Powder Technology最新文献_第6页

DDPM investigation on centrifugal slurry pump with inlet and sideline configuration retrofit 带入口和侧线配置改造的离心渣浆泵的 DDPM 调查

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-19 DOI: 10.1016/j.powtec.2024.120386

Haoyu Wang , Zhen Tan , Shibo Kuang , Aibing Yu

引用次数: 0

The study of the calculation method of the triboelectric rate of particles and surface materials at different collision velocities 不同碰撞速度下颗粒和表面材料的三电率计算方法研究

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-19 DOI: 10.1016/j.powtec.2024.120378

Shuai Zhou, Xiaofeng Hu, Shanghe Liu, Dong Chen, Yingying Wang, Lei Wang

引用次数: 0

Polycarbonate resin powder production via steam precipitation process: Experiment and CFD simulation 通过蒸汽沉淀工艺生产聚碳酸酯树脂粉末：实验和 CFD 模拟

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-18 DOI: 10.1016/j.powtec.2024.120373

Pan Xu , Jijun Ge , Jianyong Mao , Rongshan Bi

{"title":"Polycarbonate resin powder production via steam precipitation process: Experiment and CFD simulation","authors":"Pan Xu , Jijun Ge , Jianyong Mao , Rongshan Bi","doi":"10.1016/j.powtec.2024.120373","DOIUrl":"10.1016/j.powtec.2024.120373","url":null,"abstract":"<div><div>Polycarbonate (PC) is a widely used thermoplastic material with excellent transparency and physical toughness. Steam precipitation is a common method for converting PC in dichloromethane (DCM) solution into PC powder. To solve the problem of uneven droplet size and distribution in the steam precipitation atomization process, this paper constructs a simulation model of the atomization process of a steam precipitation jet, combines CFD theoretical analysis and experimental numerical analysis, and investigates the effects of ejector structure and operating conditions on the droplet size and distribution, including the diameter (D) of the feed hole, the steam flow rate, and the feed pressure. The results show that when the steam flow rate is at a high position, the average size of droplets is the smallest, and the number of droplets with a diameter less than 0.07 mm is the largest, accounting for about 57 % of the total number of droplets. Under the liquid flow rate kept constant, the smaller nozzle diameter of the ejector leads to smaller droplet size and wilder distribution. The number of droplets whose diameter is less than 0.07 mm accounts for almost about 50 %，70 %, and 80 % of the total when the nozzle diameter is 3.30 mm, 2.50 mm, and 2.0 mm, respectively. it is recommended to use D = 2.50 mm to improve the atomization dispersion effect, reduce energy consumption, and obtain a larger average particle size and a smaller distribution coefficient, which can avoid the accumulation of PC particles and thermal change caused by the presence of the retention zone and improve the efficiency of the atomization process. This study further optimizes the process conditions of the steam precipitation process, provides an essential reference for the improvement of the ejector, improves the efficiency and product quality of the PC powder production process, and promotes the promotion and development of the technology in the practical application of PC.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120373"},"PeriodicalIF":4.5,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526356","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

The influencing factors and mechanisms of granular flow dynamics 颗粒流动动力学的影响因素和机制

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-18 DOI: 10.1016/j.powtec.2024.120376

Kaleem Ullah Jan Khan, Wen-Jie Xu

{"title":"The influencing factors and mechanisms of granular flow dynamics","authors":"Kaleem Ullah Jan Khan, Wen-Jie Xu","doi":"10.1016/j.powtec.2024.120376","DOIUrl":"10.1016/j.powtec.2024.120376","url":null,"abstract":"<div><div>This study proposes an approach that combines experimental and numerical simulations to comprehensively elucidate the factors influencing the physical behaviour of granular flows. The rotating drum experiments are used to investigate the behaviour of mono-sized and poly-sized particle systems under increasing rotational speed of the drum. The experimental data is then integrated with GPU-based DEM simulations. This allows for the inverse calibration of key parameters like dynamic friction and damping ratios. These calibrated parameters are subsequently utilized throughout the study to explore the influence of various factors on granular flow dynamics. The increase in RPM leads to a rise in particle dispersion due to the interplay between centrifugal forces and particle collisions. The higher dynamic friction angles result in a steeper angle of repose and consequently shorter and longer runout distances for both mono-sized and poly-sized particles respectively. Conversely, increasing damping ratios lead to a decrease in the angle of repose and promote a well-organised flow patterns with increased frictional resistance, suggesting a significant impact on overall flow dynamics. The study paves the way for new insights into the behaviour of complex particulate systems, potentially benefiting various fields concerned with granular flow phenomena.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120376"},"PeriodicalIF":4.5,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526331","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 new method for determining activation energy in spark plasma sintering 确定火花等离子烧结活化能的新方法

