granular Flows

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Instability And Segregation In Bounded Gas Particle Fluidized Beds And Granular Flows

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Author : Xue Liu
language : en
Publisher:
Release Date : 2006

Instability And Segregation In Bounded Gas Particle Fluidized Beds And Granular Flows written by Xue Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Gas flow categories.

Finally, we extend our work to investigate the steady state solutions of boundary-driven and body-force-driven granular flows and gas-particle fluidized beds with a bi-disperse particle mixture. Granular energy equipartition breaks down with an increase in the system inelasticity and the mass ratio, whereas the effect of the size ratio is very small if the two particle species have the same mass. The segregation of total particles and each individual particle species is enhanced when the effect of non-equipartition of granular energy is considered. The species segregation is enhanced with a decrease in the system elasticity, an increase in the average solids fraction or an increase in the size ratio, due to the competition of three diffusion forces: the thermal diffusion force, the ordinary diffusion force and the pressure diffusion force. For gas-particle fluidized beds and granular flows in a channel, we find that for the kinetic theory models used in the present study, the solids fraction and the granular temperature profiles are quite similar.

Instability And Segregation In Bounded Gas Particle And Granular Flows

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Author : Xue Liu
language : de
Publisher: VDM Publishing
Release Date : 2008

Instability And Segregation In Bounded Gas Particle And Granular Flows written by Xue Liu and has been published by VDM Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Science categories.

Fluid-particle and granular flows exhibit rather complex behavior, for example, the occurrence of bubbles and clusters in gas-particle flows, and clogging and size segregation in granular flows. This work is to advance our understanding of granular and gas particle flows using computational simulations. In gas-particle fluidized beds, confined between parallel solid walls, non-uniform solids distribution is observed and the flow profiles are strongly related to the physical and operating parameters, such as particle inelasticity, gravity, bed width and mean solids fraction. A stability analysis has been carried out to investigate the instabilities in gas-particle flows and the generation of cluster, bubbles or streamers in gas-fluidized beds. For boundary driven and body-force-driven granular flows and gas-particle fluidized beds with polydisperse particle mixtures, the particle species segregation is enhanced with a decrease in the system elasticity, an increase in the average solids fraction or an increase in the size ratio, due to the competition of diffusion forces. The distribution of granular energy and its effect on the segregation is also considered in this work.

Instability And Segregation In Bounded Particulate Shear Flows

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Author : Stephen L. Conway
language : en
Publisher:
Release Date : 2004

Instability And Segregation In Bounded Particulate Shear Flows written by Stephen L. Conway 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 Gaseous Flows

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Author : Vicente Garzó
language : en
Publisher:
Release Date : 2019

Granular Gaseous Flows written by Vicente Garzó and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with SCIENCE categories.

This book addresses the study of the gaseous state of granular matter in the conditions of rapid flow caused by a violent and sustained excitation. In this regime, grains only touch each other during collisions and hence, kinetic theory is a very useful tool to study granular flows. The main difference with respect to ordinary or molecular fluids is that grains are macroscopic and so, their collisions are inelastic. Given the interest in the effects of collisional dissipation on granular media under rapid flow conditions, the emphasis of this book is on an idealized model (smooth inelastic hard spheres) that isolates this effect from other important properties of granular systems. In this simple model, the inelasticity of collisions is only accounted for by a (positive) constant coefficient of normal restitution. The author of this monograph uses a kinetic theory description (which can be considered as a mesoscopic description between statistical mechanics and hydrodynamics) to study granular flows from a microscopic point of view. In particular, the inelastic version of the Boltzmann and Enskog kinetic equations is the starting point of the analysis. Conventional methods such as Chapman-Enskog expansion, Grad's moment method and/or kinetic models are generalized to dissipative systems to get the forms of the transport coefficients and hydrodynamics. The knowledge of granular hydrodynamics opens up the possibility of understanding interesting problems such as the spontaneous formation of density clusters and velocity vortices in freely cooling flows and/or the lack of energy equipartition in granular mixtures. Some of the topics covered in this monograph include: Navier-Stokes transport coefficients for granular gases at moderate densities Long-wavelength instability in freely cooling flows Non-Newtonian transport properties in granular shear flows Energy nonequipartition in freely cooling granular mixtures Diffusion in strongly sheared granular mixtures Exact solutions to the Boltzmann equation for inelastic Maxwell models.

Particle Size Segregation And Rheology Of Geophysical Granular Flows

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Author : James Baker
language : en
Publisher:
Release Date : 2017

Particle Size Segregation And Rheology Of Geophysical Granular Flows written by James Baker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.

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.