Powder Technology最新文献

{"title":"Simulation method of the functional density cellular automaton for non-uniform flow in bubbling fluidized beds","authors":"He Kun ,&nbsp;Zheng Zhong","doi":"10.1016/j.powtec.2025.121479","DOIUrl":"10.1016/j.powtec.2025.121479","url":null,"abstract":"<div><div>This paper presents a functional density cellular automaton model that conveniently expresses the clustering effect between gas and solid phases. The study simulates the settlement process of single particles and validates the correctness and effectiveness of the functional density approach for gas-solid interactions by comparing with findings in existing literature. The model also investigates the fluidization states of solid particles under varying gas and solid densities. Results indicate that solid particles experience fluctuating resultant forces due to the combined effects of gravity and drag. The magnitude of resultant force increases with solid density, while initially decreasing and then increasing with gas density. When solid particles rise within the fluidized system, their force fluctuations diminish overall. The new model offers unique advantages in characterizing the microscopic behavior of gas-solid interactions in fluidized systems, providing new insights into fluidization mechanisms.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"466 ","pages":"Article 121479"},"PeriodicalIF":4.6,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144739347","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}

{"title":"A novel ballast roughness index for characterizing the surface undulation anisotropy and its application in directional friction of replicated ballast surfaces","authors":"Lihua Xue ,&nbsp;Junhua Xiao ,&nbsp;Jiapei Ma ,&nbsp;Kaichao Wang ,&nbsp;Yunbo Huo","doi":"10.1016/j.powtec.2025.121457","DOIUrl":"10.1016/j.powtec.2025.121457","url":null,"abstract":"<div><div>The friction coefficient of ballast particles is a critical parameter influencing the dynamic stability of ballasted beds. Currently, friction tests are commonly used to study ballast friction behavior. However, the anisotropy of surface roughness causes significant directional variations in friction coefficients. Conventional roughness indices fail to adequately capture these features, hindering quantitative correlations between friction coefficients and surface morphology. To address this issue, this study analyzed the statistical characteristics of surface roughness anisotropy from 584 real ballast particles. Based on the findings, a comprehensive roughness index was proposed, incorporating surface undulation amplitude, inclination and its anisotropy. The validity of the proposed index was confirmed through a comparison with conventional roughness indices. Then, the new roughness index was applied to ballast friction tests conducted along orthogonal directions. A linear correlation was identified between the index and the friction coefficients in the corresponding directions. In addition, the directional difference in friction was found to decrease with increasing normal load, indicating a reduced influence of roughness under higher stress conditions.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"466 ","pages":"Article 121457"},"PeriodicalIF":4.6,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144758068","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}

{"title":"Development of a high shear wet granulation regime map for the controlled agglomeration of heat sensitive amorphous food powders","authors":"Yashodh H. Karunanayake ,&nbsp;Linda Brütsch ,&nbsp;Vincent Meunier ,&nbsp;Gerhard Niederreiter ,&nbsp;Agba D. Salman","doi":"10.1016/j.powtec.2025.121470","DOIUrl":"10.1016/j.powtec.2025.121470","url":null,"abstract":"<div><div>If not controlled, temperature and humidity may induce caking of amorphous food powders that can be a major issue during food granulation. Caking must be avoided because it results in the permanent loss of material and process failure. The impact of key process parameters to achieve controlled particle agglomeration by avoiding caking in a High Shear Granulator was assessed across a range of Maltodextrins. Findings reveal that increasing impeller speed, batch size and run time promoted the rate of heat generation in the system. The resulting increase in bed temperature was found to impact the different Maltodextrin powders to varying extents depending on the powder T_g, with high DE Maltodextrins showing greater sensitivity to temperature increases. This study also highlighted that high DE Maltodextrins require less water for effective granulation. This behavior correlated with the rate at which the water binder's viscosity increases as it incorporates Maltodextrin during granulation. High DE Maltodextrins demonstrated slower viscosity rises with increased solid composition than low DE counterparts, producing binder systems that remains mobile and adhesive at higher solid contents, thereby facilitating more efficient granulation. A parameter <span><math><msub><mi>k</mi><mi>μ</mi></msub></math></span> was modelled to reflect this relationship. The parameters (T- T_g) and <span><math><mfenced><mrow><mi>L</mi><mo>/</mo><mi>S</mi></mrow></mfenced><mo>/</mo><msub><mi>k</mi><mi>μ</mi></msub></math></span> were then used to produce a caking regime map for the High Shear Granulation system. This regime map delineates an optimal region for controlled agglomeration and a region where a high likelihood of caking occurs. The threshold of this caking region was set at a T-Tg of 40 °C and <span><math><mfenced><mrow><mi>L</mi><mo>/</mo><mi>S</mi></mrow></mfenced><mo>/</mo><msub><mi>k</mi><mi>μ</mi></msub></math></span> value of 0.0325.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"466 ","pages":"Article 121470"},"PeriodicalIF":4.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144739351","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}

