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

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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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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3D CFD-DEM study of gas-solids flow and heat transfer in a full-loop circulating fluidized bed

3D CFD-DEM study of gas-solids flow and heat transfer in a f...

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11th International Conference on Fluidized Bed Technology, CFB 2014

作者： Wahyudi, H. Chu, K.W. Yu, A.B. Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering The University of New South Wales Sydney Australia

In this work, an extended CFD-DEM approach is developed to study the gas-solids flow and heat transfer between bed and riser wall in three-dimensional full-loop circulating fluidized bed. The effects of some operational, such as superficial gas velocity and solids inventory, on the heat transfer coefficient between bed and riser wall are investigated. The governing heat transfer modes such as wall-fluid convection, wall-particle conduction, are then discussed to gain better understanding about heat transfer between bed and wall in circulating fluidized beds. This work demonstrates that the developed 3D CFD-DEM approach could be a useful tool to study the coupled fluid flow and heat transfer in such a complex system.

关键词： Fluidization

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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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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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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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Application of DEM modelling to grinding processes

Application of DEM modelling to grinding processes

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World Congress on Intelligent Control and Automation (WCICA)

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

Understanding energy utilisation in grinding is critical to the process optimisation. In this paper, we demonstrated that the discrete element method (DEM) modelling, when combined with experimental measurements, can provide more realistic and reliable description of grinding processes. By incorporating particle grindability from experiments and energy condition from DEM simulations into a population balance model (PBM), we developed a multi-scale framework to predict mill performance. The model can be an invaluable tool in the design, control and optimisation of grinding processes.

关键词： Loading Media Powders Force Atmospheric modeling Predictive models Minerals

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Engineering Nanoparticles for Energy and Environmental Applications

Engineering Nanoparticles for Energy and Environmental Appli...

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主题：引领工业革命新浪潮——2014第四届国际纳米科技大会

作者： Xuchuan Jiang Laboratory for Simulation and Modelling of Particulate Systems (SIMPAS)School of Materials Science and Engineering The University of New South Wales

Energy and environment have emerged as the most critical challenges to the sustainable global developments in the 21st century. Nanomaterials have attracted much more attention because of their unique ftmctional properties and broad applications in energy and environment. This presentation is going to talk about how to engineer nanoparticles for energy and environmental applications, through the development of synthesis strategies of metal oxide nanoparticles, fundamental understandings of particle growth and understanding the relationship between structure and functions, specificallyfocusing on gas sensors, smart window coatings and self-cleaning films in this talk.

关键词： Engineering Nanoparticles for Energy and Environmental Applications

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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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CFD modelling in Blast Furnace Ironmaking

CFD Modelling in Blast Furnace Ironmaking

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第九届中国钢铁年会

作者： Yansong Shen Aibing Yu Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and EngineeringThe University of New South Wales

Steel industry is one of the most energy-intensive industries,accounting for % of world greenhouse gas *** processes account for 0% of emissions in a steel *** understanding and optimization of blast furnace process is important in order to be competitive and sustainable under increasingly demanding *** modelling,facilitated by physical modelling,provides a cost-effective way for process design and *** particular,CFD modelling is widely used in academia and industry for its efficiency and *** study will discuss the role of CFD-based process models in the development of new technology for sustainable *** examples are used:modelling of a recent technologypulverized coal injection (Fig.1);and modelling of the whole blast furnace operation (Fig.2).It is demonstrated that CFD modelling indeed plays a significant role in process understanding and optimization,important to sustainable blast furnace ironmaking.

关键词： ironmaking blast furnace CFD

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