Powder Technology最新文献_第8页

Generating realistic DEM shape using improved spherical harmonic reconstruction considering form, roundness, and roughness 考虑形状、圆度和粗糙度，利用改进的球谐波重构技术生成逼真的 DEM 形状

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-08 DOI: 10.1016/j.powtec.2025.120755

Songling Han , Changming Wang , Xiaoyang Liu , Mingmin Zhang

{"title":"Generating realistic DEM shape using improved spherical harmonic reconstruction considering form, roundness, and roughness","authors":"Songling Han , Changming Wang , Xiaoyang Liu , Mingmin Zhang","doi":"10.1016/j.powtec.2025.120755","DOIUrl":"10.1016/j.powtec.2025.120755","url":null,"abstract":"<div><div>The shape of particles significantly influences their mechanical properties, making accurate shape modeling crucial in numerical simulations. This paper proposes a framework for generating particles by applying improved spherical harmonic reconstructions to convex hull surfaces. The framework integrates mesh refinement techniques to enhance mesh resolution, enabling the generation of finer surface details than 3D laser scanning. Three parameters are introduced: <span><math><mo>∆</mo><msub><mi>K</mi><mn>1</mn></msub></math></span>, which controls roundness; <span><math><mo>∆</mo><msub><mi>K</mi><mn>2</mn></msub></math></span>, which governs roughness; and <span><math><msub><mi>R</mi><mi>d</mi></msub></math></span>, which represents the boundary between roundness and roughness in spherical harmonic reconstructions. Introducing these parameters not only allows independent control over the three levels of shape (form, roundness, and roughness) but also enhances the flexibility of the method, enabling the generation of various particle shapes. Granular assemblies with varying roundness and roughness distributions are generated and applied in discrete element method (DEM) simulations of triaxial shear. The results show that roundness is negatively correlated with the peak friction angle, while roughness is positively correlated. The proposed method enhances the ability to generate complex particle shapes, offering a practical tool for modeling and simulating granular materials.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120755"},"PeriodicalIF":4.5,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422211","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

An overlappable coarsening strategy for discrete element method simulations of bi-disperse granular flows

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-08 DOI: 10.1016/j.powtec.2025.120765

Yaxiong Yu , Fan Duan , Lingxue Wang , Qiang Zhou

{"title":"An overlappable coarsening strategy for discrete element method simulations of bi-disperse granular flows","authors":"Yaxiong Yu , Fan Duan , Lingxue Wang , Qiang Zhou","doi":"10.1016/j.powtec.2025.120765","DOIUrl":"10.1016/j.powtec.2025.120765","url":null,"abstract":"<div><div>The coarsening strategy provides a promising avenue for industrial applications of the discrete element method by profoundly reducing computational costs. However, its application in multi-particle-size systems often results in underestimations of the packing solid volume fraction when employing different coarsening ratios. To address this issue, we propose a novel overlappable coarse-grained model specifically designed for bi-disperse systems. In this model, particles are allowed to overlap to a certain extent without experiencing collision forces, with the degree of overlapping described by an overlapping coefficient. This coefficient is determined through fitting discrete element method simulation of bi-disperse packings. Posterior analyses reveal that the traditional coarse-grained discrete element method significantly underpredicts the packing solid volume fraction and consequently the segregation behavior. In contrast, our proposed overlappable coarsening strategy accurately predicts both the packing solid volume fraction and segregation behavior when employing the fitted overlapping coefficient.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120765"},"PeriodicalIF":4.5,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422432","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

Enhancement and mechanistic study of ilmenite aeration leaching for synthetic rutile production using a horizontal reactor

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-07 DOI: 10.1016/j.powtec.2025.120740