{"title":"Pressure-driven dynamic sintering mechanism and fracture failure mode in bimetallic surface coating composite interfacial nanoparticle","authors":"Weishan Lv ,&nbsp;Jianwei Lv ,&nbsp;Suhang Wei ,&nbsp;Jiaxin Liu ,&nbsp;Cai Chen ,&nbsp;Yong Kang","doi":"10.1016/j.powtec.2025.121476","DOIUrl":"10.1016/j.powtec.2025.121476","url":null,"abstract":"<div><div>Understanding the underlying sintering diffusion mechanism and mechanical failure modes of bimetallic surface coating nanoparticles under pressure-driven sintering can promote the synthesis and application of die-attach materials. In this paper, we innovatively proposed a continuous molecular dynamics (MD) method to reveal the fusion mechanism and surface mechanical response of Cu@Ag bimetallic surface coating composite nanoparticles under pressure-assisted sintering. The results indicate that the thickness of the coating and the sintering temperature have a synergistic regulatory effect on the sintering kinetics and structural evolution. There is a critical threshold for the thickness of the coating, which can significantly regulate the topological evolution of diffusion paths through the formation of stacking faults and dislocations. The sintering temperature affects the competitive mechanism between dislocation proliferation and slip by adjusting the diffusion activation energy. The triple coupling mechanism of “diffusion-interface-deformation” in bimetallic composite materials was first elucidated through uniaxial tensile simulation. Changing the thickness of coating can regulate the diffusion path and interface stress state, combined with the activation effect of sintering temperature on the deformation mechanism, jointly inducing the evolution of the material from brittle fracture to ductile fracture and then to adhesive fracture. This study provides new theoretical basis for design of coating nanoparticle materials, especially the discovery of critical thickness effects and coupling mechanisms, advancing high performance die-attach materials.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"466 ","pages":"Article 121476"},"PeriodicalIF":4.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724106","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}

{"title":"Eco-friendly composite dust suppressant based on Enteromorpha cellulose: Preparation, characterization and dust suppression mechanism","authors":"Jinfeng Wang ,&nbsp;Qimeng Zhao ,&nbsp;Zhixin Wei ,&nbsp;Xu Chen ,&nbsp;Jia Ding ,&nbsp;Wenbin Zhao","doi":"10.1016/j.powtec.2025.121477","DOIUrl":"10.1016/j.powtec.2025.121477","url":null,"abstract":"<div><div>In addressing the issue of excessive dust generation during coal mining and transportation, as well as the detrimental impact of Enteromorpha (EP) outbreaks on marine ecosystems, an eco-friendly composite dust suppressant (CPPS) has been developed. This suppressant is created through the carboxymethylation modification of EP cellulose, which serves as the matrix, and incorporates polyvinyl alcohol (PVA) and polyacrylamide (PAM) as monomers. Using consolidation strength as the performance metric, the optimal compounding conditions for the dust suppressant at 60 °C were established through orthogonal experiments. The ideal ratio of the components PVA, PAM, and SDBS was determined to be 10:1:4, resulting in a consolidation strength of 77.3 HA for the optimal formulation. Under a simulated wind speed of 12 m/s, the dust suppression rate of the formulated product remains above 95 %. Furthermore, the contact angle between CPPS and the coal cake is reduced by 34 % in comparison to traditional dust suppressants. After 9 h, the water retention of the coal sample treated with CPPS stabilizes at approximately 18 %. Simulations using Materials Studio software indicate that CPPS enhances the infiltration of water molecules into coal dust and improves the adhesion between water and coal dust. This research is significant for the advancement of environmentally friendly composite dust suppressants and supports sustainable environmental practices.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"466 ","pages":"Article 121477"},"PeriodicalIF":4.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721487","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}

