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SSRN 2023年

作者： Xiong, Shixian Ke, Hongcheng Cao, Lei Wang, Yu Zhu, Qian Zhong, Liqin Fan, Lanlan Gu, Feng Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems International Institute for Innovation Jiangxi University of Science and Technology Nanchang330013 China

Exploring cathode materials that combine excellent cycling stability and high energy density remains challenging for aqueous zinc ion hybrid supercapacitors (ZHSCs). Herein, polyaniline (PANI) coated BCN nanoarray on carbon cloth surface is prepared as advanced cathode materials via simple high-temperature calcination and electrochemical deposition methods. Due to the high specific capacity and conductivity of PANI, the CC@BCN@PANI core-shell nanoarrays cathode shows excellent ion storage capability. Furthermore, the 3D nanoarray structure can provide enough space for the volume expansion and contraction of PANI during the charging and discharging process, which effectively avoids the collapse of the microstructure and greatly improves the electrochemical stability of PANI. Therefore, the CC@BCN@PANI based ZHSCs exhibit the superior electrochemical performances with a high capacity of 145.8 mAh g-1 (0.5 A g-1), a high energy and power density of 116.78 Wh kg-1 and 12 W kg-1, and a high-capacity retention rate of 86.2% at 2 A g-1 after 8000 cycles. In addition, the flexible Zn-ion hybrid supercapacitors (FZHSCs) are also investigated, and show a high capacity of 160 mAh g-1 (0.1 A g-1), and a capacity retention rate of 87.7% at 2 A g-1 after 450 cycles. © 2023, The Authors. All rights reserved.

关键词： Cathodes

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simulations on mixing behaivors of superheated steam, heat-carrier and biomass particles

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Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 2016年第5期37卷 1021-1026页

作者： Liu, Xue-Jiao Zhong, Wen-Qi Yu, Ai-Bing Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast University Nanjing210096 China Centre for Simulation and Modelling of Particulate Systems Southeast University-Monash University Joint Research Institute Suzhou215123 China Department of Chemical Engineering Monash University ClaytonVIC3800 Australia

A three-dimensional Eulerian-Eulerian multiphase model (two-fluid model, TFM) was developed to simulate the three-phase mixing behaviors of superheated steam, heat-carrier and biomass particles in an industrial-scale spout-fluid bed mixer. The superheated steam was treated as continuous primary phase simulated by the k-Ε two-equation turbulent model, while the heat-carrier and biomass were treated as two different secondary phases, and their viscosities and pressures were provided by the Kinetic theory of granular flow. The interactions between gas phase and each solid phase are described by Symbol-O'Brein drag model, while the interaction between two solid phases is described by morsi-alexander model. Heat transfers between gas phase and solid phases were calculated by Gunn model. Based on above models, the mixing effectiveness of the mixer was valuated and the effects of material properties on the heat transfer between phases were numerically investigated. Results show that the mixing effectivenss of spout-fluid mixer can reach over 70% and the final temperature of biomass is most sensitive to the size of biomass particle. © 2016, Science Press. All right reserved.

关键词： Computational fluid dynamics

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Microscopic analysis of Hopper flow with ellipsoidal particles

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AIP Conference Proceedings 2013年第1期1542卷 694-697页

作者： Sida Liu Zongyan Zhou Ruiping Zou David Pinson Aibing Yu Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering The University of New South Wales Sydney NSW 2052 Australia Steelmaking Technology and Planning BlueScope Steel P.O. Box 202 Port Kembla NSW 2505 Australia

Hoppers are widely used in process industries. With such widespread application, difficulties in achieving desired operational behaviors have led to extensive experimental and mathematical studies in the past decades. Particularly, the discrete element method has become one of the most important simulation tools for design and analysis. So far, most studies are on spherical particles for computational convenience. In this work, ellipsoidal particles are used as they can represent a large variation of particle shapes. Hopper flow with ellipsoidal particles is presented highlighting the effect of particle shape on the microscopic properties.

