Large-scale discrete element modeling in pneumatic conveying

Sakai, Mikio; Koshizuka, Seiichi

doi:10.1016/j.ces.2008.10.003

Cited by 270 publications

(88 citation statements)

References 18 publications

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“…The occurring transport modes are dependent on the geometry of the pipes, the conveying velocity, the particle diameter and the mass load of the system [3]. Currently, the predominantly used transport mode is the dilute phase regime with solid fractions less than 10 % [4] where the solids are fully suspended in the gas flow. This has the advantage of low pressure fluctuations and high stability, but also suffers from high power consumption and product degradation as a result of the high transport velocities.…”

Section: Introductionmentioning

confidence: 99%

“…This has the advantage of low pressure fluctuations and high stability, but also suffers from high power consumption and product degradation as a result of the high transport velocities. Because of this, the dense phase regime has received increasing attention in recent years [4], where transport velocities are much lower and localized dense plugs develop clearly separated from the fluid flow. However, this causes high pressure fluctuations and the system gets prone to instabilities and blockage of the pipes for some particulates [5].…”

Section: Introductionmentioning

confidence: 99%

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Coupled DEM‐CFD Simulation of Pneumatically Conveyed Granular Media

et al. 2010

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A DEM-CFD coupling for the simulation of gas-solid flows was successfully implemented and simulations were performed for the application to industrial-scale pneumatic conveying. Therefore, all particle collisions and phase interactions were considered and porosity determination was optimized. The aim of this work is to show the applicability of the presented simulation model to the different regimes of pneumatic conveying systems. As a first test case a dense vertical pneumatic conveying system was chosen and an individual plug was investigated in detail. Variations of the conveying air velocity were also considered. As a second test case dilute conveying in a horizontal-to-vertical pipe bend was simulated. The occurrence of roping and the reduction of particle velocity is of high interest for the design of specific pneumatic systems. It is shown that both regimes can be captured reasonably well and the results are rich in details.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coupled DEM‐CFD Simulation of Pneumatically Conveyed Granular Media

et al. 2010

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“…The present study incorporates a particle scaling law in the governing equations of the DEM using the similar particle assembly (SPA) model developed by Kuwagi et al 22 Sakai et al 23,24 used coarse grain model for a large DEM simulation in which particle-particle and particle-fluid interaction forces are based on the SPA approach. Moreover, they described the modeling approach in rotational direction.…”

Section: Introductionmentioning

confidence: 99%

Validation of the similar particle assembly (SPA) model for the fluidization of Geldart's group A and D particles

et al. 2011

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in Wiley Online Library (wileyonlinelibrary.com).The similar particle assembly (SPA) model proposed for large-scale discrete element method simulation was validated. The SPA model describes the scaling law for the motion of particles in an assembly, which is derived from the equation of motion of a particle. In the SPA model, particles with similar physical or chemical properties are represented by a single particle, which is called the representative particle. The local assembly of particles in the original bed is supposed to be maintained in the bed with the representative particles. The SPA model was validated by numerical simulations of a 2D fluidized bed of noncohesive and cohesive particles. Using the SPA model, the flow behavior of the representative particles of a certain magnification can be made similar to that of the original particles with significantly less computational load. A good approximation of bubble size distribution between the SPA bed and the original bed was obtained.

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“…Hence, a new large-scale DEM simulation model, called a coarse grain model [18][19][20], was proposed to resolve the imperfections of the existing models. The coarse grain model has been applied to pneumatic conveying [18], single bubble generation in a fluidized bed [19] and a fundamental study of solid-liquid flow modeling [20] so far.…”

Section: Introductionmentioning

confidence: 99%

Large‐scale discrete element modeling in a fluidized bed

Sakai

Yamada

Shigeto

et al. 2010

Numerical Methods in Fluids

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106

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SUMMARYThe discrete element method (DEM) is widely used in calculating powder systems. The DEM makes it possible to determine the complicated phenomena related to particle flowability. However, DEM has a fatal problem, which is that the number of calculated particles is restricted due to excessive calculation costs. Consequently, we have developed a large-scale model of the DEM, which is called the coarse grain model. The coarse grain particle represents a group of the original particles. Therefore, a large-scale DEM simulation can be performed using an extremely small number of the calculated particles. In our previous studies, the coarse grain model was applied in gas-solid and solid-liquid flow systems. It is anticipated that the coarse grain model will be used in various powder systems. In the current study, the coarse grain model has been applied to a two-dimensional bubbling fluidized bed. The adequacy of the coarse grain model was proved by a comparison with the original particle behavior. The simulation results obtained using the coarse grain model showed good agreement with the results for the original system. Moreover, the calculation speed with the coarse grain model was shown to be much faster than the calculation speed of the original model.

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Large-scale discrete element modeling in pneumatic conveying

Cited by 270 publications

References 18 publications

Coupled DEM‐CFD Simulation of Pneumatically Conveyed Granular Media

Coupled DEM‐CFD Simulation of Pneumatically Conveyed Granular Media

Validation of the similar particle assembly (SPA) model for the fluidization of Geldart's group A and D particles

Large‐scale discrete element modeling in a fluidized bed

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