Powder Technology最新文献_第5页

Efficient and synergistic preparation of HNS-based energetic composite microspheres by the continuous drop-ball method and optimization of their multi-dimensional performance

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-16 DOI: 10.1016/j.powtec.2025.120814

Songchao Shi , Chenhe Feng , Wenqing Li , Lei Gao , Haoxing Cao , Baoyun Ye , Jingyu Wang , Chuanhao Xu , Chongwei An

{"title":"Efficient and synergistic preparation of HNS-based energetic composite microspheres by the continuous drop-ball method and optimization of their multi-dimensional performance","authors":"Songchao Shi , Chenhe Feng , Wenqing Li , Lei Gao , Haoxing Cao , Baoyun Ye , Jingyu Wang , Chuanhao Xu , Chongwei An","doi":"10.1016/j.powtec.2025.120814","DOIUrl":"10.1016/j.powtec.2025.120814","url":null,"abstract":"<div><div>This study presents an innovative continuous ball-dropping device combined with high-speed stirring and curing to successfully produce HNS-based energetic composite microspheres with uniform components and complete coatings. The effects of process parameters such as binder content, suspension concentration, continuous phase concentration, and stirring rate on the morphology and particle size distribution of the microspheres were systematically examined. The study further investigates the impact of the continuous ball-dropping method on fluidity, chemical structure, bulk density, thermal properties, mechanical sensitivity, and combustion properties of the microspheres. Results show that compared to Nano-HNS, the HNS-based microspheres prepared by the ball-dropping method exhibit improved fluidity (angle of repose: 37.97° vs 22.09°), higher bulk density (0.453 g·cm<sup>−3</sup> vs 0.552 g·cm<sup>−3</sup>), and increased activation energy. Mechanical sensitivity tests show a significant safety improvement, with critical impact energy increasing from 2.5 J to 40 J and friction sensitivity rising from 108 N to 180 N. The combustion performance of microspheres prepared by this method exhibits a larger flame area and shorter combustion time, thereby improving energy release efficiency. Compression performance improves as well, with microspheres exhibiting increased compression resistance, rising from 14.04 MPa to 37.02 MPa compared to traditional methods. In conclusion, the continuous drop ball method, combined with high-speed stirring and curing, efficiently produces fully coated energetic composite microspheres, offering a promising route for the large-scale industrial production of energetic materials.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120814"},"PeriodicalIF":4.5,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454487","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

Analysis of the screw feeding process in powder-based additive friction stir deposition

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-15 DOI: 10.1016/j.powtec.2025.120791

Wenguang Nan , Wenbin Xuan , Ziming He , Haimeng Hou , Zhonggang Sun , Wenya Li

{"title":"Analysis of the screw feeding process in powder-based additive friction stir deposition","authors":"Wenguang Nan , Wenbin Xuan , Ziming He , Haimeng Hou , Zhonggang Sun , Wenya Li","doi":"10.1016/j.powtec.2025.120791","DOIUrl":"10.1016/j.powtec.2025.120791","url":null,"abstract":"<div><div>The screw-feeding process in powder-based additive friction stir deposition (AFSD) is analysed in this work, in which the effect of feeding conditions on the choking/jamming problem and the feeding rate is explored through experiment and numerical simulation using Discrete Element Method (DEM). The results show that a narrow gap between the funnel outlet and the base is prone to particle jamming, which would entirely block the funnel outlet and produce a huge force on the screw. Jamming is more easily to occur when the rotational speed is relatively larger than the translational speed, and a mathematical model of the critical rotational speed above which the particle jamming and blockage would occur is proposed. Jamming is also sensitive to the design of the funnel outlet, in which a contracting outlet would make the choking and jamming problem more serious. For the feeding conditions without jamming, the feeding rate not only depends on the rotational speed of the screw but also is significantly affected by the translational speed. The feeding rate is linear to the rotational speed only when it is larger than a critical value, and this critical rotational speed increases with translational speed. The results also clarify that a good understanding of the screw-feeding process is essential for powder-based AFSD, in which an example of successful manufacturing of a 3D part is briefly illustrated in this work.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120791"},"PeriodicalIF":4.5,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446124","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