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Discrete modelling of the packing of ellipsoidal particles

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AIP Conference Proceedings 2013年第1期1542卷 357-360页

作者： Zongyan Zhou Ruiping Zou David Pinson Aibing Yu Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering The University of New South Wales Sydney NSW 2052 Australia Steelmaking Technology and Planning BlueScope Steel P.O. Box 202 Port Kembla NSW 2505 Australia

Particle shape affects the packing characteristics significantly. Such a topic has been investigated extensively in the literature by physical experiments or mathematical modelling. In this paper, we give a summary of packing of ellipsoidal particles using discrete element method. As ellipsoidal particles can represent a large number of shapes, e.g. from platy to elongated, the relationships between packing properties (such as packing fraction, coordination number and radial distribution function) and aspect ratios are established. Flow and force structures are also presented to illustrate how the shape affects those microscopic properties for further fundamental understanding. The results demonstrate that discrete element method provides a useful method to investigate the packing dynamics of ellipsoidal particles.

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The demagnetization factor for randomly packed spheroidal particles

arXiv

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arXiv 2019年

作者： Bjørk, R. Zhou, Z. Department of Energy Conversion and Storage Technical University of Denmark - DTU Frederiksborgvej 399 RoskildeDK-4000 Denmark Laboratory for Simulation and Modelling of Particulate Systems Department of Chemical Engineering Monash University ClaytonVIC3800 Australia

We investigate if the demagnetization factor for a randomly packed powder of magnetic spheroidal particles depend on the shape of the spheroidal particles and what the internal variation in magnetization is within such a powder. A spheroid is an ellipsoid of revolution, i.e. an ellipsoid with two semi-major axis being equal. The demagnetization factor is calculated as function of particle aspect ratio using two independent numerical models for several different packings, and assuming a relative permeability of 2. The calculated demagnetization factor is shown to depend on particle aspect ratio, not because of direct magnetic interaction but because the particle packing depend on the aspect ratio of the particles. The relative standard deviation of the magnetization across the powder was 3%-8%, increasing as the particle shape deviates from spherical, while the relative standard deviation within each particle was relatively constant around 5%. Copyright © 2019, The Authors. All rights reserved.

关键词： Magnetization

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Improved Ductility by Reducing Powder Size in Laser Powder Bed Fusion of AlSi10Mg

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Additive Manufacturing Frontiers 2024年第1期3卷 160-172页

作者： Fuzhong Chu Haopeng Shen Jianwen Li Juan Hou Kai Zhang Zongyan Zhou Yuman Zhu Xinhua Wu Aijun Huang ARC Research Hub for Computational Particle Technology Department of Chemical and Biological EngineeringMonash UniversityClaytonVIC 3800Australia Monash Centre for Additive Manufacturing Monash UniversityNotting HillVIC 3168Australia Department of Materials Science and Engineering Monash UniversityClaytonVIC 3800Australia School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai200093China Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and TechnologyNanchang330013China

Strict control of powder properties,especially particle size distribution(PSD),is critical in the laser powder bed fusion(LPBF)process to ensure the quality of the fabricated *** work shows that reducing the powder size could improve the ductility of LPBF fabricated *** tensile elongation increased from 4.1%to 8.8%when AlSi10Mg powder sizes(D50 value)decreased from 76μm to 16μm in the as-fabricated *** results showed that fine powder size stimulates epitaxial grain growth due to excessive *** presence of epitaxial columnar grains makes the crack path across inner melt pools more frequent and travels from the coarse melt pool zones to the fine melt pool *** work suggests that powder size is a crucial factor to be considered in maintaining repeatable mechanical properties in LPBF processes,particularly when ductility and ductility-dominated properties are critical.

关键词： Particle size distribution Laser powder bed fusion Ductility Epitaxial columnar grain

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Numerical investigation of burden distribution m a blast furnace bell -less top

Numerical investigation of burden distribution m a blast fur...

引用

第五届宝钢学术年会

作者： LIU Sida ZHOU Zongyan YU Aibing PINSON David TSAIAPATIS John Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engin Steelmaking Technology and Planning BlueScope SteelP. O. Box 202Port KemblaNSW 2505Australia OneSteel Whyalla SA 5600Australia

Burden distribution plays an important role in achieving the stable and efficient operation in a modem ironmaking blast furnace ( BF).Granular materials such as coke and ore are discharged from hoppers,descend to rotating chutes,and generate impaction on the burden *** efforts have been made to investigate this *** this work,a 3D DEM - based model framework is established and used to study burden distribution in the scaled OneSteel BF top *** results are compared with experiments,showing a good *** indicates that the proposed DEM is capable of the investigation of BF burden distribution for further fundamental understanding.