Lei Zhou , Qiu-Yue Zhao , Guo-Zhi Lv , Zhi-He Dou , Ting-An Zhang

{"title":"Enhancement and mechanistic study of ilmenite aeration leaching for synthetic rutile production using a horizontal reactor","authors":"Lei Zhou , Qiu-Yue Zhao , Guo-Zhi Lv , Zhi-He Dou , Ting-An Zhang","doi":"10.1016/j.powtec.2025.120740","DOIUrl":"10.1016/j.powtec.2025.120740","url":null,"abstract":"<div><div>The Becher process is an eco-friendly technology that produces synthetic rutile by aeration leaching of metallic iron from reduced ilmenite. However, the method is highly time-consuming and requires enhanced efficiency. The study employed a horizontal reactor (HR) as an alternative to the conventional vertical reactor (VR), utilizing the response surface methodology (RSM) to optimize the process in both reactors. Results indicate that at 80 °C and an 8 mL/g liquid-solid ratio, the aeration efficiency of metallic iron in the HR reached 97.3 % in 6 h. In contrast, the VR yielded only 80.9 %, with HR significantly enhancing the reaction rate. The study also examined the apparent kinetics of the aeration leaching process and the electrochemical corrosion kinetics of metallic iron under aeration conditions, revealing that the reaction control steps in both HR and VR are surface chemical reactions. CFD simulation characterized the fluid flow behavior within the HR and VR, showing that the turbulence within the HR is more substantial and uniform, facilitating a superior mixing effect. And the HR generates smaller bubble sizes, allowing the solution to reach higher dissolved oxygen concentrations more quickly, thus improving efficiency. The obtained understanding and methodology shed light on the mechanism of HR and lay the groundwork for research on optimizing fluid mixing and mass transfer to enhance aeration efficiency.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120740"},"PeriodicalIF":4.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402641","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

Characterization and microscopic mechanism analysis of urea-modified dry water powders for inhibiting dust explosion of aluminum‑magnesium alloys

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-07 DOI: 10.1016/j.powtec.2025.120760

Shizemin Song , Xiangbao Meng , Xunxian Shi , Yadi Li , Jihe Chen , Yujian Zhu , Zhao Qin , Xiaozhen Yu

{"title":"Characterization and microscopic mechanism analysis of urea-modified dry water powders for inhibiting dust explosion of aluminum‑magnesium alloys","authors":"Shizemin Song , Xiangbao Meng , Xunxian Shi , Yadi Li , Jihe Chen , Yujian Zhu , Zhao Qin , Xiaozhen Yu","doi":"10.1016/j.powtec.2025.120760","DOIUrl":"10.1016/j.powtec.2025.120760","url":null,"abstract":"<div><div>Aluminum‑magnesium alloy has been widely used in electronics, automotive, aerospace and other fields due to its advantages of high strength, low density and good heat dissipation. The accompanying aluminum‑magnesium alloy dust explosion accidents have been increasing. In order to prevent the occurrence of this accident, a new type of urea-modified dry water (UMDW) powder was prepared by using urea solution as a core material, which was applied to the suppression of aluminum‑magnesium alloy dust explosion. Experiments on dust explosion pressure and flame propagation characteristics were carried out, and the explosion products were analyzed by XRD, XPS and other testing methods. The results showed that after the addition of 40 wt% UMDW, the maximum explosion pressure of aluminum‑magnesium alloy dust decreased from 0.621 MPa to 0.093 MPa, with a decrease of 85.02 %; (dp/dt)<sub>max</sub> decreased from 11.6 MPa/s to 1.29 MPa/s, with a decrease of 88.88 %; the flame propagation height decreased from 600 mm to 269.54 mm. The flame propagation height decreased from 600 mm to 269.54 mm, and the flame propagation speed decreased from 5.51 m/s to 0.7 m/s. Chemkin pro was used to perform temperature sensitivity analysis to find out the key reaction steps of UMDW on the explosion suppression of aluminum and magnesium alloys dust, and to reveal its microscopic and efficient explosion suppression mechanism.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120760"},"PeriodicalIF":4.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422213","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

Comprehensive analysis of FeMn powder fabricated using ultrasonic atomization technique

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-07 DOI: 10.1016/j.powtec.2025.120725

