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A classification AI model to predict choking of vibrating screen based on DEM and machine learning

Powder Technology 2025年 460卷

作者： Arifuzzaman, S.M. Dong, Kejun Zou, Ruiping Yu, Aibing Centre for Infrastructure Engineering School of Engineering Design and Built Environment Western Sydney University NSW2751 Australia ARC Research Hub for Smart Process Design and Control Department of Chemical Engineering Monash University ClaytonVIC3800 Australia

Screening is a complicated process for classifying granular materials according to size. Choking is a vital issue in screening. It may occur when the particle flow along a screen is too slow, but slow particle flow and long residence time are beneficial to sieving performance. Therefore, a model to judge whether choking happens is useful for finding optimal operating conditions. Here, a classification model to predict screen choking is proposed by combining DEM simulation and machine learning. The model can consider various key controlling variables for particle properties and operating conditions. Using the model, safe operation condition regions without choking can be identified. Then, combining the model with our previous machine learning based process model, we can design a screening process with the desired performance. The work also shows a way of using machine learning to predict critical phenomena in particle flow. © 2025 The Authors

关键词： Consolidation

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Numerical analysis of liquid flow in ironmaking blast furnace (BF) and its impact on BF performance

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Powder Technology 2025年 462卷

作者： Liu, Yancong Jiao, Lulu Kuang, Shibo Yu, Aibing ARC Research Hub for Smart Process Design and Control Department of Chemical and Biological Engineering Monash University ClaytonVIC3800 Australia School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing100083 China

Various types of iron ores used in the blast furnace (BF) ironmaking process lead to different properties of the liquid flowing through the coke bed in the lower part, significantly influencing BF performance. This paper presents a numerical study of BF operations under different liquid conditions using a CFD process model. In this model, the force balance model that describes the liquid flow is modified to consider liquid viscosity and coke particle size explicitly. Using the model, the effects of different liquid viscosities corresponding to various iron ores are mainly studied based on a 5000-m3 industrial BF. These effects are also analyzed at various coke sizes. The numerical results show that as the liquid viscosity rises, the pressure drop first decreases and then increases, potentially leading to operation instability at high viscosities. These opposite trends of pressure drop result from the combined effects of increased liquid holdup and a thinned cohesive zone (CZ). Additionally, a higher liquid viscosity reduces the liquid temperature due to reduced solid-liquid heat transfer efficiency. The interaction between coke size and liquid viscosity complicates the above behavior, mainly through the influences on CZ thickness, liquid holdup, and solid-liquid heat transfer. This work provides insights to highlight the significance of liquid inside BF. © 2024

关键词： Iron analysis

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Numerical modelling of the hydrogen production from biomass and supercritical water and the scale-up criterion

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International Journal of Hydrogen Energy 2025年 139卷 11-24页

作者： Ma, Shaoli Yang, Liuyimei Wu, Yinghui Zheng, Qijun School of Rare Earths University of Science and Technology of China Hefei230026 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341100 China ARC Research Hub for Smart Process Design and Control Department of Chemical and Biological Engineering Monash University Clayton Victoria3800 Australia Department of Mechanical and Aerospace Engineering Monash University Clayton Vic3800 Australia

The supercritical water fluidized bed is widely used for hydrogen production from gasified biomass. This paper utilizes a two-fluid model (TFM) to simulate the thermochemical process of biomass in the supercritical water fluidized bed, focusing on evaluating the validity of different scaling-up laws for the studied reactor. The H2 yields of the glucose-xylose-guaiacol reaction system scaled up with the simplified dimensionless parameter set are 12.36 %, 13.57 %, and 24.27 % higher than those of the glucose reaction system scaled up with the simplified dimensionless parameter set, and 11.4 %, 13.88 % and 24.13 % higher than those of the glucose reaction system scaled up with the viscosity-limited dimensionless parameter set, respectively. For a supercritical water fluidized bed reactor, the dimensionless parameters s, Fr = (u0)2/(gL0), ρs/ρf, u0/umf, L1/L2 and Φ> are essential for scale-up of the reactor, particularly the gas-solid density ratio and solids Reynolds number. It is also demonstrated that the volumetric fraction of bubbles plays a significant role in enhancing the mass transfer between different phases and can effectively promote the H2 yield by approximately 0.5 mol/kg. The turbulence intensity of the supercritical water exerts a mild influence on the H2 yield. © 2025 Hydrogen Energy Publications LLC

