Discrete element simulation of particle motion in ball mills based on similarity

Jiang, Shengqiang; Ye, Yixuan; Tan, Yuanqiang; Liu, Sisi; Liu, Jingang; Zhang, Hao; Yang, Dongmin

doi:10.1016/j.powtec.2018.05.012

Cited by 35 publications

(8 citation statements)

References 38 publications

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“…In DEM, particles can be discrete free bodies [22], or bonded together at contact to form an assembly with arbitrary shapes, which can simulate bulk materials. The latter is called the BPM (bonded particle model) [23].…”

Section: Discrete Element Methodsmentioning

confidence: 99%

Influence of random pore defects on failure mode and mechanical properties of SiC ceramics under uniaxial compression using discrete element method

Jiang

Yang

et al. 2018

Ceramics International

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To investigate the relationship between micro defects in ceramic materials and macro mechanical properties and behaviours, a computational model of SiC ceramics with randomly oriented elliptical pores was established using the discrete element method (DEM). The effects of pore defect content and its aspect ratio on the failure mode, stress-strain curve and mechanical properties of specimen were investigated under uniaxial compression. The effective Young's modulus which was obtained from DEM simulations was compared with the predictions of Mori-Tanaka scheme (MTS) and Self-Consistent scheme (SCS) at various pore defect densities. The results showed that the compressive strength and crack initiation stress decrease nonlinearly as the pore defect content increases. Furthermore, the smaller the aspect ratio of the elliptical pore defects was, the more obvious the weakening trend was. As the pore defect content increases, the failure mode of the specimen changed from brittle fracture to tensile-shear mixing and then to axial splitting. The stress-strain curves showed a certain "softening" period during the loading process. The effective Young's modulus obtained from the DEM simulations coincides with the approximations of MTS and SCS at low pore densities. However, when the pore defect density became larger, the DEM simulation results were slightly lower than the theoretical results of the Mori-Tanaka scheme, which only considers the weak interaction between defects.

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Section: Discrete Element Methodsmentioning

confidence: 99%

Influence of random pore defects on failure mode and mechanical properties of SiC ceramics under uniaxial compression using discrete element method

Jiang

Yang

et al. 2018

Ceramics International

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“…Contemporary tumbling mills commonly employ protruding elements at the surfaces of operating chambers in order to enhance the circulation and reduce the share of passive part of the fill. Numerical modeling of flow, under the action of lifters, of individual particles of the fill was performed, based on the principle of similarity, in paper [6] by applying the discrete elements method (DEM). Study [7] reported an experimental and numerical comparative analysis of the impact of three different profiles of lifters on power of the mill's drive.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Revealing the effect of decreased energy intensity of grinding in a tumbling mill during self-excitation of auto-oscillations of the intrachamber fill

Deineka

Naumenko

2019

EEJET

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Розглянуто можливість здійснення порівняльного оцінювання ефективності процесу подрібнення в барабанному млині при традиційному усталеному та самозбудженому автоколивному режимах руху внутрішньокамерного завантаження. Побудовано математичну модель параметрів ударної дії молольного завантаження на подрібнюваний матеріал. Застосовано аналітико-експериментальний метод візуального аналізу картин течії у поперечному перерізі обертової камери. Чисельно за допомогою наближених процедур встановлено динамічний ефект зростання середніх сум вертикальних складових ударних імпульсів та середніх сум потужностей таких складових при самозбудженні автоколивань. Експериментально встановлено технологічний ефект суттєвого зниження енергоємності та деякого зростання продуктивності виявленого автоколивного процесу подрібнення порівняно із характеристиками традиційного усталеного процесу. Для цього було використано ситовий аналіз продукту подрібнення та вимірювання оборотності руху завантаження і потужності приводу обертання барабана. Як приклад, було розглянуто процес подрібнення цементного клінкера при ступені заповнення камери завантаженням 0,45, відносному розмірі кульових молольних елементів 0,026 та повному заповненні подрібнюваним матеріалом проміжків між молольними тілами. Встановлено, що при самозбудженні автоколивань енергоємність подрібнення знижується на 27,2 %, а продуктивність зростає на 6,7 %. Встановлені в роботі ефекти дозволяють прогнозувати раціональні параметри автоколивного процесу подрібнення в барабанному млиніКлючові слова: барабанний млин, внутрішньокамерне завантаження, ударна дія, самозбудження автоколивань, енергоємність подрібнення UDC 621.926.5:539.215:531.36

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“…In the past decades, modeling and numerical simulation have been used to provide a detailed insight and quantitative guidelines for reactor design and optimization. However, existing work for rotary kilns focuses on the flow field [7][8][9], mixing/segregation [10][11][12][13], and heat transfer performance [6,14,15]; simulation of chemical processes in a rotary kiln is still in its infancy due to the complexity of coupling of dense gas-solid flow, heat transfer, and reactions [16]. There are only few modeling researches concerning the reacting flow for rotary kilns, which can be categorized two types.…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Modeling of Oxidation Process of Coal Tar Pitch in Rotating Kilns

Xie

Wang

Shao

et al. 2019

Mathematical Problems in Engineering

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In this paper, a three-dimensional numerical model has been developed to study the process of oxidative weight increment of coal tar pitch in a rotating kiln. Based on the two-fluid method, the gas phase is modeled by realizable k-turbulent model and the solid phase is modeled by kinetic theory of granular flow. The dense gas-solid flow, heat transfer, and oxidation reaction for the bed and freeboard regions are simultaneously solved. The model is applied to a rotating kiln with a cylinder of 0.75 m length and 0.4 m diameter in the front and circular truncated cone on exit side. The detailed verification of model is firstly performed by comparisons with the available experimental data. The particle velocity profiles, product gas compositions, and various forms of solid motion in rotary kilns are contrastively analyzed. Afterwards, simulations are carried out to obtain the primary hydrodynamic and reactive characteristics in the rotary kiln. At the steady state, the particle velocity peak is located at the active layer surface, while the velocity has the opposite direction in the passive layer. The bed region generally has a higher temperature than the freeboard due to the large thermal capacity. The concentrations of product gas compositions, such as CO 2 , CO, and CH 4 , and solid product of oxidation, increase sharply near the surface and then keep on the steady values inside the bed. The effects of rotational speed of the rotary kiln and flow rate of air are also studied. The increasing rotational speed significantly accelerates the particle movement of the active layer and raises the final oxidative yield of coal pitch spheres. By contrast, increasing the flow rate of air has little effect on the particle motion and oxidation yield of coal pitch.

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Discrete element simulation of particle motion in ball mills based on similarity

Abstract: This is a repository copy of Discrete element simulation of particle motion in ball mills based on similarity.

Cited by 35 publications

References 38 publications

Influence of random pore defects on failure mode and mechanical properties of SiC ceramics under uniaxial compression using discrete element method

Influence of random pore defects on failure mode and mechanical properties of SiC ceramics under uniaxial compression using discrete element method

Revealing the effect of decreased energy intensity of grinding in a tumbling mill during self-excitation of auto-oscillations of the intrachamber fill

Modeling of Oxidation Process of Coal Tar Pitch in Rotating Kilns

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