Title: 3D DEM simulations
13D 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/
2GRANULAR 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
3DEM 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
4Model 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
5Fluid phase
Continuity Momentum particle-gas interaction
force
6Coupling term
- Anderson Jackson (1967)
- with and
7Model
8constitutive relations
- viscous stressNewtonian fluid (Bird et al. 1960)
- drag force (Di Felice, 1994)
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10Initial state of 2D and 3D group-D particle beds
after pluvial deposition
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12onset of fluidisation - 2D
13onset of fluidisation - 3D
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152D-3D fluidised beds (rt)
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172D-3D fluidised beds (st)
18Granulation
19David Kafui