Powder Technology最新文献_第2页

Characteristics of powder charging behavior via forced triboelectric charging on an inclined chute 倾斜溜槽上通过强制三电装料进行粉末装料的行为特征

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-08 DOI: 10.1016/j.powtec.2024.120400

Mehran Javadi, Mohamed Abohelwa, Annett Wollmann, Alfred P. Weber

{"title":"Characteristics of powder charging behavior via forced triboelectric charging on an inclined chute","authors":"Mehran Javadi, Mohamed Abohelwa, Annett Wollmann, Alfred P. Weber","doi":"10.1016/j.powtec.2024.120400","DOIUrl":"10.1016/j.powtec.2024.120400","url":null,"abstract":"<div><div>This study presents a novel method for selective charging of powders by dry triboelectric forced charging utilized as the first stage of material sorting in an electric field. In forced triboelectric charging, a high voltage is applied to the copper chute in which particles are charged during their transportation. In this research, the effect of the operating parameters of the chute, including mass flow rate, angle of inclination, and length, on the specific particle charge of limestone powders was investigated. In addition, the behavior of the charged particles in an electrostatic sorter was analyzed by evaluating their charge distribution after sorting. The results reveal that as the length of the chute increases, the specific charge asymptotically approaches a saturation value, which is determined by the high voltage applied. Furthermore, for a given chute length, the high voltage influences the amount and the sign of the specific particle charge, including a high voltage value at which the particles are neutral on average, i.e., the so-called point of zero net charge (PZNC). This PZNC is of particular interest for sorting out a target component from a powder mixture. However, if the mass flow rate is increased above a certain value, the specific charge decreases as the number of particle wall contacts is reduced due to stratification. Bipolar charge distributions were observed for all investigated high voltages, with the distribution width increasing with particle size to the power of 2.1. The modal value of the charge distribution shifts according to the difference in voltage applied to the PZNC.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120400"},"PeriodicalIF":4.5,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on the design load of the flights of a rotary kiln based on thermal granular flow coupling 基于热颗粒流耦合的回转窑窑尾设计负荷研究

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-07 DOI: 10.1016/j.powtec.2024.120430

Yuan Chen , Zhongliang Gong , Jiantao Yu , Yuhui Li , Lincheng Luo , Dan Huang

{"title":"Research on the design load of the flights of a rotary kiln based on thermal granular flow coupling","authors":"Yuan Chen , Zhongliang Gong , Jiantao Yu , Yuhui Li , Lincheng Luo , Dan Huang","doi":"10.1016/j.powtec.2024.120430","DOIUrl":"10.1016/j.powtec.2024.120430","url":null,"abstract":"<div><div>The rotary kilns are widely used in chemical, food and metallurgical industries, and the design load of the internal flights has a significant effect on the drying efficiency of the rotary kilns. The motion of granular flow and heat absorption process inside the rotary kilns were simulated by establishing a coupled CFD and DEM model. The average heat absorption rate of granules was proposed to simulate the “L” type and three segments flights, and the results showed that the average heat absorption rate of granules was in accordance with the conclusions of previous scholars. We used the average heat absorption method of granules to optimize the structural parameters of the “J” type flights design load, the best parameter was obtained, and then compared with the “L” type and three segments of the flights, we found that the drying efficiency of “J” type flights is the best, followed by three segments and “L” type is found to be the worst. At the same time, the active region was divided to explore the relationship between the area occupied by the granules in different regions and the average heat absorption rate of granules, and it was found that under the same shape of the flights, the larger the area occupied by the granules in region 2, the larger the corresponding average heat absorption rate of granules.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120430"},"PeriodicalIF":4.5,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel mesh algorithm to improve the packing efficiency of irregular-shaped particles in simulating cement paste's microstructure 在模拟水泥浆微观结构时提高不规则形状颗粒堆积效率的新型网格算法

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-07 DOI: 10.1016/j.powtec.2024.120415

Peng Gao , Hongjie Liu , Jingzhe Li , Yang Yu , Faquan Xie , Haijun Lu , Yanbo Hu , Yonggan Yang , Binggen Zhan , Qijun Yu