Surrogate model of DEM simulation for binary-sized particle mixing and segregation

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-15 DOI: 10.1016/j.powtec.2025.120811

Naoki Kishida, Hideya Nakamura, Shuji Ohsaki, Satoru Watano

{"title":"Surrogate model of DEM simulation for binary-sized particle mixing and segregation","authors":"Naoki Kishida, Hideya Nakamura, Shuji Ohsaki, Satoru Watano","doi":"10.1016/j.powtec.2025.120811","DOIUrl":"10.1016/j.powtec.2025.120811","url":null,"abstract":"<div><div>Segregation is a well-known phenomenon that occurs during powder mixing, wherein particles with similar properties are collected from specific regions of a bulk powder. Numerical simulation using the discrete element method (DEM) is recognized as a potent tool for investigating and predicting segregation. However, DEM simulations are computationally expensive. To address the high computational overhead, in our prior work, we proposed a machine-learning-based surrogate model for DEM simulation, namely, recurrent neural network with stochastically calculated random motion (RNNSR). The model was designed to predict the local mean component of the particle behavior using the Lagrangian approach and the local variability component of the particle behavior using the Eulerian approach. However, the RNNSR was demonstrated exclusively for monodisperse particles with homogeneous properties. Hence, in the current study, we extended the RNNSR to simulate the mixing and segregation of powders with inhomogeneous properties. The dependence of the particle size on the Lagrangian and Eulerian behaviors of the particles was investigated. Based on this analysis, an extended-RNNSR was developed for binary-sized particle system by adding the particle size data for the training data. The prediction accuracy of the extended-RNNSR was evaluated in terms of the mixing degree, particle velocity, granular temperature, and computing speed. It was demonstrated that the extended-RNNSR constructed on learning data initiated from the randomly mixed initial condition could predict mixing and segregation initiated from both segregated as well as the randomly mixed initial conditions. The extended-RNNSR also demonstrated a much faster computing speed than the DEM.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120811"},"PeriodicalIF":4.5,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438041","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 oxygen concentration on the minimum explosible concentration of aluminum powders

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-15 DOI: 10.1016/j.powtec.2025.120794

Wookyung Kim , Yasuko Ueno , Rinrin Saeki , Tomoyuki Johzaki , Takuma Endo , Minhyeok Lee , Kwangseok Choi , Kazunori Kuwana

{"title":"Effect of oxygen concentration on the minimum explosible concentration of aluminum powders","authors":"Wookyung Kim , Yasuko Ueno , Rinrin Saeki , Tomoyuki Johzaki , Takuma Endo , Minhyeok Lee , Kwangseok Choi , Kazunori Kuwana","doi":"10.1016/j.powtec.2025.120794","DOIUrl":"10.1016/j.powtec.2025.120794","url":null,"abstract":"<div><div>This study focuses on the explosion characteristics of aluminum (Al) powders, which have garnered significant attention as energy carriers due to their high energy density and reactivity. Specifically, it investigates the effect of oxygen concentration on the minimum explosible concentration (MEC). The experimental apparatus outlined in JIS Z8818 was modified to conduct experiments using O2-N2 mixtures. Various O2 concentrations ranging from 10 vol% to 50 vol% were tested to measure the MEC of Al powders. The results indicate that the MEC decreases with increasing O2 concentration, highlighting the critical role of O2 in the explosiveness of Al powders. Additionally, the validity of the theoretical model was verified by comparing the results of the continuum model calculations with the experimental data. This research provides a more accurate assessment of the explosion hazards of Al powders and offers foundational data for creating safer working environments. Furthermore, as a fundamental study, it contributes to the development of combustion systems for propulsion and energy applications, enhancing the understanding and design of efficient and safe energy systems.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120794"},"PeriodicalIF":4.5,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446125","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

