Flow patterns in granulating systems

Forrest, Sarah; Bridgwater, J.; Mort, Paul R.; Litster, James D.; Parker, D.J.

doi:10.1016/s0032-5910(02)00232-2

Cited by 33 publications

(29 citation statements)

References 13 publications

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“…However, only a few of them used discrete element method (DEM) to analyze the flow pattern of the solid particles in the plowshare mixers. Some researchers used PEPT (positron emission particle tracking) to determine the flow pattern and average velocity of the particles experimentally [9][10][11]. Laurent and Bridgwater [12] studied the performance of the plowshare mixer by PEPT and showed that the axial dispersion coefficient changed linearly with the rotational speed of the blade at lower than 50 rpm.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the mixing of solid particles in a plowshare mixer via discrete element method (DEM)

2015

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Section: Introductionmentioning

confidence: 99%

Analysis of the mixing of solid particles in a plowshare mixer via discrete element method (DEM)

2015

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“…In particular, partially wetted granular materials have remained largely unexplored due to the intricate texturing of water in the pore space (Scheel et al 2008) in spite of its crucial cohesive effect in many natural and industrial processes such as slope stability by vegetation due to the hydro-mechanical properties of the root-soil matrix (Ghestem, Sidle & Stokes 2011), pollution transport above the phreatic zone where water is retained by capillary forces, wet mixing and agglomeration of ores and powders (Bocquet et al 1998;Forrest et al 2002;Litster & Ennis 2004;Ruiz et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Liquid clustering and capillary pressure in granular media

2014

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By means of extensive lattice Boltzmann simulations, we investigate the process of growth and coalescence of liquid clusters in a granular material as the amount of liquid increases. A homogeneous grain-liquid mixture is obtained by means of capillary condensation, thus providing meaningful statistics on the liquid distribution inside the granular material. The tensile stress carried by the grains as a function of the amount of condensed liquid reveals four distinct states, with a peak stress occurring at the transition from a primary coalescence process, where the cohesive strength is carried mostly by the grains, to a secondary process governed by the increase of the liquid cluster volumes. We show that the evolution of capillary states is correctly captured by a simple model accounting for the competing effects of the Laplace pressure and grain-liquid interface.

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“…A few researchers such as Lanre et al [15], Bennington [16] and Bhole [17] used the granular multiphase scheme of the CFD codes exclusively in the stirred tank application to predict the pulp suspension behaviour. Forest et al [18] investigated the wet granulation and granule growth that may occur when granules collide and stick together to form larger granules. In this study, we are not going to deal with granule growth.…”

Section: Introductionmentioning

confidence: 99%

CFD Modelling of Solid–Liquid Multiphase and Mathematical Separation of the Phases in a Continuous Pulp Digester

Pourian

Dahlquist

2010

International Journal of Modelling and Simulation

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This paper describes the use of a CFD multiphase model using finite volume method, FLUENT, to aid understanding of the physical behaviour of solid and liquid flows in the digester of the pulping process. We take into consideration the mass balance of the multiinlets, outlets and circulation flows in the digester. We also look at the application of a porous media model to describe the dynamic behaviour of the liquor flow through a bed of solid particles. The cylindrical Korsnas/Vallvik pulping digester in Sweden is represented in the models as an axisymmetric two-dimensional model, which includes multiple feeds, outlets, pressure adjustment outflows and circulation pipes. Separation of the phases is an important part of the pulping process. A number of multiphase models are evaluated for their potential use in phase separation. For this evaluation we constructed the two-dimensional digester model in the Gambit software package, a preprocessor tool for FLUENT. Physical strainers at the entrances of outlet pipes were designed in Gambit, in order to investigate the possibility of physically separating large solid particles from the liquid flow where both phases are subject to suction into the circulation pipes. The compaction of the wood chips is also considered in the modelling. In the porous model, the digester is divided into sections of different porosity, and the behaviour of individual suspension particles is not considered. The bulk of this paper concerns modelling mass balances and phases of the mixture in the digester using Eulerian and mixture strategies.

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Flow patterns in granulating systems

Cited by 33 publications

References 13 publications

Analysis of the mixing of solid particles in a plowshare mixer via discrete element method (DEM)

Analysis of the mixing of solid particles in a plowshare mixer via discrete element method (DEM)

Liquid clustering and capillary pressure in granular media

CFD Modelling of Solid–Liquid Multiphase and Mathematical Separation of the Phases in a Continuous Pulp Digester

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