2 edition of Studies of granular flow and segregation in hoppers using positron emission particle tracking found in the catalog.
Studies of granular flow and segregation in hoppers using positron emission particle tracking
Thesis (PhD) - University of Birmingham, School of Chemical Engineering.
|Statement||by John Shepperson.|
|The Physical Object|
|Pagination||447 p. :|
|Number of Pages||447|
The poem Auguries of Innocence by William Blake illustrates one of the complexities of granular physics: Each grain of sand is unique 1 1. G. Greenberg, A Grain of Sand: Nature’s Secret Wonder (Voyageur Press, St. Paul, MN, ). and the entirety of particle-particle interactions in a sand pile is unpredictable. 2 2. J. Duran, Sands, Powders and Grains . C-Y Wu, X F Fan, F Motazedian, J P K Seville, D J Parker, A C F Cocks, Quantitative investigation of powder flow during die filling using positron emission particle tracking, Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, /JPME, , 3, (), ().
Granular flow from hopper (study of flow profile) using DEM technique - Duration: Raj Kishor views. PFC2D Specimen Damage Plots - Duration: C-Y Wu, X F Fan, F Motazedian, J P K Seville, D J Parker and A C F Cocks, Quantitative investigation of powder flow during die filling using positron emission particle tracking, Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, /JPME, , 3, (), ().
The hopper geometry is chosen according to Yang and Hsiau (, “The Simulation and Experimental Study of Granular Materials Discharged From a Silo With the Placement of Inserts,” Powder Technol., (3), pp. –), who performed both experimental and numerical investigations. The considered setup is attractive because it involves. Segregation and poor flow are potential concerns in the operation of industrial hoppers. Flow problems include arching and bridging, which can stop flow from the hopper, and ratholing—the stagnation of material at the hopper walls which effectively reduces capacity. These issues can be addressed via changes in hopper design or modification of.
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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.
An experimental study has been carried out on the solids motion in a conical frustum-shaped vertical high shear mixer granulator by using the positron emission particle tracking.
The in-situ tracking of granular particles during discharge should provide further information regarding silo flow. Methods such as Positron Emission Particle Tracking (PEPT) [5,6], and Electrical Capacitance Tomography (ECT) [, ] can be used to visualize the internal flow pattern of a silo.
However, each method has its own by: 1. This paper is therefore to study the dynamics of granular motion in such a kind of system using Positron Emission Particle Tracking (PEPT), which allows the motion of a single tracer particle. Positron emission tomography (PET) and positron emission particle tracking (PEPT) are unique in flow visualization terms, being capable of probing such opaque systems and examining flow phenomena.
For industrial imaging more often a modified version of conventional PET, known as positron emission particle tracking (PEPT) is used to study particle dynamics, granular systems and multiphase flows (Parker, Broadbent, Fowles, Hawkesworth, & McNeil, ).
In PEPT a single radioactive particle is tracked as it moves through the system under. However, the process is difficult to monitor and control and the structure of the granular flow is poorly understood.
Positron emission particle tracking was used to study powder flow. Granular flow on vibrating screens exhibits complex phenomena such as segregation, percolation and flow of oversize material over the separating medium.
In this work, a unique granular rheology is established for particles moving on a vibrating screen. Granular flow modelling of rotating drum flows using positron emission particle tracking. Such mixers have been studied using positron emission particle tracking (PEPT) by Broadbent et al.
and more recently by Jones and Bridgwater. This technique permits visualisation of the granular flow in the mixer and allows quantitative characterisation of the mixing by following the long term trajectories of an irradiated tracer particle.
To this end, several large-scale DEM-based numerical investigations of the flow of monodisperse and bidisperse blends of up to particles over a span of s in a V-blender will be discussed using entities such as the particle velocity and granular temperature, the torque of the mixing system, RSD curves and mixing times.
Marston, J. & Thoroddsen, S. Investigation of granular impact using positron emission particle tracking. Powder Technology. Particle motion within a cylindrical vessel of a Turbula mixer has been measured for 2mm glass spheres using Positron Emission Particle Tracking (PEPT).
Granular flow from hopper (study of flow profile) using DEM technique Particle animation with Paraview - Duration: Granular flow in a rotating drum. Nan Gui, Shengyao Jiang, Jiyuan Tu, Xingtuan Yang, Application in granular flows, Gas-Particle and Granular Flow Systems, /B, (), ().
Crossref Bei-Bing Dai, Jun Yang, Feng-Tao Liu, Xiao-Qiang Gu, Kai-Rong Lin, A new index to characterize the segregation of binary mixture, Powder Technology, /j. The presence of liquids can significantly affect the dynamics of granular flow.
This paper investigates the effect of liquids on radial segregation of granular mixture in a rotating drum using the discrete element method. The wet granular mixture, due to differences in particle size and density, segregates in a similar way to that of dry particles: lighter/larger particles move to.
Results of discrete element method (DEM) simulation and magnetic resonance imaging (MRI) experiments are compared for monodisperse granular materials flowing in a half-filled horizontal rotating cylinder.
Because opacity is not a problem for MRI, a long cylinder with an aspect ratio ∼7 was used and the flow in a thin transverse slice near the center was studied. The segregation of granular materials due to differences in particle properties occurs during a variety of handling and transport processes, such as flow from a hopper.
In the present work, the discrete element method (DEM) is used to investigate segregation of granular materials during discharge from a hopper. The effects of various particle properties and [ ]. Investigation of the effect of particle size and shape on segregation in hoppers using Positron Emission Particle Tracking.
rson, J.P.K. Seville R.W. Greenwood and Seventh Bulk Materials Storage, Handling and Transportation Conference, OctoberNewcastle, New South Wales, Australia. Vol 1 page A binary three-dimensional highly fluidized vibrated granular bed has been investigated for the first time using positron emission particle tracking.
Packing fraction distributions and granular temperature profiles are calculated for each species and the response to changes in the amplitude of vibration and the number of grains are determined.
This paper presents a comparison numerical study of the dry and wet granular flows in a cylindrical hopper with flat bottom by means of the discrete element method. A cohesion model is used to examine the impact of moisture presence in hopper flow.
It is found that with the increase of Bond number, the discharge rate decreases. The particle force structure inside the hopper. The discharge of granular material from a hopper subject to vertical sinusoidal oscillations was investigated using experiments and discrete element computer simulations.
With the hopper exit closed, side-wall convection cells are observed, oriented such that particles move up along the inclined walls of the hopper and down at the center line.
The convection cells are a result of the granular.Abstract. The aim of this study is to present a novel approach for analyzing the pharmaceutical solid mixing performance of monodisperse particles by a numerical simulation using the mathematical model of rigid solid objects “for a large span of time reached 20 min”.zone inside 60º internal angle hopper using amaranth seeds as granular material.
Application of PIV to evaluate velocity profiles of granular flow using 2-D transparent silos and hoppers have been also used in the past [25, 26, ].
In these studies, the granular materials varied from agricultural seeds [25, 33] to glass beads .