检索结果-内蒙古大学图书馆

Particle scale investigation of flow and mixing of wet particles in rotating drums

AIP Conference Proceedings 2013年第1期1542卷 963-966页

作者： P. Y. Liu R. Y. Yang 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

Granular flow in rotating drums exhibits complex phenomena which are further complicated by the presence of liquids. This paper reviews our recent work on flow of wet particles in rotating drums based on the discrete element method (DEM) simulations. The DEM model was validated by comparing the simulation results with experimental measurements. Particle flow at quasi-static and dynamic states was investigated. In the quasi-static state with the drum rotating at low speeds, wet particle bed failed through avalanche and slow structural change was identified prior to the avalanches. In the dynamic state, flow transited from continuous to avalanche flow with increasing liquid surface tension and a plug flow was developed on the bed surface. Particle mixing in both transverse and axial directions was studied. While cohesion in general reduced transverse mixing, enhanced mixing of wet particles was also observed, which was explained by a theory based on particle circulation period. On the other hand, the axial mixing was well described by Fick’s law of diffusion and particle diffusivity decreased with increasing cohesion. A correlation was observed between particle diffusivity and granular temperature.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Particle scale modelling of the multiphase flow in a dense medium cyclone: Effect of fluctuation of solids flowrate

Particle scale modelling of the multiphase flow in a dense m...

引用

作者： Chu, K.W. Kuang, S.B. Yu, A.B. Vince, A. Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia Elsa Consulting Group Pty. Ltd. PO Box 8100 Mt. Pleasant QLD 4740 Australia

Dense medium cyclone (DMC) is widely used to upgrade run-of-mine coal in the coal industry. The flow dynamics/fluctuation in a DMC is important but has not been studied previously. In this work, the dynamics is studied by numerically with special reference to the effect of the fluctuation of solid mass flowrate. The simulation is carried out by use of a combined approach of Computational Fluid Dynamics (CFD) and Discrete Element Method (DEM). In the model, the motion of discrete mineral particle phase is obtained by DEM which applies Newton's equations of motion to every individual particle and the flow of medium (mixture of water, air and fine magnetites) phase by the traditional CFD which solves the Navier-Stokes equations at a computational cell scale. The simulated results are analysed in terms of medium and coal flow patterns, and particle-fluid, particle-particle and particle-wall interaction forces. It is shown that under high fluctuation frequency and current conditions, the performance of DMC is not sensitive to both the fluctuation amplitude and period of coal flow at the DMC inlet. However, under low fluctuation frequency, as fluctuation amplitude increases, the separation performance deteriorates slightly and the flow is obviously affected at the spigot. A notable finding is that the near-gravity particles that tend to reside at the spigot and/or have longer residence time in the DMC would be affected more than other particles. The work shows that this two-way coupled CFD-DEM model could be a useful tool to study the dynamics of the flow in DMCs. © 2011 Elsevier Ltd. All rights reserved.

关键词： Computational fluid dynamics

来源：评论

学校读者我要写书评

暂无评论

Numerical study of effects of hydrogen addition on methane combustion behaviors

引用

Journal of Iron and Steel Research International 2023年第11期30卷 2173-2185页

作者： Dian-yu E Ling-yi Weng Guang-wu Tang Jing Li Guang-chao Wei Jia-xin Cui Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and TechnologyNanchang330013JiangxiChina International Institute for Innovation Jiangxi University of Science and TechnologyNanchang330013JiangxiChina Shenzhen Smoore Technology Limited Shenzhen518102GuangdongChina ARC Research Hub for Computational Particle Technology Department of Chemical and Biological EngineeringMonash UniversityClaytonVIC3800Australia School of Transportation and Vehicle Engineering Shandong University of TechnologyZibo255000ShandongChina

The methane combustion with hydrogen addition can effectively reduce carbon emissions in the iron and steel making industry,while the combustion mechanism is still poorly *** oxy-fuel combustion of methane with hydrogen addition in a 0.8 MW oxy-natural gas combustion experimental furnace was numerically studied to investigate six different combustion *** results show that the 28-step chemical reaction mechanism is the optimal recommendation for the simulation balancing the numerical accuracy and computational *** the hydrogen enrichment increases in fuel,the highest flame temperature ***,the chemical reaction accelerates with enlarging the peak of the highest flame temperature and intermediate OH *** the hydrogen enrichment reaches 75 vol.%,the flame front is the farthest,and the flame high-temperature zone occupies the largest proportion corresponding to the most vigorous chemical reactions in the same oxygen supply.

关键词： Oxy-fuel combustion Hydrogen Combustion mechanism Flame temperature simulation Modeling

来源：评论

学校读者我要写书评

暂无评论

Some Challenging Problems in Discrete Element modelling of particulate systems

Some Challenging Problems in Discrete Element Modelling of P...

