Simulation of solids flow and energy transfer in a vertical shaft impact crusher using DEM

Cunha, Emerson Reikdal da; Carvalho, Rodrigo M. de; Tavares, Luís Marcelo

doi:10.1016/j.mineng.2012.09.003

Cited by 38 publications

(12 citation statements)

References 11 publications

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“…Data initially used to simulate the behaviour of particles in the Eirich mixer were derived from a rock that is used for production of aggregates, which was also used in simulations of a vertical shaft impact crusher [ 22 ]. These included the static and rolling friction coefficients, the coefficient of restitution, the physical properties, etc.…”

Section: Methodsmentioning

confidence: 99%

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Simulation of the Attrition of Recycled Concrete Aggregates during Concrete Mixing

et al. 2021

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Concrete mixing can lead to mechanical degradation of aggregates, particularly when dealing with recycled concrete aggregates. In this work, the attrition of such materials during mixing is studied by means of experiments and simulations. The effect of the presence of fines, water addition, flow configuration of the mixer (co- or counter-current) and impeller frequency is discussed. Experiments were performed in a laboratory Eirich mixer. Discrete element numerical simulations (DEM) were performed on the same geometry by mimicking the behaviour of the material and, in particular, the cohesion induced by water and the cement paste using either Hertz–Mindlin or Hertz–Mindlin with Johnson–Kendall–Roberts (JKR) contact laws. The combination of the collision energy spectra extracted from the DEM simulations and an attrition model allowed the prediction of the mass loss due to attrition in 1-min experiments. Semi-quantitative agreement was observed between experiments and simulations, with a mean relative error of 26.4%. These showed that higher mass losses resulted from operation at the highest impeller speeds, co-current operation, and also with the wet aggregate. Mixing of the agglomerate in the concrete mix resulted in a significant reduction in attrition when compared to mixing aggregates alone. With further validation, the proposed simulation approach can become a valuable tool in the optimization of mixing by allowing the effects of material, machine and process variables to be studied on the mass loss due to attrition.

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Section: Methodsmentioning

confidence: 99%

“…As mentioned, some of the data from previous studies [ 22 ] only served as initial estimates for the calibration of contact parameters. Bench-scale tests were performed to determine the aggregate angle of repose and the value of the angle used as a reference for the simulations.…”

Section: Methodsmentioning

confidence: 99%

Simulation of the Attrition of Recycled Concrete Aggregates during Concrete Mixing

et al. 2021

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“…Energi yang hilang dalam tumbukan merupakan informasi yang dapat digunakan dalam pemodelan pemecahan partikel. Dalam kasus tumbukan elastis, teori kontak pada DEM menunjukkan bahwa perpecahan energi yang terkait dengan deformasi lokal bergantung kepada sifat elastis atau kekakuan dari benda yang bersentuhan [6].…”

Section: B Discrete Element Methods (Dem)unclassified

Perancangan Hammer Pada Mesin Hammer Mill Menggunakan Metoda Discrete Element Modelling Untuk Meningkatkan Kehalusan Penggilingan Kulit Kopi

Kurniawan

Kusnayat

Syafrizal

2017

JRSI

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Hammer mill merupakan alat pengecilan ukuran bahan karena adanya tumbukan yang terus menerus antara bahan yang dimasukkan dengan hammer yang berputar pada kecepatan tinggi. Kinerja penggilingan hammer mill diteliti menggunakan discrete element modelling (DEM) melalui rancangan eksperimen simulasi sehingga lingkungan simulasi virtual untuk mendapatkan pemahaman mendasar mengenai pengaruh desain hammer terhadap perubahan hasil penggilingan. Model simulasi disusun berdasarkan sistematika design of experiment untuk mengetahui rancangan hammer yang memberikan nilai respon terbesar berdasarkan faktor yang paling signifikan. Simulasi yang dilakukan menghasilkan nilai energi yang hilang pada partikel kulit kopi saat terjadinya tabrakan dengan hammer yang menggambarkan terjadinya perpecahan partikel di dalam penggilingan. Tujuan dari studi ini adalah untuk menentukan rancangan hammer yang baru atau perbaikan rancangan hammer sebelumnya agar dapat meningkatkan kehalusan penggilingan kulit kopi. Rancangan simulasi yang dijalankan menyimpulkan desain hammer dengan menambahkan ketebalan serta menambah mata pisau menghasilkan rata-rata nilai respon terbesar yaitu 826,88 J. Faktor menambah menambahkan ketebalan menjadi faktor yang paling signifikan terhadap perpecahan partikel kulit kopi dengan nilai pengaruh sebesar 356,41J.