{"title":"A novel mesh algorithm to improve the packing efficiency of irregular-shaped particles in simulating cement paste's microstructure","authors":"Peng Gao , Hongjie Liu , Jingzhe Li , Yang Yu , Faquan Xie , Haijun Lu , Yanbo Hu , Yonggan Yang , Binggen Zhan , Qijun Yu","doi":"10.1016/j.powtec.2024.120415","DOIUrl":"10.1016/j.powtec.2024.120415","url":null,"abstract":"<div><div>Irregular-shaped particle packing is important to simulate the cement paste microstructure. However, the efficiency of current packing models is relatively low. This study proposes a novel packing algorithm named the Mesh Optimization Packing (MOP) model inspired by the VOX and extent overlap box (EOB) methods. The MOP model's performance in terms of accuracy, uniformity, and randomness were evaluated. Meanwhile, compared to the Anm model 2.0 and the VOX model, the MOP model excels in simulating the initial microstructure of cement paste with high cement volume fractions. When the cement volume fraction is 56.03 %, the VOX model requires 124.68 h, while the MOP model only takes 18.80 h. By adding uniform-thickness shells to irregular-shaped particles, the MOP model integrates with the HYMOSTRUC3D-E model to simulate the evolution and uniaxial stretching process of the cement paste microstructure. This innovative modelling approach offers a promising solution for future simulations of cement paste microstructure.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120415"},"PeriodicalIF":4.5,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation into particle flow patterns during powder spreading in SLM process 研究 SLM 工艺中粉末铺展过程中的颗粒流动模式

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-07 DOI: 10.1016/j.powtec.2024.120429

Qipeng Liu , Qiuqiang Zhou , Yuehua Gao , Zheng Liu , Xihua Chu , Zhao Zhang , Yuhua Chen

引用次数: 0

Design and optimization of stirrer and mixer design for the correct mixing of pharmaceutical powders through DEM 通过 DEM 设计和优化搅拌器和混合器设计，以正确混合药粉

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-07 DOI: 10.1016/j.powtec.2024.120413

Nizar Salloum , Thomas Brinz , Aitor Atxutegi , Stefan Heinrich

引用次数: 0

Impact of grinding media shape on the dissociation characteristics and flotation behavior of coking coal middlings 磨矿介质形状对焦煤煤泥解离特性和浮选行为的影响

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-06 DOI: 10.1016/j.powtec.2024.120423

Keqi Guo , Deke Zhang , Wang Guo , Yonggai Li , Yaowen Xing , Xiahui Gui

{"title":"Impact of grinding media shape on the dissociation characteristics and flotation behavior of coking coal middlings","authors":"Keqi Guo , Deke Zhang , Wang Guo , Yonggai Li , Yaowen Xing , Xiahui Gui","doi":"10.1016/j.powtec.2024.120423","DOIUrl":"10.1016/j.powtec.2024.120423","url":null,"abstract":"<div><div>The effective dissociation of feed materials has a major impact on the mineral flotation recovery performance in the mineral processing field. Coking coal middlings is difficult to be effectively dissociated due to its complex internal gangue distribution characteristics. The aim of this paper is to compare and evaluate the performance of ball versus hexagonal prism media for the coking coal middlings comminution by point contact and line-surface contact. The results of the grinding tests show that hexagonal prism could result in a more uniform coal particle size distribution, less over-grinding and better selective dissociation effect comparing with ball. The results of the particle shape coefficient indicate the hexagonal prism milled product has a sphericity (<em>R</em><sub><em>s</em></sub>) of 0.90 and an elongation (<em>E</em><sub><em>W</em></sub>) of 1.69, which is more slender than the ball milled product (<em>Rs</em> = 0.94, <em>E</em><sub><em>W</em></sub> = 1.47). Flotation tests showed that the hexagonal prism milled product was more hydrophobic with a wrap angle of 185° compared to the ball milled product at 121°. Meanwhile, the TSI value of the hexagonal prism milled product is 80.500, which is lower than the 82.608 TSI value of the ball milled product, indicating that the flotation system of the hexagonal prism mill product is more stable. Under the same flotation test conditions, the combustible matter recovery rate of the hexagonal prism milled product was 5.08 % higher than that of the ball milled product.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120423"},"PeriodicalIF":4.5,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of abrasive volume fraction on energy utilization in suspension abrasive water jets based on VOF-DEM method 基于 VOF-DEM 方法的磨料体积分数对悬浮磨料水射流能量利用率的影响

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-06 DOI: 10.1016/j.powtec.2024.120427

Changjiang Chen , Jianping Wei , Tiegang Zhang , Huidong Zhang , Yong Liu

{"title":"Effect of abrasive volume fraction on energy utilization in suspension abrasive water jets based on VOF-DEM method","authors":"Changjiang Chen , Jianping Wei , Tiegang Zhang , Huidong Zhang , Yong Liu","doi":"10.1016/j.powtec.2024.120427","DOIUrl":"10.1016/j.powtec.2024.120427","url":null,"abstract":"<div><div>Suspension abrasive water jets (AWJs) rock breaking is the kinetic energy of abrasive particle group transport and transfer. However, it is difficult to be popularized and utilized due to the high energy consumption of rock breaking. In this study, the energy transfer rate in AWJs was focused on and was investigated using numerical and experimental methods. A two-way coupled algorithm was used to reproduce the oscillation characteristics of abrasive jets velocities, indicating that not only the abrasives' velocities but also the abrasives' distribution is crucial in energy transfer rate. Different dominant factors accounting for the abrasives' velocities and distribution were identified, and two parameters were proposed to account for the energy transfer process during the jet evolution process. The optimum abrasives' volume fraction was determined based on the evolution of the energy density and ratio of abrasive kinetic energy to the total energy, which was validated by rock breaking experiments. Increasing ratio of abrasive kinetic energy to the total energy by using the method of changing the volume fraction of the abrasive is an effective method to improve the rock breaking efficiency of suspension abrasive water jets.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120427"},"PeriodicalIF":4.5,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Insights into gas-solid flow structures in fluidized beds up to 1600 °C via analysis of gas residence time distributions 通过分析气体停留时间分布深入了解温度高达 1600 °C 的流化床中的气固流动结构

