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

Chemical Engineering Science 2025年 316卷

作者： He, Jielong Wang, Yuelei Yang, Liuyimei Xu, Jin Zheng, Qijun Liu, Sida Zhou, Zongyan 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 Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China Centre for Simulation and Modelling of Particulate Systems Monash-Southeast University Joint Research Institute Suzhou215123 China ARC Research Hub for Smart Process Design and Control Department of Chemical and Biological Engineering Monash University MelbourneVIC3800 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. © 2025 Elsevier Ltd

关键词： Binary mixtures

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Research on Durability of Recycled Ceramic Powder Concrete

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IOP Conference Series: Materials Science and Engineering 2017年第1期216卷

作者： M C Chen W Fang K C Xu L Xie Jiangxi Provincial Key Laboratory of Simulation and Control of Building Process School of Civil Engineering and Architecture East China Jiaotong University Nanchang 330013 China

Ceramic was ground into powder with 325 mesh and used to prepare for concrete. Basic mechanical properties, carbonation and chloride ion penetration of the concrete tests were conducted. In addition, 6-hour electric fluxes of recycled ceramic powder concrete were measured under loading. The results showed that the age strength of ceramics powder concrete is higher than that of the ordinary concrete and the fly ash concrete. The ceramic powder used as admixture would reduce the strength of concrete under no consideration of its impact factor; under consideration of the impact factor for ceramic powder as admixture, the carbonation resistance of ceramic powder concrete was significantly improved, and the 28 day carbonation depth of the ceramic powder concrete was only 31.5% of ordinary concrete. The anti-chloride-permeability of recycled ceramic powder concrete was excellent.

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simulation of Corrosion process for Structure with the Cellular Automata Method

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IOP Conference Series: Materials Science and Engineering 2017年第1期216卷

作者： M C Chen Q Q Wen School of Civil Engineering and Architecture East China Jiaotong University Nanchang 330013 China Jiangxi Provincial Key Laboratory of Simulation and Control of Building Process

In this paper, from the mesoscopic point of view, under the assumption of metal corrosion damage evolution being a diffusive process, the cellular automata (CA) method was proposed to simulate numerically the uniform corrosion damage evolution of outer steel tube of concrete filled steel tubular columns subjected to corrosive environment, and the effects of corrosive agent concentration, dissolution probability and elapsed etching time on the corrosion damage evolution were also investigated. It was shown that corrosion damage increases nonlinearly with increasing elapsed etching time, and the longer the etching time, the more serious the corrosion damage; different concentration of corrosive agents had different impacts on the corrosion damage degree of the outer steel tube, but the difference between the impacts was very small; the heavier the concentration, the more serious the influence. The greater the dissolution probability, the more serious the corrosion damage of the outer steel tube, but with the increase of dissolution probability, the difference between its impacts on the corrosion damage became smaller and smaller. To validate present method, corrosion damage measurements for concrete filled square steel tubular columns (CFSSTCs) sealed at both their ends and immersed fully in a simulating acid rain solution were conducted, and Faraday's law was used to predict their theoretical values. Meanwhile, the proposed CA mode was applied for the simulation of corrosion damage evolution of the CFSSTCs. It was shown by the comparisons of results from the three methods aforementioned that they were in good agreement, implying that the proposed method used for the simulation of corrosion damage evolution of concrete filled steel tubular columns is feasible and effective. It will open a new approach to study and evaluate further the corrosion damage, loading capacity and lifetime prediction of concrete filled steel tubular structures.

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FP-On An Improvement in the Bonding Properties of Recycled Coarse Ceramic Aggregate Concrete

FP-On An Improvement in the Bonding Properties of Recycled C...

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The 14th International Congress on the Chemistry of Cement（ICCC 2015）

作者： Meng-Cheng CHEN Wei Fang Kai-Cheng Xu Jiangxi Provincial Key Laboratory of Simulation and Control of Building Process School of Civil Engineering and ArchitectureEast China Jiaotong University

In this paper the issues how to enhance the rupture strength of recycled coarse ceramic aggregate concrete were discussed.24 specimens of 40 mm × 40 mm × 160 mm casted with soaked coarse ceramic aggregates and cement motar were used to examine experimentally the effect of silane coupling agent solution concentration and immersion time on the rupture strength of interfacial transition zone(ITZ) between recycled coarse ceramic aggregate and cement *** experiment results showed that the bonding performance for the ITZ in the recycled coarse ceramic aggregate concrete could be greatly improved by immersing the coarse ceramic aggregates in some diluted adhesion agent and was confirmed by the stereomicroscope analysis;the rupture strength increased with increasing the immersion time,and first increased but then decreased with the increase of silane coupling agent solution concentration;the compressive strength after 28-day curing increased by 38.4% by using 15% replacement of coarse rubble aggregates by the present soaked coarse ceramic aggregates;even for 100% replacement of coarse rubble aggregates by the present ceramic aggregates,the compressive strength of the recycled ceramic aggregate concrete is still higher man that of natural rubble aggregate concrete;when the replacement of coarse aggregates reaches 60%,elasticity modulus of the present recycled concrete is still improved by 3.2% compared to that of natural rubble aggregate *** Very few studies on the improvement of bonding performances of the ITZ of recycled coarse ceramic concrete were carried *** paper deals with discussions on how to enhance the bonding properties of recycled coarse ceramic *** experiment results showed that the bonding performance for the ITZ in the recycled coarse ceramic aggregate concrete could be greatly improved by immersing coarse ceramic aggregates in some diluted adhesion agent such as silane coupling *** micro-mechanism of the IZT was

关键词： Recycled coarse ceramic aggregate concrete bonding performance mechanical property adhesion agent.

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