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-18 DOI: 10.1016/j.powtec.2024.120367

Z. Liu , T. Chen , Y. Yang , T. Song , W.S. Cai , H.B. Ke , W.H. Wang , C. Yang

引用次数: 0

Numerical investigation and correlation development for pressure drop in pneumatic conveying through blinded T-bends 通过盲 T 形弯管进行气力输送时压力降的数值研究和相关性开发

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-18 DOI: 10.1016/j.powtec.2024.120375

Fatemeh Rashidi Gugheri, Hossein Ali Pakravan

引用次数: 0

Effect of low volume fraction of H2 on explosion characteristics and mechanism of AlH3 dust via connected container 低体积分数 H2 对通过连接容器的 AlH3 粉尘爆炸特性和机理的影响

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-18 DOI: 10.1016/j.powtec.2024.120372

Hao Wang , Xinfeng Li , Chuanbiao Zhang , Jiani Xie , Xin Zhang , Yanwu Yu , Xueqiang Shi , Fengyuan Jiao , Sen Xu , Weiguo Cao

{"title":"Effect of low volume fraction of H2 on explosion characteristics and mechanism of AlH3 dust via connected container","authors":"Hao Wang , Xinfeng Li , Chuanbiao Zhang , Jiani Xie , Xin Zhang , Yanwu Yu , Xueqiang Shi , Fengyuan Jiao , Sen Xu , Weiguo Cao","doi":"10.1016/j.powtec.2024.120372","DOIUrl":"10.1016/j.powtec.2024.120372","url":null,"abstract":"<div><div>During the storage and use of AlH<sub>3</sub>, a small amount of H<sub>2</sub> is easily decomposed, forming a multiphase composite system that increases explosive hazard. This article discussed the AlH<sub>3</sub> dust inducing low concentration H<sub>2</sub> explosion and venting characteristics by a connected vessel. The results show that when the concentration of H<sub>2</sub> was 1 % and 3 %, which was lower than the lower explosive limit of H<sub>2</sub> (4 %), H<sub>2</sub> was non-flammable, and the explosion was dust-driven explosion. At H<sub>2</sub> volume fraction of 5 %, a dual-fuel-driven explosion dominated, culminating in the maximum explosion pressure, reduced pressure, venting flame length, and velocity. The microscopic reaction mechanism of AlH<sub>3</sub> with H<sub>2</sub> was explored using molecular dynamics simulations. Meanwhile, for the security strategy of AlH<sub>3</sub> dust explosion venting with low H<sub>2</sub> atmosphere, the NFPA 68 and EN 14491 standards predicted the venting flame length effectively, offering critical insights for the application and safety design of AlH<sub>3</sub>.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120372"},"PeriodicalIF":4.5,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526466","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

Numerical simulation of multiphase flow induced by bottom blowing limestone powder in converter steelmaking 转炉炼钢中底吹石灰石粉引发的多相流数值模拟

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-17 DOI: 10.1016/j.powtec.2024.120369