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“…Recently, it was proven that this approach is a powerful tool in understanding the projectile penetration and the soil or concrete target fracture [9][10][11]. More importantly, it can preferably reflect the characteristics of interface friction [12], wear [13], energy transmission, and the movement of broken materials [14]. These advantages will be beneficial to understand the effect of nonsmooth surface on the projectile nose contact with the crashed particle of the geological target.…”

Section: Instructionmentioning

confidence: 99%

Effect of Nonsmooth Nose Surface of the Projectile on Penetration Using DEM Simulation

Han

Liu

Wang

et al. 2017

Shock and Vibration

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The nonsmooth body surface of the reptile in nature plays an important role in reduction of resistance and friction when it lives in a soil environment. To consider whether it was feasible for improving the performance of penetrating projectile we investigated the influence of the convex as one of nonsmooth surfaces for the nose of projectile. A numerical simulation study of the projectile against the concrete target was developed based on the discrete element method (DEM). The results show that the convex nose surface of the projectile is beneficial for reducing the penetration resistance greatly, which is also validated by the experiments. Compared to the traditional smooth nose structure, the main reason of difference is due to the local contact normal pressure, which increases dramatically due to the abrupt change of curvature caused by the convex at the same condition. Accordingly, the broken particles of the concrete target obtain more kinetic energy and their average radial flow velocities will drastically increase simultaneously, which is in favor of decreasing the interface friction and the compaction density of concrete target around the nose of projectile. InstructionThe penetrating problem of the projectile against geological target has already been the focus of research for a long time. It has been found that there are many factors that influence the penetration performance. The nose of the projectile, named shape function in cavity-expansion theory, could determine the impact pressure [1] and the interface friction [2] between projectile and target. Therefore, as one of the most important factors, it can affect the penetrating resistance directly.In the process of natural evolution, the reptile, such as lizard, dung beetle, and pangolin, has its special body surface morphology, which is classified into five types: groove, rib, scale, convex, and concave according to different shapes. The bionic research has discovered that these specific structures can play important roles in reducing soil resistance and friction when the reptile lives in the geological environment [3]. At present, the explanation for this above phenomenon is attributed to the following aspects [4-6].(i) When the reptile moves in the soil, the nonsmooth surface can decrease the real contact area, resulting in the reduction of friction accordingly. (ii) The nonsmooth surface of the reptile is able to change the movement pattern of the contact soil particle from sliding to rolling. Therefore, it decreases the friction force and has ability of antiwear correspondingly. (iii) The soil compacted density around the reptile could decrease because the groove and concave nonsmooth surface can hold a certain amount of the soil fragments.Inspired by the nonsmooth surface structure, the question is can it be applied to design the projectile nose to deduce the penetration resistance and abrasion? We think it is essential to research the difference of penetration caused by the convex surface.Since the discrete element method (DEM) was developed ...

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Simulation of solids flow and energy transfer in a vertical shaft impact crusher using DEM

Cited by 38 publications

References 11 publications

Simulation of the Attrition of Recycled Concrete Aggregates during Concrete Mixing

Simulation of the Attrition of Recycled Concrete Aggregates during Concrete Mixing

Perancangan Hammer Pada Mesin Hammer Mill Menggunakan Metoda Discrete Element Modelling Untuk Meningkatkan Kehalusan Penggilingan Kulit Kopi

Effect of Nonsmooth Nose Surface of the Projectile on Penetration Using DEM Simulation

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