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作者： Jayasundara, C.T. Yang, R.Y. Yu, A.B. Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia

Particle flow in a stirred mill was modeled using discrete element method, focusing on the effect of mill properties and stirrer configurations, such as particle-wall friction, the size of disc holes, distance between stirrers, and stirrer shape, on the flow properties of grinding media. The flow properties were analyzed in terms of velocity field, porosity distribution, collision frequency, collision energy, impact energy, and power draw. The results indicate that although particle-wall sliding friction coefficient affects the energy transfer from discs to particles, too high a sliding friction may lead to a decrease in energy efficiency. The distance between discs significantly affects the circulation of grinding media between discs. Among the different stirrer types considered, energy transfer is more effective when disc holes are present. Pin stirrer shows increased grinding rates which also results in relatively high power consumption. Although different collision environments exist with different stirrer types, it is shown that the grinding rate can be determined by the first-order kinetics where the rate constant is dependent on the impact energy, for a given material. Grinding efficiency has been compared for different grinding materials under different operating conditions. The results suggest that selection of stirrer geometry also depends on the feed size and the type of material to be ground. Discussion has also been made of the usefulness of particle scale information in the design and control of stirred mills of different types. © 2011 American Chemical Society.

关键词： Grinding (machining)

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Effect of the size of media on grinding performance in stirred mills

Effect of the size of media on grinding performance in stirr...

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This work investigated the effect of grinding medium size on the wet milling performance in stirred mills using a combined numerical and experimental approach. Physical experiments were performed in a 1.4L stirred mill with the discs rotating at different speeds to grind aluminium hydroxide powders with different sized glass beads. The results showed that the grinding process followed the first order kinetics and the grinding rate increased with increasing disc speeds. While 4 mm glass beads had slightly larger grinding rates than 2 mm and 6 mm glass beads, the differences were generally within 5%, indicating their weak dependence. On the other hand, the energy consumption increased significantly for the large grinding media. simulations based on the combined discrete element method (DEM) and computational fluid dynamics (CFD) approach were performed under similar conditions. The simulated flow patterns and power draws were comparable to those measured. The total impact energy, which is the summation of all collision energy, had a unified power law relationship with the grinding rate for all grinding conditions. It is expected that the ratio of total impact energy and input power, which decreased for larger grinding media in the present study, can be used to describe the grinding efficiency. © 2011 Elsevier Ltd. All rights reserved.

关键词： Computational fluid dynamics

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Experimental studies of segregation in gas fluidization of ellipsoidal particles

Experimental studies of segregation in gas fluidization of e...

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11th International Conference on Fluidized Bed Technology, CFB 2014

作者： Gan, Jieqing Xu, Yingbo Zhou, Zongyan Yu, Aibing Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering The University of New South Wales Sydney NSW 2052 Australia

In this work, segregation of non-spherical particles in gas fluidization is studied by physical experiments. The shapes considered are spheroids with aspect ratio varying from 0.1 to 5.0. It is revealed that binary mixtures of ellipsoids have a higher minimum fluidization velocity than mono-shaped ellipsoids. Segregation occurs in binary-shaped mixtures within a narrow gas velocity range and large shape difference. Initial packing conditions have negligible influence on the final segregation degree.

关键词： Binary mixtures

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Aggregation Kinetics of Inclusions in Swirling Flow Tundish for Continuous Casting

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Journal of Iron and Steel Research International 2010年第5期17卷 6-10页

作者： YUE Qiang ZOU Zong-shu HOU Qin-fu School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia

The mechanism of inclusion aggregation in liquid steel in swirling flow tundish is analyzed by applying the theory of flocculation which was developed in the field of colloid engineering. The gas bridge forces due to the micro bubbles on hydrophobic inclusion surfaces were responsible for the inclusion collision and agglomeration, which can avoid the aggregation to breakup. The quantity of micro bubbles on hydrophobic inclusion particle is more than that on hydrophilic one. The trend of forming gas bridges between micro bubbles on particles is strong in the course of collision. The liquid film on hydrophobic particles is easy to break during collision process. Hydrophobic particles are liable to aggregate in collision. According to the analysis of forces on a nonmetallic inclusion particle in swirling chamber, the chance of inclusion collision and aggregation can be improved by the centripetal force. Hydropbobic particles in water are liable to aggregate in collision. Hydrophilic particles in water are dispersed although collision happens. The wettability can be changed by changing solid-liquid interface tension. The nonmetallic inclusion removal in swirling flow tundish is studied. The result shows that under certain turbulent conditions, *** concentration and the wettability between particles and liquid steel are the main factors to induce collision and aggregation.