Kaixuan Zhang , Shuhuan Wang , Chenxiao Li , Zhipeng Yuan , Yanchao Zhang

{"title":"Numerical simulation of multiphase flow induced by bottom blowing limestone powder in converter steelmaking","authors":"Kaixuan Zhang , Shuhuan Wang , Chenxiao Li , Zhipeng Yuan , Yanchao Zhang","doi":"10.1016/j.powtec.2024.120369","DOIUrl":"10.1016/j.powtec.2024.120369","url":null,"abstract":"<div><div>A full-scale three-dimensional model of a 120 t steel converter was established to evaluate the effects of bottom-blown limestone particle injection speed, diameter, and nozzle location on the particle distribution and molten metal flow field using numerical simulations. The results indicated that a particle injection speed of 6 m/s, particle diameter of 0.5 mm, and injection nozzle location at 1/2 of the converter bottom radius provided the longest particle residence time and largest quantity of particles in the molten metal. Furthermore, the use of these parameters produced within the molten metal an obvious particle concentration along the centerline of the converter, the fastest average liquid metal–particle flow velocity, and moderate splashing. These optimal injection parameters created favorable kinetic conditions for the dephosphorization reaction essential to steelmaking. This study provide a theoretical basis for realizing the improved efficiency associated with the use limestone instead of lime in practical steel production.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120369"},"PeriodicalIF":4.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526357","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

Particle aggregation and the grinding limit in high energy ball mill 高能球磨机中的颗粒聚集和研磨极限

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-16 DOI: 10.1016/j.powtec.2024.120370

Anna G. Matveeva , Tatiana S. Skripkina , Vyacheslav M. Nekrasov , Uliana E. Nikiforova , Vladimir A. Bukhtoyarov , Aleksey Bychkov , Igor Lomovskiy

{"title":"Particle aggregation and the grinding limit in high energy ball mill","authors":"Anna G. Matveeva , Tatiana S. Skripkina , Vyacheslav M. Nekrasov , Uliana E. Nikiforova , Vladimir A. Bukhtoyarov , Aleksey Bychkov , Igor Lomovskiy","doi":"10.1016/j.powtec.2024.120370","DOIUrl":"10.1016/j.powtec.2024.120370","url":null,"abstract":"<div><div>Dust aggregates — clusters of individual particles — are formed during mechanochemical processing of brown coal in a planetary ball mill. The aggregate structure can be identified by comparing the average sizes of aggregates and individual particles. We showed that dust aggregates are generally arranged in a regular way: the number of individual particles located along the aggregate coincides with the number of particles located across the aggregate. Power of power-law distribution of the monomers per aggregate revealed that individual particles stick together in extremely dense clusters. The average number of monomers per claster is ∼10<sup>4</sup>. In addition, it turned out that the dependence of the monomer's “stickiness” on applied energy dose has a kink simultaneously with other characteristics of the mechanochemical process (the monomer size and the chemical reaction depth). Speaking using mechanochemistry terms, it corresponds to transition from the brittle grinding mode to the plastic deformation mode after reaching the grinding limit.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120370"},"PeriodicalIF":4.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526352","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

Bed strength in sheared beds of mono- and bi-disperse particles: Dependence on geometrical and mechanical properties of constituent particles 单分散和双分散颗粒剪切床的床层强度：与组成颗粒的几何和机械特性有关

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-16 DOI: 10.1016/j.powtec.2024.120286

Feng Zhao , Yukie Tanino , Jianchun Guo , Rui He , Jichuan Ren , Ji Zeng , Weihua Chen , Liuke Huang

{"title":"Bed strength in sheared beds of mono- and bi-disperse particles: Dependence on geometrical and mechanical properties of constituent particles","authors":"Feng Zhao , Yukie Tanino , Jianchun Guo , Rui He , Jichuan Ren , Ji Zeng , Weihua Chen , Liuke Huang","doi":"10.1016/j.powtec.2024.120286","DOIUrl":"10.1016/j.powtec.2024.120286","url":null,"abstract":"<div><div>Temporary plugging zones are low-permeability fracture-scale plugs ‘assembled’ in situ by injecting polymer particles into petroleum reservoirs. We applied the rolling resistance linear model to simulate the shear strength of a rectangular packed bed, our model for a temporary plugging zone, comprising either uniform-sized particles or a binary mixture of larger bridging particles and smaller filling particles. Simulation results show that the strength of uniform beds increases with the size, the aspect ratio, the friction coefficient, and the Young’s modulus of the particles. The strength of binary packed beds first increased and then decreased as the fractional volume of the domain occupied by filling particles increased. Maximum strength was achieved when bridging particles have uniform Young’s modulus and aspect ratio but a range of friction coefficients, and their friction coefficient, Young’s modulus and aspect ratio are 21%, 17% and 18% larger than those of filling particles.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120286"},"PeriodicalIF":4.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526345","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