Meso-scale numerical analysis of the role of Van der Waals adhesion and static friction in fluidized beds of fine solids

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-15 DOI: 10.1016/j.powtec.2025.120763

Youssef Badran , Dorian Dupuy , Bruno Blais , Vincent Moureau , Renaud Ansart , Jamal Chaouki , Olivier Simonin

引用次数: 0

Effect of TiO2 percentage on the hydrogen-based direct reducibility of high-grade pellets

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-15 DOI: 10.1016/j.powtec.2025.120813

Behzad Sadeghi , Pasquale Cavaliere , Mutlucan Bayat , Marieh Aminaei , Niloofar Ebrahimzadeh Esfahani , Aleksandra Laska , Damian Koszelow , Natalia Ramos Goncalves

{"title":"Effect of TiO2 percentage on the hydrogen-based direct reducibility of high-grade pellets","authors":"Behzad Sadeghi , Pasquale Cavaliere , Mutlucan Bayat , Marieh Aminaei , Niloofar Ebrahimzadeh Esfahani , Aleksandra Laska , Damian Koszelow , Natalia Ramos Goncalves","doi":"10.1016/j.powtec.2025.120813","DOIUrl":"10.1016/j.powtec.2025.120813","url":null,"abstract":"<div><div>The steel industry relies heavily on the direct reduction of iron ore pellets, which is a more environmentally friendly alternative to traditional blast furnaces, by reducing CO<sub>2</sub> emissions. This study investigated the effects of different TiO<sub>2</sub> contents on the reducibility of high-grade iron ore pellets using hydrogen (H<sub>2</sub>). The research employed HSC chemistry, COMSOL Multiphysics, and X-ray tomography to analyse the thermodynamics and kinetics of hematite reduction. The results indicate that TiO<sub>2</sub> significantly affects reducibility; pellets with less than 0.5 % TiO<sub>2</sub> show improved reducibility due to favorable microstructural changes, while higher TiO<sub>2</sub> content reduces porosity and slows down reduction rates. However, increasing the H<sub>2</sub> pressure to 8 bar mitigated the detrimental effects of the high TiO<sub>2</sub> content and improved the porosity and reduction kinetics. These results support the theoretical predictions, provide guidelines for optimizing pellet formulations, and emphasize the importance of controlling the TiO<sub>2</sub> content and operating conditions for efficient reduction processes.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120813"},"PeriodicalIF":4.5,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427522","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

Impact of draft plate on the separation performance of gas-solid cyclone separator

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-15 DOI: 10.1016/j.powtec.2025.120806

Yida Zhang, Shiliang Yang, Jianhang Hu, Hua Wang

{"title":"Impact of draft plate on the separation performance of gas-solid cyclone separator","authors":"Yida Zhang, Shiliang Yang, Jianhang Hu, Hua Wang","doi":"10.1016/j.powtec.2025.120806","DOIUrl":"10.1016/j.powtec.2025.120806","url":null,"abstract":"<div><div>Cyclone separators are extensively utilized in the mining, metallurgy, and energy industries due to their high efficiency in gas-solid separation. This study simulates gas-solid two-phase flow within a cyclone separator using the Eulerian-Lagrangian approach, with the mathematical model validated through experimental data. The influence of draft plates and inclination angle on flow patterns, particle dynamics, and separation efficiency is thoroughly investigated. The findings reveal that the incorporation of guide plates reduces energy losses and mitigates the detrimental effects of short-circuit flow on separator performance. Specifically, the pressure drop decreases as the draft plate angle increases, while a smaller draft plate angle significantly reduces short-circuit flow and enhances system stability. Moreover, draft plates effectively decrease the frequency of particle-wall collisions. At an optimal draft plate angle of 90°, the pressure drop is reduced by 71 %, and the short-circuit flow length decreases by 27 % compared to a traditional cyclone separator, indicating improved performance. Overall, this study demonstrates that the use of draft plates markedly enhances gas-solid phase interactions in cyclone separators.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120806"},"PeriodicalIF":4.5,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464407","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