关键词： Diffusion in liquids

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CFD-DEM study of heat transfer and particle dissolution in stirred tanks

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Chemical Engineering Science 2025年 315卷

作者： Wang, Yide Li, Zhengquan Li, Kaixuan Zhang, Boqun Chen, Huimin Zhou, Qiang Zhou, Zongyan Jiangxi Provincial Key Laboratory of Particle Technology Jiangxi University of Science and Technology Ganzhou341000 China School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an710049 China ARC Research Hub for Smart Process Design and Control Department of Chemical and Biological Engineering Monash University MelbourneVIC3800 Australia

The CFD-DEM method combined with the Noyes-Whitney dissolution control equation was used to study the effects of fluid–solid heat transfer on particle dissolution within a stirred tank. The model's simulation accuracy for particle size and solute concentration has been validated in a published paper. To further validate the model's ability to simulate heat transfer, a fluidized bed experiment was incorporated, and the error of average particle temperature change was only 1.03%. Then the effects of different initial fluid temperatures and various particle sizes on heat transfer and dissolution mass transfer was studied. Results indicate that a higher initial fluid temperature leads to a faster temperature increase and a higher dissolution rate of particles. However, as particles dissolve and their temperature continues to rise, the heat transfer efficiency between the fluid and particles decrease. Smaller particles, with a larger specific surface area, achieve faster mass transfer rates and higher heat transfer efficiency. © 2025 Elsevier Ltd

关键词： Electric heating

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A New Approach for Scale-Up of Pulsed Disc and Doughnut Columns Based on the Similarity Principle

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SSRN 2024年

作者： Xu, Dongbing Wang, Chi Chang, Chao Tan, Boren Yu, Xiaohua Duan, Xiaofei Wang, Yong Chen, Feiyue National Engineering Research Center of Green Recycling for Strategic Metal Resources Institute of Process Engineering Chinese Academy of Sciences Beijing100090 China University of Chinese Academy of Sciences Beijing100049 China School of Chemical Engineering and Technology China University of Mining and Technology Xuzhou221116 China ARC Research Hub for Smart Process Design and Control Department of Chemical & Biological Engineering Monash University ClaytonVIC3800 Australia Kunming University of Science and Technology China Melbourne TrACEES Platform and School of Chemistry Australia Nanjing IPE Institute of Green Manufacturing Industry China

A detailed experimental study is performed to understand the effect of scaling up on the hydrodynamic behavior of Pulsed Disc and Doughnut Columns (PDDCs) using three different systems without mass transfer. The phase system used in the experiments consists of tap water as the dispersed phase and 10% P507/kerosene with different saponification rates as the continuous phase. Dispersed phase holdup and Sauter mean diameter (d32) were measured under different operating conditions. The operating parameters that have varied are the pulsation intensity and flow rate of both liquid phases. The geometrical parameters are plate spacing spacing and column diameter. Further, the empirical correlations based on the similarity principle have been proposed to predict the dispersed phased holdup and Sauter mean diameter for a better understanding of the scale-up process. © 2024, The Authors. All rights reserved.

关键词： Mass transfer

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Hydrodynamics of heterogeneous particle swarms in gas-liquid-solid stirred tanks with free surface studied by DEM-VOF

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Powder Technology 2025年 462卷

作者： E, Dianyu Wen, Yingming Wu, Yiliu Li, Jing Sun, Weifu Liu, Yonggang Chen, Chao Cui, Jiaxin Qiu, Yinxuan Jiangxi Provincial Key Laboratory of Particle Technology Jiangxi University of Science and Technology Nanchang330013 China Research Centre for Intelligent Mineral Processing & Metallurgy International Institute for Innovation Jiangxi University of Science and Technology Nanchang330013 China ARC Research Hub for Smart Process Design and Control Department of Chemical and Biological Engineering Monash University VIC3800 Australia School of Civil Engineering Southeast University Nanjing211189 China Advanced Technology Research Institute Beijing Institute of Technology Jinan250307 China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and Technology Ganzhou341000 China Xinyu Iron and Steel Group Co. Ltd Xinyu338001 China College of Materials Science and Engineering Taiyuan University of Technology Taiyuan030024 China School of Chemical Engineering The University of Queensland QLD4072 Australia

Stirred tanks play a pivotal role in material blending, yet there is still a lack of data on inner complex blending mechanism, especially involving heterogeneous particle swarm with different shape combinations. This study extensively develops the DEM-VOF model, in which different drag force models are applied based on the identification of particle shapes. It aims to provide an insight into the blending system dynamics of heterogeneous particle swarms through seven arranged particle schemes building upon three different shapes. The results show that the oblate-prolate ellipsoid particle scheme has the optimal suspension performance, but demonstrates high power consumption. The addition of spherical particles into the oblate-prolate ellipsoid particle scheme has significant effect on particle suspension, fluid flow and the evolution of free surface, while contributes to a reduction in power consumption. This study presents an analysis of the hydrodynamics and optimization of blending systems involving heterogeneous particle swarms in stirred tanks. © 2025 Elsevier B.V.