{"title":"A novel technique for the preparation of iron carbide and titanium-rich material from vanadium‑titanium magnetite","authors":"Shaoqiang Liu,&nbsp;Dong Chen,&nbsp;Peng Li,&nbsp;Hongwei Guo,&nbsp;Wei Zhao,&nbsp;Yang Yang,&nbsp;Ao Xie","doi":"10.1016/j.powtec.2025.121469","DOIUrl":"10.1016/j.powtec.2025.121469","url":null,"abstract":"<div><div>Vanadium‑titanium magnetite (VTM) is a polymetallic iron ore that is typically difficult to process. In this study, a novel technology-based utilization of VTM as iron carbide concentrate and titanium-rich material by applying carburization roasting followed by magnetic separation is proposed. Under optimized conditions, an iron carbide concentrate assaying 86.43 % Fe and 5.23 % C with a corresponding iron recovery rate of 99.37 % and a titanium-rich material assaying 45.14 % TiO₂ with a corresponding titanium recovery rate of 79.97 % were prepared. Moreover, the carburization behavior and separation mechanism were revealed using X-ray diffractometer (XRD) and scanning electron microscope (SEM). The results show that the separation efficiency of iron carbide, titanium minerals and gangue was very low. The Na₂CO₃ additive and high temperature reduction treatment are effective measures to improve the separation efficiency as they can significantly increase the carburization efficiency, enlarge the iron carbide particle size, and improve the embedded relationship of gangue, titanium minerals and iron carbide. In addition, high temperature reduction treatment can enhance the reactions of Na₂CO₃ and titanium minerals. The study demonstrates that preparation of iron carbide and titanium-rich material from VTM using the proposed technology is a feasible method.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"466 ","pages":"Article 121469"},"PeriodicalIF":4.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144739349","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}

{"title":"Effect of node-strengthened shape on mechanical properties of body-centered-cubic lattice structures fabricated by selective laser melting","authors":"Xiaoqing Zhang ,&nbsp;Yuwei Zhang ,&nbsp;Lijing Xie ,&nbsp;Wentian Shi ,&nbsp;Bo Liu","doi":"10.1016/j.powtec.2025.121465","DOIUrl":"10.1016/j.powtec.2025.121465","url":null,"abstract":"<div><div>In response to the problem of stress concentration at the nodes of body-centered-cubic (BCC) lattice structures, three kinds of node-strengthened shapes are designed in this study. Ti-6Al-4 V and selective laser melting are used to prepare lattice structures with different strengthening degrees. Combined with quasi-static compression experiment and finite element analysis (FEA), the effects of rounded corner transition, solid ball reinforcement and truss element with variable cross-section characteristics on mechanical properties are investigated. The compressive properties, deformation behavior and stress distribution mechanism are studied and verified in this experiment. The results show that the enhancing effect of different node-strengthened modes is different. The truss element with variable cross-section characteristics shows the best ability to relieve stress concentration, and the equivalent elastic modulus and equivalent yield strength of BCC-V-3 structure are increased by 48.1 % and 19.6 %, respectively. By analyzing the mechanism of stress distribution, it is found that the node strengthening should focus on optimizing the concentration area of tensile stress which is easy to cause cracks, and the best strengthening degree of different node shapes is different, and the principle of obtaining a more uniform stress distribution should be taken as the criterion. In addition, the fracture gradually shifts to the middle of the strut with the increase of strengthening degree, and it is expected to realize the fracture mode of the lattice structures directionally designed.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"466 ","pages":"Article 121465"},"PeriodicalIF":4.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144767028","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}

{"title":"A novel liner plate model design for vertical shaft impact crusher and evaluation by DEM simulation","authors":"Li Li,&nbsp;Yanjun Wang,&nbsp;Xiaoliang Luo,&nbsp;Wei Guan","doi":"10.1016/j.powtec.2025.121471","DOIUrl":"10.1016/j.powtec.2025.121471","url":null,"abstract":"<div><div>As a construction machinery, vertical shaft impact crushers have been widely used in house buildings, highways and other large-scale projects because of its efficient aggregate production capacity. In order to enhance the mineral processing performance of vertical shaft impact crushers, a novel liner structure derived from both physical and mathematical models is introduced. Comparative testing of this new liner is conducted in a virtual environment using the Discrete Element Method (DEM). Virtual prototype experiments demonstrate the high accuracy of the particle motion model and the liner mathematical model, ensuring precise vertical impact between material particles and the liner with reduced impact angle errors. The data from the DEM simulations reveal that the novel liner configuration achieves an optimal impact angle between the particles and the liner surface, thereby reducing the incidence of impact angle errors. When outfitted with this novel liner, the VSI demonstrated a 41 % increase in generated impact energy within the crushing chamber, leading to improved reduction of maximum material size and a more desirable particle size distribution. Furthermore, the novel liner design contributed to a reduction in the number of recycling crushing cycles necessary, especially under choke feeding conditions.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"466 ","pages":"Article 121471"},"PeriodicalIF":4.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144739350","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}

