An effective sphere-based model for breakage simulation in DEM

Tavares, Luís Marcelo; Rodriguez, Victor A.; Sousani, Marina; Padros, Carles Bosch; Ooi, Jin Y.

doi:10.1016/j.powtec.2021.07.031

Cited by 49 publications

(16 citation statements)

References 43 publications

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“…The Hertz-Mindlin contact model was used, in which the normal force component is described on the basis of Hertz contact theory, whereas the tangential force model is based on Mindlin-Deresiewicz work (Mindlin 1949;Mindlin and Deresiewicz 1953). Furthermore, these particles are allowed to break owing to the use of a spherebased particle replacement (PRM) strategy, recently proposed by Tavares et al (2021) and coded in an application programming interface (API). Finally, a two-way coupled model based on MBD and DEM was implemented to calculate the dynamics of the floating roll as initially proposed elsewhere (Edwards et al, 2013;Barrios and Tavares, 2016).…”

Section: Coupled Dem-mbd-prm Simulationsmentioning

confidence: 99%

A Hybrid PBM-DEM Model of High-Pressure Grinding Rolls Applied to Iron Ore Pellet Feed Pressing

Rodriguez

Campos

Barrios

et al. 2023

KONA

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Mathematical models of high-pressure grinding rolls (HPGR) have attracted great attention, owing to their role in optimization of operating machines as well as in the design and selection of new ones. Although population balance models (PBM) and the discrete element method (DEM) have been used in this task, both suffer from important limitations. Whereas PBMs have challenges associated to the prediction of operating gap and to the validity of several of its assumptions in different formulations in the literature, application of DEM has its own challenges, in particular when fed with distributions containing large amounts of fines. This work proposes a hybrid approach in which the coupling of DEM to particle replacement models and multibody dynamics is used to predict operating gap, throughput and power, as well as providing information along the rolls length that is used in PBM to predict the product fineness. The hybrid approach is then compared to both DEM and a PBM (Modified Torres and Casali), demonstrating similar results to the later when applied to simulating a pilot-scale machine operating under different conditions, but improved prediction when applied in scale-up to an industrial-scale HPGR.

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Section: Coupled Dem-mbd-prm Simulationsmentioning

confidence: 99%

A Hybrid PBM-DEM Model of High-Pressure Grinding Rolls Applied to Iron Ore Pellet Feed Pressing

Rodriguez

Campos

Barrios

et al. 2023

KONA

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“…Considering the complex structure characteristics of banana straw, EDEM software was used to establish a banana straw discrete element model with particles having a size of 0.95 mm [12]. The internal porous structure of banana straw was characterised by combining one layer closely arranged particles and four layers of particles with voids.…”

Section: Establishment Of Discrete Element Modelmentioning

confidence: 99%

A Study on the Physical Properties of Banana Straw Based on the Discrete Element Method

Zhang¹,

Jiang²,

Wang³

2023

Fluid Dynamics &Amp; Materials Processing

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To improve the application of discrete element models (DEM) to the design of agricultural crushers, in this study a new highly accurate model is elaborated. The model takes into account the fiber structure, porous nature of the material and the leaf sheath coating structure. Dedicated experimental tests are conducted to determine the required "intrinsic" and basic contact parameters of the considered banana straw materials. A large number of bonding parameters are examined in relation to the particle aggregation model in order to characterize different actual banana straws. Using the particle surface energy contact model, the viscosity characteristics of the crushed material are determined together with the related stacking angle (considered as the main response factor). Through single factor experiment analysis, it is found that when the surface energy is 0.9 J•m -2 , the relative error between simulations and physical experiments is 5.288%.

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“…Nowadays, many techniques and methods supporting the design, efficient operation, and performance assessment of mechanical processing are used in investigations. Among the most significant characteristics determining the effectiveness of comminution operations are particle breakage intensity and size reduction ratio, the size distribution of products, productivity, energy consumption, wear of liners, and movable parts of machines and others [24,25]. These can be distinguished following major directions in the modeling of mineral processing:…”

Section: Simulation In Mineral Processingmentioning

confidence: 99%

Challenges in Raw Material Treatment at the Mechanical Processing Stage

Saramak

2021

Minerals

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This paper concerns problems related to the mechanical processing of mineral raw materials. The aspects explored were limited to the analysis of comminution technologies in terms of their effectiveness and energy consumption, modeling and simulation approaches, the assessment of crushing results, and environmental aspects. This article includes investigation of new technologies of comminution, comparing HPGR, high-voltage pulses, and electromagnetic mills. In the area of modeling and optimization, special attention was paid to the approximation of the particle size distribution of crushing products by means of Weibull, log-normal, and logistic functions. Crushing products with an increased content of fines were well characterized by Weibull’s distribution, while log-normal function adequately described HPGR products with a relatively low content of fines.

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An effective sphere-based model for breakage simulation in DEM

Cited by 49 publications

References 43 publications

A Hybrid PBM-DEM Model of High-Pressure Grinding Rolls Applied to Iron Ore Pellet Feed Pressing

A Hybrid PBM-DEM Model of High-Pressure Grinding Rolls Applied to Iron Ore Pellet Feed Pressing

A Study on the Physical Properties of Banana Straw Based on the Discrete Element Method

Challenges in Raw Material Treatment at the Mechanical Processing Stage

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