引用

中国力学学会2012颗粒材料计算力学学术会议

作者： Yu Ai-Bing Laboratory for Simulation and Modelling of Particulate Systems (Simpas)School of Materials Science and Engineering The University of New South Wales Sydney NSW 2052 Australia

Particle science and technology is a rapidly developing interdisciplinary research area with its core being the understanding of the relationships between micro-and macro-scopic properties of particulate/granular matter-a state of matter that is widely encountered but poorly *** macroscopic behaviour of particulate matter is controlled by the interactions between individual particles as well as interactions with surrounding fluids and wall.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Effect of cohesive force on the formation of a sandpile

引用

AIP Conference Proceedings 2013年第1期1542卷 646-649页

作者： K. J. Dong R. P. Zou K. W. Chu R. Y. Yang A. B. Yu D. S. Hu Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney 2052 NSW Australia The Research Institute of Baosteel Shanghai China

This paper presents a numerical study on the piling processes of mono-sized wet particles by the discrete element method (DEM). The capillary force between particles due to liquid bridge is implemented in an existing DEM model. The effects of moisture content on the repose angle and structure of a pile are studied by a series of controlled numerical experiments. It is confirmed that the structure of a pile is similar to that of a packing for cohesive particles. Moreover, the averaged local porosity and repose angle have similar changes with the moisture content and can be linearly correlated. Therefore, the relationship between the repose angle and the cohesive force can be established based on the previous correlation between the porosity and the force ratio of the cohesive force to gravity developed in the packing of cohesive particles.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Foreword

引用

Powder Technology 2013年 240卷 1-1页

作者： Yu, Aibing Chan, Kim Litster, Jim Yang, Runyu Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia Faculty of Pharmacy University of Sydney NSW 2006 Australia School of Chemical Engineering Purdue University West Lafayette IN 47907 United States Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia

来源：评论

学校读者我要写书评

暂无评论

Size-induced axial segregation of binary mixtures in rotating drum of different lengths

引用

Chemical Engineering Science 2025年 316卷

作者： Jielong He Yuelei Wang Liuyimei Yang Jin Xu Qijun Zheng Sida Liu Zongyan Zhou Jiangxi Provincial Key Laboratory of Particle Technology Jiangxi University of Science and Technology Nanchang 330013 China Research Centre for Intelligent Mineral Processing & Metallurgy International Institute for Innovation Jiangxi University of Science and Technology Nanchang 330013 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou 341000 China Centre for Simulation and Modelling of Particulate Systems Monash-Southeast University Joint Research Institute Suzhou 215123 China ARC Research Hub for Smart Process Design and Control Department of Chemical and Biological Engineering Monash University Melbourne VIC 3800 Australia

This study investigates the size-induced axial segregation of binary mixtures in rotating drums, particularly focusing on the effect of drum length. The results indicate that long drums require more time to achieve stable segregation and form more segregation bands. The core region under the free bed surface remains predominantly filled with small particles, indicating that radial segregation occurs simultaneously with the axial segregation. The angle of repose of large particle bands is consistently greater than that of small particle bands, which drives the migration of large particles. Short drums are more sensitive to changes in rotational speed, while long drums with moderate rotational speed promote the formation of segregation bands. The width of small particle bands shows an increasing–decreasing-stabilizing trend with the drum length increasing. An analysis of particle velocities reveals that the characteristics of segregation bands are closely related to the relative velocity difference between large and small particles.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A 3D CFD simulation of liquid flow in an ironmaking blast furnace

引用

AIP Conference Proceedings 2013年第1期1547卷 555-563页

作者： Yansong Shen Baoyu Guo Sheng Chew Peter Austin 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 BlueScope Steel Research P.O. Box 202 Port Kembla NSW 2505 Australia

A three-dimensional CFX-based mathematical model is developed to describe the flow-heat transfer-chemical reactions behaviours of gas-solid-liquid phases in an ironmaking blast furnace (BF), where the raceway cavity is considered explicitly. The typical in-furnace phenomena of an operating blast furnace, in particular, the liquid flow in the lower part of a blast furnace is simulated in aspects of velocity and volume fraction. This model offers a cost-effective tool to understand and optimize blast furnace operation.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Compare pilot-scale and industry-scale models of pulverized coal combustion in an ironmaking blast furnace

引用

AIP Conference Proceedings 2013年第1期1547卷 564-571页

作者： Yansong Shen Aibing Yu Paul Zulli Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering The University of New South Wales Sydney NSW 2052 Australia BlueScope Steel Research P.O. Box 202 Port Kembla NSW 2505 Australia

In order to understand the complex phenomena of pulverized coal injection (PCI) process in blast furnace (BF), mathematical models have been developed at different scales: pilot-scale model of coal combustion and industry-scale model (in-furnace model) of coal/coke combustion in a real BF respectively. This paper compares these PCI models in aspects of model developments and model capability. The model development is discussed in terms of model formulation, their new features and geometry/regions considered. The model capability is then discussed in terms of main findings followed by the model evaluation on their advantages and limitations. It is indicated that these PCI models are all able to describe PCI operation qualitatively. The in-furnace model is more reliable for simulating in-furnace phenomena of PCI operation qualitatively and quantitatively. These models are useful for understanding the flow-thermo-chemical behaviors and then optimizing the PCI operation in practice.

关键词：

来源：评论

学校读者我要写书评

暂无评论

modelling the combustion of charcoal in a model blast furnace

引用

AIP Conference Proceedings 2013年第1期1547卷 78-87页

作者： Yansong Shen Tomo Shiozawa Aibing Yu Peter Austin Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering The University of New South Wales Sydney NSW 2052 Australia BlueScope Steel Research P.O. Box 202 Port Kembla NSW 2505 Australia

The pulverized charcoal (PCH) combustion in ironmaking blast furnaces is abstracting remarkable attention due to various benefits such as lowering CO2 emission. In this study, a three-dimensional CFD model is used to simulate the flow and thermo-chemical behaviours in this process. The model is validated against the experimental results from a pilot-scale combustion test rig for a range of conditions. The typical flow and thermo-chemical phenomena is simulated. The effect of charcoal type, i.e. VM content is examined, showing that the burnout increases with VM content in a linear relationship. This model provides an effective way for designing and optimizing PCH operation in blast furnace practice.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：