3D DEM simulations

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3D DEM simulations of gas-solid fluidised beds
Colin Thornton David Kafui
School of Engineering University of
Birmingham,UK c.thornton_at_bham.ac.uk http//civs
g1.aston.ac.uk/gdrg/
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GRANULAR DYNAMICS RESEARCH GROUP(moved from
Aston to Birmingham in October 2002)

• Capabilities
• 3D polydisperse systems
• autoadhesive, elastoplastic frictional spheres
• viscous pendular liquid bridges
• ellipsoidal elastic particles
• 3D Navier-Stokes solver for interstitial fluid
• Applications
• quasi-static deformation of granular media
• agglomerate impact coalescence, fracture and
  attrition
• hopper flow
• rotating drums
• fluidised beds

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DEM simulations of fluidised beds

• In the process engineering industries fluidised
  beds are widely used for a variety of functions.
• Experimentalists obtain very little information
  about the detailed particle/gas behaviour within
  the fluidised bed and this therefore provides an
  ideal opportunity for DEM.
• 2D simulations
• Tsuji Y, Kawaguchi T T Tanaka (1993)
• Powder Technology 77, 79-87.
• pseudo 3D simulations (3D particles,2D fluid)
• Kawaguchi T, Tanaka T Tsuji Y (1998)
• Powder Technology 96, 129-13

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Model formulationKafui, Thornton Adams
(2002)Chem. Eng. Sci. 57, 2395-2410

• Particle interactions
• Theoretical contact mechanics laws ?
• in this case elastoplastic spheres Thornton
  Ning (1998) Powder Tech. 99,154-162
• Particle Motion

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Fluid phase
Continuity Momentum particle-gas interaction
force
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Coupling term

• Anderson Jackson (1967)
• with and

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Model

• Fluid
• Particle

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constitutive relations

• viscous stressNewtonian fluid (Bird et al. 1960)
• drag force (Di Felice, 1994)

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Initial state of 2D and 3D group-D particle beds
after pluvial deposition
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onset of fluidisation - 2D
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onset of fluidisation - 3D
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2D-3D fluidised beds (rt)
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2D-3D fluidised beds (st)
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Granulation
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David Kafui

• thanks