{"title":"Machine learning and numerical simulation research on key parameters of batch stirred tank: influence of operating parameters","authors":"Zhengquan Li ,&nbsp;Boqun Zhang ,&nbsp;Huimin Chen ,&nbsp;Yide Wang ,&nbsp;Qiang Zhou ,&nbsp;Zongyan Zhou","doi":"10.1016/j.powtec.2025.121466","DOIUrl":"10.1016/j.powtec.2025.121466","url":null,"abstract":"<div><div>Utilizing a developed Computational Fluid Dynamics-Artificial Neural Network (CFD-ANN) model and Multi-Objective Optimization-Multi-Criteria Decision-Making (MOO-MCDM) method, the effects of operating parameters on the energy efficiency of the stirring process in a batch stirred tank were investigated. Key operating parameters examined include rotation speed (<em>N</em>), fill level (<em>φ</em>), and solid content (<em>ω</em>). The performance objectives were power consumption (<em>P</em>), flow number (<em>N</em>_Q), and standard deviation of solid concentration (<em>σ</em>). Results revealed strong correlations (<em>R</em>² &gt; 0.98) between these three factors and <em>P</em>, <em>N</em>_Q and <em>σ</em>. Multi-Criteria Decision-Making on the Pareto frontier yielded a weighted optimal solution. Compared to base case 1, an increase in flow number by 16.7883 %, reduced the standard deviation of solid concentration by 67.7730 %, and significantly improved tank stirring efficiency. Relative to base case 2, power consumption is reduced by 91.6737 %, significantly lowering energy usage. Against to base case 3, power consumption is reduced by 63.4930 %, the flow number increases by 16.7883 %, and the standard deviation of solid concentration is 0.0808. The optimization results indicate that significant energy savings can be achieved while maintaining uniform material mixing.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"466 ","pages":"Article 121466"},"PeriodicalIF":4.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144723992","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}

{"title":"Modeling and simulation of impact and breakage of maize kernels based on the DEM-PBM","authors":"Yajun Yu,&nbsp;Ning Wang,&nbsp;Yinghui Wang,&nbsp;Jianqun Yu,&nbsp;Jinwen Zhao,&nbsp;Yongchang Sun,&nbsp;Huiyan Zhao,&nbsp;Kai Sun","doi":"10.1016/j.powtec.2025.121456","DOIUrl":"10.1016/j.powtec.2025.121456","url":null,"abstract":"<div><div>Maize kernel impact damage is a common phenomenon during mechanical corn harvesting and significantly affects harvest quality. Therefore, in this study, the discrete element method (DEM) was employed to investigate the fracture mechanism of maize kernels while considering different moisture contents and impact postures. Firstly, a breakable maize kernel model was constructed based on the parallel bonding model (PBM). The calibration method including single-factor experiment, Plackett-Burman experiment, steepest ascent experiment and Box-Behnken experiment was employed to establish the calibration approach for bonding parameters of the maize model at different moisture contents. The calibrated model was evaluated through kernel compression tests, yielding relative errors of 2.13 %, 1.34 %, and 1.92 % for the simulated peak forces. Subsequently, impact tests and simulations were employed to analyze the fracture characteristics of maize kernels under different impact velocities and postures. The results showed that the impact posture significantly influenced the transition threshold between fracture modes: kernels in the bottom posture (BP) were the most prone to breakage, while those in the front posture (FP) demonstrated the highest impact resistance, and increasing moisture content significantly improved impact resistance. A phase diagram of moisture content, impact velocity, and fracture mode was established, and the critical transition equations for different moisture contents and impact postures were derived. Furthermore, by analyzing crack propagation angles and the time-history curves of bonding force, a mathematical relationship was established between crack angle, impact velocity, and bonding force fluctuation amplitude. This revealed the physical mechanism underlying the slowed increase in damage ratio at high impact velocities: the formation of microcrack networks induces stress shielding, thereby reducing energy transfer efficiency. The findings provide a theoretical basis and data reference for the optimized design of maize harvesting machinery.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"466 ","pages":"Article 121456"},"PeriodicalIF":4.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144767032","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}