Polydisperse granular flows in a bladed mixer: Experiments and simulations of cohesionless spheres

Remy, Brenda; Khinast, Johannes G.; Glasser, Benjamin J.

doi:10.1016/j.ces.2010.12.022

Cited by 106 publications

(55 citation statements)

References 45 publications

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“…Based on experiments and CFD simulations, Khalilitehrani et al (2013;2015) studied the rheology of dense granular flows in a disc impeller high shear granulator. Remy et al (2009Remy et al ( , 2011 carried out stress analyses of particle flow in a rotating blade mixer using DEM. They found that the normal and shear stresses were affected by the degree of polydispersity of particle size, and the shear stress was sensitive to the particle friction coefficient.…”

Section: Introductionmentioning

confidence: 99%

Analysis of powder rheometry of FT4: Effect of air flow

Nan

Ghadiri

Wang

2017

Chemical Engineering Science

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Understanding of particle flow behaviour as a function of strain rate is of great interest in many items of equipment of industrial processes, such as screw conveyors, impeller mixers, and feeders, etc. The traditional commercial instruments for bulk powder flow characterisation, such as shear cells, operate at low shear strain rates, and are not representative of unit operations under dynamic conditions. In recent years, the FT4 powder rheometer of Freeman Technology has emerged as a widely used technique for characterising particle flow under dynamic conditions of shear strain rate; yet little is known about its underlying powder mechanics. We analyse the effect of gas flow on the flow behaviour of cohesionless particles in FT4 both experimentally and by numerical simulations using the combined discrete element method (DEM) and computational fluid dynamics (CFD). The results show that the effect of gas flow on the flow energy could be described by the resultant fluid-induced drag on the particles above the blade position as the impeller penetrates the bed. The strain rate in front of the blade is mainly determined by the impeller tip speed, and is not sensitive to the gas flow and particle size. The flow energy correlates well with the shear stress in front of the blade. They both increase with the strain rate and are significantly reduced by the upward gas flow.

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Section: Introductionmentioning

confidence: 99%

Analysis of powder rheometry of FT4: Effect of air flow

Nan

Ghadiri

Wang

2017

Chemical Engineering Science

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“…(Note that in Ref. [41] also binary and ternary mixtures were studied using both experiments and simulations -we discuss them later in Chapter 3.) Microstructural characterization of polydisperse particulate media is critical to understand and predict macroscopic properties of soft and granulate systems [4].…”

Section: Why Polydisperse?mentioning

confidence: 99%

“…In granular materials, the degree of polydispersity strongly influences their mechanical response to external loads during shear [37] or compaction [38][39][40], as well as segregation and flow behaviour during mixing [41,42] and discharge processes [43]. (Note that in Ref.…”

Section: Why Polydisperse?mentioning

confidence: 99%

Microstructure and macroscopic properties of polydisperse systems of hard spheres

Ogarko¹

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“…DEM has being used extensively to study particle flow in vertical shaft mixers and granulators. The majority of this work has focussed on simple paddle mixers with flat or inclined blades Kuo et al, 2004;Sato et al, 2008;Remy et al, 2010, Remy et al, 2011Hua et al, 2013). However, more complex geometries such as the three bladed VG-01 (Terashita et al, 2002) have also being studied.…”

Section: Introductionmentioning

confidence: 99%

Development of a discrete element model with moving realistic geometry to simulate particle motion in a Mi-Pro granulator

Watson

Povey

Reynolds

et al. 2016

Computers & Chemical Engineering

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This paper presents the implementation of a methodology incorporating a 3D CAD geometry into a 3D Discrete Element Method (DEM) code; discussing some of the issues which were experienced. The 3D CAD model was discretised into a finite element mesh and the finite wall method was employed for contact detection between the elements and the spherical particles. The geometry was based on a lab scale Mi-Pro granulator. Simulations were performed to represent dry particle motion in this piece of equipment. The model was validated by high speed photography of the particle motion at the surface of the Mi-Pro's clear bowl walls. The results indicated that the particle motion was dominated by the high speed impeller and that a roping regime exists. The results from this work give a greater insight into the particle motion and can be used to understand the complex interactions which occur within this equipment.

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Polydisperse granular flows in a bladed mixer: Experiments and simulations of cohesionless spheres

Cited by 106 publications

References 45 publications

Analysis of powder rheometry of FT4: Effect of air flow

Analysis of powder rheometry of FT4: Effect of air flow

Microstructure and macroscopic properties of polydisperse systems of hard spheres

Development of a discrete element model with moving realistic geometry to simulate particle motion in a Mi-Pro granulator

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