Numerical investigation of a coarse-grain discrete element method in solid mixing in a spouted bed

Takabatake, Kazuya; Mori, Yuki; Khinast, Johannes G.; Sakai, Mikio

doi:10.1016/j.cej.2018.04.015

Cited by 97 publications

(27 citation statements)

References 33 publications

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“…Larger scale riser flow simulations were carried out for energy applications, such as for a chemical looping system [102] and for a fluidized bed carbonator [103,104], in both cases using a commercial software. A complex combination of tools including coarse grain Solids motion in spouted beds was investigated with focus on the solids and velocity distributions, pressure drop and solids mixing [86]. The effect of gas inlet in prismatic spouted beds was also investigated successfully [100].…”

Section: Circulating Fluidized Beds and Cyclonesmentioning

confidence: 99%

Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

2021

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In the last decade, a few of the early attempts to bring CFD-DEM of fluidized beds beyond the limits of small, lab-scale units to larger scale systems have become popular. The simulation capabilities of the Discrete Element Method in multiphase flow and fluidized beds have largely benefitted by the improvements offered by coarse graining approaches. In fact, the number of real particles that can be simulated increases to the point that pilot-scale and some industrially relevant systems become approachable. Methodologically, coarse graining procedures have been introduced by various groups, resting on different physical backgrounds. The present review collects the most relevant contributions, critically proposing them within a unique, consistent framework for the derivations and nomenclature. Scaling for the contact forces, with the linear and Hertz-based approaches, for the hydrodynamic and cohesive forces is illustrated and discussed. The orders of magnitude computational savings are quantified as a function of the coarse graining degree. An overview of the recent applications in bubbling, spouted beds and circulating fluidized bed reactors is presented. Finally, new scaling, recent extensions and promising future directions are discussed in perspective. In addition to providing a compact compendium of the essential aspects, the review aims at stimulating further efforts in this promising field.

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Section: Circulating Fluidized Beds and Cyclonesmentioning

confidence: 99%

Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

2021

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“…The drag coefficient β is calculated using the diameter of the real physical particles. The derivations and validations of this CG approach are available in literature …”

Section: Numerical Models and Simulation Parametersmentioning

confidence: 99%

“…Xiong et al reviewed the widely used CFD models such as multifluid modeling, in which gas–sands–biomass are all treated as continuum phases; Euler–Lagrange–Lagrange modeling, in which gas phase is treated as continuum phase while sands and biomass are treated as discrete phase; Euler–Euler–Lagrange modeling, in which the gas phase and sands are treated as continuum phase while biomass is treated as discrete phase. The Lagrange‐based methods directly tracked the positions of particles and is convenient for the analysis of mixing . In gas–solid CFD simulation, the drag model which describes the gas–solids interactions plays a key role.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of sands and Geldart A biomass co‐fluidization

Gao

et al. 2020

AIChE Journal

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This article investigated the fluidization of sands and small Geldart A biomass mixtures. The mixture fluidized like Geldart A type particles with a uniform bed expansion regime before bubbling. The video recorded color distance between pure sands and sands-biomass mixtures was used to estimate the sands-biomass mixing. The coarse-grained computational fluid dynamics-discrete element method with a hybrid drag model which couples the Syamlal-O'Brien drag and a filtered drag can capture the mixing while the simulation with Gidaspow drag predicted a segregated bed. The simulations were further validated with experimental measured pressure drops. The time averaged pressure drop equals the weight of the bed material, however, its fluctuation is about three times of the bed material fluctuation. K E Y W O R D S biomass, coarse-grained CFD-DEM, drag model, filtered model, fluidized bed

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“…Assume the liquid and solid phase is a continuous phase and gas are particulate phase, the inter-facial drag coefficients are (from Ergun equation [32,33,34]),…”

Section: Inter-phase Momentum Transfermentioning

confidence: 99%

A three-phase interpenetrating continua approach for wave and porous structure interaction

Yang

Buchan

Pavlidis

et al. 2020

Self Cite

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Purpose This paper aims to propose a three-phase interpenetrating continua model for the numerical simulation of water waves and porous structure interaction. Design/methodology/approach In contrast with one-fluid formulation or multi-component methods, each phase has its own characteristics, density, velocity, etc., and each point is occupied by all phases. First, the porous structure is modelled as a phase of continua with a penalty force adding on the momentum equation, so the conservation of mass is guaranteed without source terms. Second, the adaptive unstructured mesh modelling with P1DG-P1 elements is used here to decrease the total number of degree of freedom maintaining the same order of accuracy. Findings Several benchmark problems are used to validate the model, which includes the Darcy flow, classical collapse of water column and water column with a porous structure. The interpenetrating continua model is a suitable approach for water wave and porous structure interaction problem. Originality/value The interpenetrating continua model is first applied for the water wave and porous structure interaction problem. First, the structure is modelled as phase of non-viscous fluid with penalty force, so the break of the porous structure, porosity changes can be easily embedded for further complex studies. Second, the mass conservation of fluids is automatically satisfied without special treatment. Finally, adaptive anisotropic mesh in space is employed to reduce the computational cost.

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Numerical investigation of a coarse-grain discrete element method in solid mixing in a spouted bed

Cited by 97 publications

References 33 publications

Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

Experimental and numerical investigation of sands and Geldart A biomass co‐fluidization

A three-phase interpenetrating continua approach for wave and porous structure interaction

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