关键词： blast furnace bell - less top burden distribution discrete element method

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Particle-Scale modelling of Injected Hydrogen and Coke Co-Combustion in the Raceway of an Ironmaking Blast Furnace

SSRN

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SSRN 2022年

作者： Dianyu, E. Zhou, Peng Ji, Langyong Cui, Jiaxin Xu, Qiang Guo, Liejin Yu, Aibing International Institute for Innovation Jiangxi University of Science and Technology Ganzhou341000 China Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and Technology Ganzhou341000 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China ARC Research Hub for Computational Particle Technology Department of Chemical Engineering Monash University VIC3800 Australia Centre for Simulation and Modelling of Particulate Systems Southeast University Monash University Joint Research Institute Suzhou215123 China

Hydrogen is an environmentally friendly fuel that does not produce greenhouse gas (GHG) emissions. Its applications have attracted significant attention from many industries, especially the ironmaking industry, which consumes massive amounts of fossil energy. The injection of hydrogen into a blast furnace (BF) is one of the most promising low-carbon ironmaking routines. In this study, an experimentally validated CFD-DEM model is adopted to investigate the dynamics, microstructure and thermochemical behaviours in the raceway of a BF with hydrogen injection operations (HIOs), which include raceway evolution, force distribution and the co-combustion characteristics of hydrogen and coke. Some significant features are obtained through comparison analyses between HIOs and air injection operations (AIOs). In particular, the effects of the hydrogen injection concentration on the raceway size, gas temperature and components are studied. The simulation results show that a smaller raceway is formed under HIOs in comparison with that of AIOs. In addition, the gas temperature is higher near the tuyere but lower along the tuyere axis, and the oxygen consumption is larger and produces more CO. As the hydrogen injection concentration increases: (i) the raceway size and gas temperature decrease;(ii) the CO is generated at the early stage and the maximum CO2 concentration moves to inlet direction along the tuyere axis. The results provide insights on the fundamental understanding of low-carbon ironmaking BF technology. © 2022, The Authors. All rights reserved.

关键词： Blast furnaces

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Cooling rate dependence of polymorph selection during rapid solidification of liquid metal zinc

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Transactions of Nonferrous Metals Society of China 2015年第12期25卷 4072-4079页

作者：田泽安周丽丽莫云飞梁永超刘让苏贵州大学大数据与信息工程学院贵阳550025 赣南医学院信息工程学院赣州341000 Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales 湖南大学物理与微电子科学学院长沙410082

The polymorph selection during rapid solidification of zinc melt was investigated by molecular dynamics simulation. Several methods including g（r）, energy, CNS, basic cluster and visualization were used to analyze the results. The results reveal that the cooling rate has no observable effect on the microstructure as TTc（Tc is the onset temperature of crystallization）; and at the first stage of crystallization, although microstructures are different, the morphologies of nucleus are similar, which are composed of HCP and FCC layers; the polymorph selection of cooling rate finally takes place at the second stage of crystallization： at a high cooling rate, the rapid increase of FCC atoms leads to a FCC crystal mixed with less HCP structures; while at a low cooling rate, HCP atoms grow at the expense of FCC atoms, resulting in an almost perfect HCP phase. The results reveal that the cooling rate is one of the important factors for polymorph selection.

关键词： polymorph selection crystal structure rapid solidification metal zinc molecular dynamics simulation

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Impaction of particle streams on a granular bed

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AIP Conference Proceedings 2013年第1期1542卷 634-637页

作者： Sida Liu Zongyan Zhou Kejun Dong Aibing Yu John Tsalapatis David Pinson Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering The University of New South Wales Sydney NSW 2052 Australia OneSteel Whyalla SA 5600 Australia Steelmaking Technology and Planning BlueScope Steel P.O. Box 202 Port Kembla NSW 2505 Australia

Impaction of particle streams on granular beds can be observed in various processes. One typical example is the burden distribution in an ironmaking blast furnace. The stream of heavy iron-bearing pellets impacts the pre-formed coke surface at the blast furnace throat region. The coke layer then can move and collapse. The formed burden profile is important in controlling the radial distribution of gas flow, and hence productivity and stability. In this paper, the impaction of pellets on the coke surface is investigated using discrete element method. A 90 degree sector is modelled with a pre-formed coke surface impacted by pellets flowing from a rotating chute. Microscopic analysis on the flow and force structures is carried out to examine the impaction with different chute angles and discharge rates.

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