关键词： collision aggregation wettability inclusion swirling chamber continuous casting tundish

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Corrigendum to “Boric acid-regulated gelation and ethanol-assisted preparation of polybenzoxazine aerogels” [Chem. Eng. J. 486 (2024) 150228]

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Chemical Engineering Journal 2025年 506卷

作者： Jinlong Zhou Yunyun Xiao Saihui Liu Zeyu Li Xinyi Liu Sizhao Zhang Zhengquan Li International Institute for Innovation Jiangxi University of Science and Technology Nanchang 330013 PR China Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Nanchang 330013 PR China School of Energy and Mechanics Jiangxi University of Science and Technology Nanchang 330013 P.R. China

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Effect of gravity on particle dispersion in a horizontally vibrating bed

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AIP Conference Proceedings 2013年第1期1542卷 823-826页

作者： Kejun Dong Kunio Shinohara Aibing Yu Laboratory for Computer Simulation and Modelling of Particulate Systems University of New South Wales Australia Particulate Chemical Eng. Laboratory Sapporo Japan

Particle dispersion in a horizontally vibrated vessel under microgravity is investigated by a discrete element method (DEM) based numerical model. The vessel is specially designed with the top corners being round shaped, which is to direct the particles inside under microgravity for outer space applications. The effect of gravity is particularly examined by a series of controlled numerical experiments. The dependence of the structure and dynamics of the system, in terms of spatial distribution, local packing density, velocity distribution and kinetic energy, on the magnitude of gravity are quantified. It is found that with the increase of gravity, more particles accumulate on the longitudinal walls, whereas the convective flow of the dispersed particles always exists, until the gravity reaches a certain value and most particles cannot be agitated. The round corner affects the local flow pattern but has limited effects on the overall system with the variance of gravity.

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A Numerical Study of Raceway Formation in an Ironmaking Blast Furnace

A Numerical Study of Raceway Formation in an Ironmaking Blas...

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第十届中国钢铁年会暨第六届宝钢学术年会

作者： Miao Zhen Zhou Zongyan Yu Aibing Laboratory of Simulation and Modelling of Particulate Systems Department of Chemical EngineeringMonash University

This work presents a numerical study of gas-solid flow in a blast furnace raceway region by CFD-DEM coupled approach. In the simulation, 120000 spherical particles with particle diameter of 80 mm are packed into a real blast furnace geometry. Blast is injected at high velocities to generate a void space in the front of tuyere. The results show that three types of raceways are formed, including anti-clockwise circulating motions of particles, clockwise circulating motions of particles, and plume-like raceway. The results are analysed mainly in terms of particle flow patterns, particle velocity, porosity,and gas flow field around the raceway region. The observation of two opposite circulating gas vortexes locating upon and below tuyere during raceway formation has a good agreement with experiments. Further, the effects of different variables such as tuyere length and angles, and particle properties on raceway size and shape are examined.

关键词： blast furnace raceway CFD-DEM solid flow

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Structural evolution in the packing of uniform spheres

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Physical Review E 2014年第3期89卷 032202-032202页

作者： Z. A. Tian K. J. Dong A. B. Yu []Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia

Structural analysis is very important to understanding the physics of atomic or particle systems of various types. However, properly characterizing the structures at different packing fraction ρ is still a challenge. Here we analyze the local structure, in terms of the so-called common-neighbor-subcluster (CNS), of sphere packings with ρ ∈ (0.2, 0.74). We show that although complicated in structure, there are totally 39 kinds of CNSs of which 12 are dominant. The evolution of these CNSs with the increase of ρ is quantified, and the rules governing the evolution are explored. The results are found to be useful in constructing a comprehensive picture about the critical states and their transition in sphere packing.

关键词： STRUCTURAL analysis (Engineering) PACKING fractions UNIFORM spaces PHASE transformations (Physics) MICROCLUSTERS CRITICAL point ATOMS

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Co-firing of coal and biomass in oxy-fuel fluidized bed for CO2 capture: A review of recent advances

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Chinese Journal of Chemical Engineering 2019年第10期27卷 2261-2272页

作者： Qinwen Liu Yan Shi Wenqi Zhong Aibing Yu Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Center for Simulation and Modelling of Particulate Systems Southeast University-Monash University Joint Research InstituteSuzhou 215000China 3 ARC Research Hub for Computational Particle TechnologyDepartment of Chemical EngineeringMonash UniversityClaytonVIC 3800Australia

The co-firing of coal and biomass in oxy-fuel fluidized beds is one of the most promising technologies for capturing *** technology has attracted wide attention from academia and industry in recent years as a negative emission method to capture CO2 produced by carbon contained in *** the past decades,many studies have been carried out regarding experiments and numerical simulations under oxy-fuel combustion *** paper firstly briefly discusses the techno-economic viability of the biomass and coal co-firing with oxycombustion and then presents a review of recent advancements involving experimental research and computational fluid dynamics(CFD)simulations in this *** studies on mechanism research,such as thermogravimetric analysis and tube furnace experiments,and fluidized bed experiments based on oxy-fuel fluidized beds with different sizes as well as the main findings,are summarized as a part of this *** has been recognized that CFD is a useful approach for understanding the behaviors of the co-firing of coal and biomass in oxyfuel fluidized *** summarize a recent survey of published CFD research on oxy-fuel fluidized bed combustion,which categorized into Eulerian and Lagrangian ***,we discuss the challenges and interests for future research.

关键词： Oxy-fuel combustion Co-firing of coal and biomass Oxy-fuel fluidized bed CFD simulation

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Engineering VO2 Nanoparticles for Energy and Environmental Applications

Engineering VO2 Nanoparticles for Energy and Environmental A...

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中国化学会第30届学术年会-论坛六：中澳科学家论坛

作者：蒋绪川 Laboratory for Simulation and Modelling of Particulate Systems(SIMPAS) Department of Chemical Engineering Monash University

Energy and environment have emerged as the most critical challenges human faced to the sustainable global developments in the 21 *** have attracted much more attention because of their unique functional properties and... 详细信息

关键词： Engineering VO2 Nanoparticles for Energy and Environmental Applications

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