关键词： Flow of gases

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

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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.

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Dual-Band Electrochromic smart Window for Dynamic Switching Between Radiative Cooling and Solar Heating

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Advanced Science 2025年 e04483页

作者： Zhao, Xinyu Chen, Qixiang Fan, Fan Wang, Qiliang Su, Yuehong Liu, Minsu Zhu, Fahua Zhao, Dongliang School of Energy and Environment Southeast University Jiangsu Nanjing210096 China Department of Architecture and Built Environment University of Nottingham NottinghamNG7 2RD United Kingdom ARC Research Hub for Smart Process Design and Control Department of Chemical Engineering Monash University MelbourneVIC3800 Australia State Key Laboratory of Low-carbon Smart Coal-fired Power Generation and Ultra-clean Emission China Energy Science and Technology Research Institute Co. Ltd. Nanjing210023 China Institute of Science and Technology for Carbon Neutrality Southeast University Nanjing210096 China Institute for Carbon Neutral Development Southeast University Jiangsu Nanjing210096 China

Electrochromic smart windows can actively modulate their reversible transition between transparent and opaque states, adapting to varying climatic conditions and thereby offering a sustainable solution for energy-efficient buildings. However, the operational range of current electrochromic smart windows is mostly limited to the solar spectrum. Expanding this range into the mid-infrared spectrum could significantly enhance their energy-saving capabilities. In this study, a dynamic electrochromic (EC) glass that integrates silver electrodeposition/dissolution with mechanical flipping of the glass panel is designed. This design enables bidirectional dynamic modulation of both the solar spectrum (0.3–2.5 µm) and mid-infrared spectrum (2.5–20 µm), with solar reflectance varying between 87.9% and 19.9%, and mid-infrared emissivity varying between 90.6% and 10.8%. Consequently, the EC glass can dynamically switch between radiative cooling and solar heating modes. The simulation results show that the architectural application of this EC glass, with climate-specific operating modes, can achieve a maximum of over 50% annual heating, ventilation, and air conditioning (HVAC) energy savings, contributing to carbon neutrality and sustainable development. © 2025 The Author(s). Advanced Science published by Wiley-VCH GmbH.

关键词： Energy efficiency

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Investigation of anisotropic thermophysical properties of highly oriented carbon fiber composites: From one to three dimensions

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Carbon 2025年 243卷

作者： Yanhui Zhang Jie Yang Xiaoyu Zhang Rui Xu Minsu Liu Aoran Fan Yingjun Liu Jianli Wang Xing Zhang Jiangsu Key Laboratory for Design and Manufacturing of Precision Medicine Equipment Department of Mechanical Engineering Southeast University Nanjing 210096 China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua University Beijing 100084 China Monash Suzhou Research Institute Monash University Suzhou 215000 China ARC Research Hub for Smart Process Design and Control School of Chemical and Biological Engineering Monash University Clayton VIC 3800 Australia MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Zhejiang University 38 Zheda Road Hangzhou 310027 China

Highly oriented carbon fiber composites exhibit three-dimensional anisotropic thermophysical properties, making them candidates for thermal management applications. In this study, the thermal properties of highly oriented carbon fiber/epoxy resin (CF/ER) composites and their components were systematically investigated. The T-type probe method was employed to measure the pitch CF, while the 2ω method and the laser-spot-periodic-heating method were combined to characterize the E51-ER film and the composites. The impact of local fiber bending on heat transfer in the composites was also analyzed through finite element simulations. The results show that these composites exhibit high thermal conductivity along the fiber orientation with an anisotropy ratio of about 294. At different temperatures, the thermal conductivity along the fiber orientation is lower than the value predicted by the parallel model, while the conductivity in the other two directions is significantly higher than that predicted by the series model. Simulation results suggest that the bending of certain pitch CF can be a key factor contributing to this discrepancy.

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