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-06 DOI: 10.1016/j.powtec.2024.120426

Han Gao , Zeshi Chen , Qingjin Zhang , Liangliang Fu , Guangwen Xu , Dingrong Bai

引用次数: 0

GPU based discrete element modeling for convex polyhedral shape particles: Development and validation 基于 GPU 的凸多面体形状粒子离散元素建模：开发与验证

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-05 DOI: 10.1016/j.powtec.2024.120407

Aman Mittal , Narasimha Mangadoddy , Raja Banerjee

{"title":"GPU based discrete element modeling for convex polyhedral shape particles: Development and validation","authors":"Aman Mittal , Narasimha Mangadoddy , Raja Banerjee","doi":"10.1016/j.powtec.2024.120407","DOIUrl":"10.1016/j.powtec.2024.120407","url":null,"abstract":"<div><div>Particle dynamics simulations face a significant challenge in understanding the intricate behaviors of convex polyhedral particles due to their complex geometries and interactions. DEM emerges as a key method, illuminating the concealed intricacies of these geometric entities. Traditional algorithms often require cumbersome processes to check each type of contact individually. However, Gilbert–Johnson–Keerthi’s (GJK) and the expanding polytope algorithm (EPA) provide efficient numerical solutions for polyhedral contact detection and contact resolution. These Minkowski difference-based methods streamline contact detection and overlap computation, paving the way for deeper exploration of three-dimensional contact theory within DEM simulations. By leveraging GPU computational power, this paper outlines key algorithmic steps and verifies the solver’s accuracy through comparison with simulated and experimental data, with an average deviation of less than 5%. This study explores the impact of particle shape on the dynamics and mechanical behavior of densely packed systems, particularly in hoppers and tumblers. Spherical particles discharge faster but mix more slowly than polyhedral shapes, with icosahedrons achieving quicker full mixing. These results align with experimental findings, further validating the simulation approach.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120407"},"PeriodicalIF":4.5,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on adhesion properties of tidal flat soil on metal surface and discrete element simulation 潮汐平地土壤在金属表面的附着特性研究与离散元模拟

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-05 DOI: 10.1016/j.powtec.2024.120410

Xifeng Liang , Ze Hu , Yongwei Wang

{"title":"Research on adhesion properties of tidal flat soil on metal surface and discrete element simulation","authors":"Xifeng Liang , Ze Hu , Yongwei Wang","doi":"10.1016/j.powtec.2024.120410","DOIUrl":"10.1016/j.powtec.2024.120410","url":null,"abstract":"<div><div>The adhesion property of soil on the metal surface was tested by the orthogonal experiment with 4 factors and 3 levels based on piston pull out method. A regression model of adhesion stress and the factors including moisture content(<span><math><msub><mrow><mi>X</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span>), pressing time(<span><math><msub><mrow><mi>X</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>), settling time(<span><math><msub><mrow><mi>X</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span>) and separation velocity (<span><math><msub><mrow><mi>X</mi></mrow><mrow><mn>4</mn></mrow></msub></math></span>) was established. The experiment results show that the influence of each factor on adhesion stress is ranked as <span><math><mrow><msub><mrow><mi>X</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>≈</mo><msub><mrow><mi>X</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>≈</mo><msub><mrow><mi>X</mi></mrow><mrow><mn>3</mn></mrow></msub><mo>></mo><msub><mrow><mi>X</mi></mrow><mrow><mn>4</mn></mrow></msub><mo>></mo><msub><mrow><mi>X</mi></mrow><mrow><mn>3</mn></mrow></msub><msub><mrow><mi>X</mi></mrow><mrow><mn>4</mn></mrow></msub></mrow></math></span>, and the adhesion stress shows an ‘S’ curve with the increase of separation velocity. The DEM parameters of the soil were calibrated based on the test results, and the contact and disturbance state of soil particles during the test were studied by discrete element method (DEM) using JKR model. The simulation tests show that the maximum adhesion stress occurs when the particles are about to separate from the probe surface, and the soil disturbance state is hierarchical.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120410"},"PeriodicalIF":4.5,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0