Drag force modeling with induced surface deformation in granular media

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-15 DOI: 10.1016/j.powtec.2025.120757

Jiaxin Liu , Zhongkui Wang , Yang Tian , Longchuan Li , Shugen Ma

{"title":"Drag force modeling with induced surface deformation in granular media","authors":"Jiaxin Liu , Zhongkui Wang , Yang Tian , Longchuan Li , Shugen Ma","doi":"10.1016/j.powtec.2025.120757","DOIUrl":"10.1016/j.powtec.2025.120757","url":null,"abstract":"<div><div>The real-time modeling of interaction forces is essential for designing and controlling machines that traverse and manipulate granular materials. In a previous study, we analyzed the effects of motion-induced surface deformation at different depths and developed a depth-dependent drag force model based on the principles of resistive force theory (RFT). Through an energy variation analysis, we identified two primary factors that influence environmental changes: the generation of granular piles and changes in the local packing state. However, the role of object orientation has remained unexplored. In this study, we bridge this gap and extend the analysis to account for both depths and orientations, broadening the applicability of the model. To quantify the effect of orientation, we introduce the elastic potential energy as a measure of the packing state of granular media. This consideration contributes to integrating the induced surface deformation into the drag force model, providing physical insights into the prediction process. The model was validated through plate drag experiments and applied to predict the drag force of multi-connected plates, enhancing the accuracy of drag force prediction in scenarios involving significant surface changes. This real-time model offers a practical alternative to time-consuming computational methods, such as the discrete element method, enabling efficient analysis for a broader range of applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120757"},"PeriodicalIF":4.5,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438038","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

An efficient impact sampling strategy for small-body regolith: Dependence of collected mass on projectile ejection

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-14 DOI: 10.1016/j.powtec.2025.120798

Yang Wang , Wei Guan , Yan Wang

{"title":"An efficient impact sampling strategy for small-body regolith: Dependence of collected mass on projectile ejection","authors":"Yang Wang , Wei Guan , Yan Wang","doi":"10.1016/j.powtec.2025.120798","DOIUrl":"10.1016/j.powtec.2025.120798","url":null,"abstract":"<div><div>Impact sampling on small bodies has been proven feasible. However, particle flow laws during regolith sampling are unclear, and existing sampling mechanisms have significant potential for improvement. In this study, the discrete element method and multi-body dynamics (DEM-MBD) coupling model is used to explore the particle flow laws, and an efficient impact sampling strategy is developed which can significantly improve the collected particle mass. Two projectiles are placed symmetrically around the end of the sampler and fired simultaneously. In the event that only one projectile is successfully fired, the collected mass is still 7.9 times higher than that of existing sampling method. As particles accumulate near the transporting pipe, a clogging state occurs and obstructs the particle flow, causing the mass flow rate to drop rapidly. Particle clogging can be effectively reduced using a sampling strategy in which the probe reaches the target position and then fires the projectiles. We show that the particle-probe interaction can interfere with position and attitude of the probe and eventually reduce the collected mass of particles. To solve this problem, a proportional derivative (PD) controller is designed to stabilize the attitude and position of the probe. An ejection angle of 54° can significantly improve the sampling efficiency by balancing the number of driven particles and vertical velocity, and the particle mass obtained is 31 times higher than that of the existing method.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120798"},"PeriodicalIF":4.5,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428143","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

Understanding the impact of ultrafine phosphorus slag on the workability of cement paste

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-14 DOI: 10.1016/j.powtec.2025.120800

Yichen Shan , Shiyu Zhuang , Xiao Yu

引用次数: 0