On the computational aspects of comminution in discrete element method

Chaudry, Mohsin Ali; Wriggers, Peter

doi:10.1007/s40571-017-0161-8

Cited by 19 publications

(9 citation statements)

References 23 publications

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“…The discrete element method (DEM) is proven as a powerful numerical method for modeling the granular material flow regimes [21][22][23][24], bulk material characterization [25,26], breakage models [27][28][29][30][31], etc. In DEM, individual interactions of the particles are monitored contact by contact and the particle motion is modeled particle by particle [32].…”

Section: Methodsmentioning

confidence: 99%

Breakage behavior of biomass pellets: an experimental and numerical study

2020

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The presence and generation of fines and dust in the bulk of biomass pellets have inflicted several problems in the supply chain during transportation and storage, and the breakage behavior of pellets has been scarcely studied so far. Fines and dust are the consequences of impact and abrasive forces through the whole supply chain; however, the breakage happens at the particle level. Therefore, to study the fines generation, first, the breakage behavior of individual pellets should be understood, and then, the behavior of the bulk materials in operational conditions can be investigated. This paper aims to investigate the breakage behavior of individual pellets under experimental compression tests and to introduce a calibrated numerical model using discrete element method (DEM) in order to pave the way for further studies on pellet breakage. For that purpose, seven different types of biomass pellets were studied experimentally, and then, a calibrated model was introduced via the Timoshenko-Ehrenfest beam theory using DEM. Results show that the model could reasonably predict the breakage behavior of pellets under uniaxial and diametrical compressions. The findings could help to develop a new design of the equipment for transportation and handling of biomass pellets with the aim to reduce the amount of generating fines and dust.

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Section: Methodsmentioning

confidence: 99%

Breakage behavior of biomass pellets: an experimental and numerical study

2020

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“…Using a continuous approach for numerical modelling, the FEM will be introduced in more detail, followed by a very brief overview of the DEM. Further details on the coupling with DEM can be found in [110,111,112].…”

Section: Numerical Implementationmentioning

confidence: 99%

Experimental testing and numerical simulation of granules as crash absorber for double hull structures

Woitzik¹

2021

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In the maritime sector, the collision safety is an essential aspect of ship operation. Aiming at further improvements,thefillingofthecavityinadoublehullstructurewithgranularmaterialisinvestigatedinthis thesis. Inordertodoso,thepotentialofdifferentgranulesisdeterminedexperimentally,alongwiththedescription of their material parameters as particles and as a bulk material, respectively. Furthermore, a simplifiedsidehullstructureisdesignedforexperimentaltesting,followedbyanumericalstudyofdifferentmaterial models for the granules. This leads to the simulation of a realistic collision scenario, showing the potential in the maritime industry. Contents 1 Introduction 1 1.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 State of the art . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Purpose and scope of this thesis . . . . . . . . . . . . . . . . . . . . . . . . 4 1.4 Outline of this thesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Constitutive equations and numerical implementation 6 2.1 Constitutive equations . . . . . . . ....

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“…In [24], a DEM model is used to study a batch vertical stirred mill. In [25], the computational aspects of DEM modeling of crushing and comminution of granular materials are addressed.…”

Section: Introductionmentioning

confidence: 99%

A Novel Particle-Based Approach for Modeling a Wet Vertical Stirred Media Mill

et al. 2021

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Modeling of wet stirred media mill processes is challenging since it requires the simultaneous modeling of the complex multiphysics in the interactions between grinding media, the moving internal agitator elements, and the grinding fluid. In the present study, a multiphysics model of an HIG5 pilot vertical stirred media mill with a nominal power of 7.5 kW is developed. The model is based on a particle-based coupled solver approach, where the grinding fluid is modeled with the particle finite element method (PFEM), the grinding media are modeled with the discrete element method (DEM), and the mill structure is modeled with the finite element method (FEM). The interactions between the different constituents are treated by loose (or weak) two-way couplings between the PFEM, DEM, and FEM models. Both water and a mineral slurry are used as grinding fluids, and they are modeled as Newtonian and non-Newtonian fluids, respectively. In the present work, a novel approach for transferring forces between grinding fluid and grinding media based on the Reynolds number is implemented. This force transfer is realized by specifying the drag coefficient as a function of the Reynolds number. The stirred media mill model is used to predict the mill power consumption, dynamics of both grinding fluid and grinding media, interparticle contacts of the grinding media, and the wear development on the mill structure. The numerical results obtained within the present study show good agreement with experimental measurements.

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On the computational aspects of comminution in discrete element method

Cited by 19 publications

References 23 publications

Breakage behavior of biomass pellets: an experimental and numerical study

Breakage behavior of biomass pellets: an experimental and numerical study

Experimental testing and numerical simulation of granules as crash absorber for double hull structures

A Novel Particle-Based Approach for Modeling a Wet Vertical Stirred Media Mill

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