Sabrina Alam Khan , Mohammad Reza Vaziri Sereshk , Benjamin D. Nelson

{"title":"Comprehensive analysis of FeMn powder fabricated using ultrasonic atomization technique","authors":"Sabrina Alam Khan , Mohammad Reza Vaziri Sereshk , Benjamin D. Nelson","doi":"10.1016/j.powtec.2025.120725","DOIUrl":"10.1016/j.powtec.2025.120725","url":null,"abstract":"<div><div>Ultrasonic atomization (UA) machines have recently been developed and presented to the market, leading to the need for understanding the characteristics of the produced powders. The current focus in characterizing UA fabricated powders is on assessing flowability, particle size distribution, and powder morphology. However, there is a lack of detailed evaluation of the chemical composition of the fabricated powders, which is crucial in determining the mechanical properties of the parts made from these powders. For the first time, intense Energy Dispersive X-ray Analysis (EDS) was conducted on a substantial number of custom powders of Fe-xMn alloy produced using the UA technique. The powders exhibited a highly spherical shape with a narrow size distribution, primarily within the range of 35–55 μm, making them very promising for 3D printing applications. However, the EDS results indicated that segregation or depletion of Mn occurred during particle formation and is associated with the surface area to volume ratio of the produced powders. When the ratio is greater than 0.1, the particles are entirely depleted of Mn, and an abnormally high concentration of Mn was detected for ratios less than 0.1. We have proposed a schematic model of the UA process during particle formation that takes into account the segregation behavior of Mn based on the particle size of the produced powder.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120725"},"PeriodicalIF":4.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427523","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

Improved level set method for particle reconstruction from X-ray computed tomography images

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-07 DOI: 10.1016/j.powtec.2025.120743

Tingxuan Wang , Wenbin Fei , Krista A. Ehinger , Tom W. Drummond , Guillermo A. Narsilio

{"title":"Improved level set method for particle reconstruction from X-ray computed tomography images","authors":"Tingxuan Wang , Wenbin Fei , Krista A. Ehinger , Tom W. Drummond , Guillermo A. Narsilio","doi":"10.1016/j.powtec.2025.120743","DOIUrl":"10.1016/j.powtec.2025.120743","url":null,"abstract":"<div><div>The heat and fluid flow properties of granular materials are largely controlled by their 3D microstructures. With recent advancements in image-based network modeling, heat transfer and fluid dynamic physics can be effectively simulated. Model accuracy depends on precise 3D reconstruction of particles from X-ray computed tomography (XRCT) images; however, existing workflows that combine watershed algorithms with level set methods require subjective manual inputs in preprocessing and lack controllability in optimization processes. To address these problems, this work proposes an automated workflow that can achieve high precision in the 3D reconstruction of particles. Oversegmentation instances by the traditional watershed algorithm are eliminated through morphological dilations, providing better inputs for the level set optimization process to lay a solid foundation for particle boundary extraction. The results of the proposed level set method are validated with paired multiresolution images of nearly spherical Ottawa and irregular angular sand. Compared with the current state-of-the-art method, the proposed method consistently and significantly obtains smoother particle boundaries and more accurate particle volumes and interparticle contact areas.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120743"},"PeriodicalIF":4.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422294","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

Heterovalent double-site substitution to induce the metal-to-metal charge transfer for yellow ZrSiO4: Bi3+/V5+ pigments

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-07 DOI: 10.1016/j.powtec.2025.120746

Yuting Gong, Yanru Zhao, Junfu Liu, Chengming Qiu, Yun Gao, Xiaohong Xia, Kevin P. Homewood, Binglong Lei

{"title":"Heterovalent double-site substitution to induce the metal-to-metal charge transfer for yellow ZrSiO4: Bi3+/V5+ pigments","authors":"Yuting Gong, Yanru Zhao, Junfu Liu, Chengming Qiu, Yun Gao, Xiaohong Xia, Kevin P. Homewood, Binglong Lei","doi":"10.1016/j.powtec.2025.120746","DOIUrl":"10.1016/j.powtec.2025.120746","url":null,"abstract":"<div><div>Light extinction from charge transfer transitions can create extremely strong visible-light absorption to produce brilliant inorganic pigments. In this work, a heterovalent pair of Bi<sup>3+</sup> and V<sup>5+</sup> is incorporated into ZrSiO<sub>4</sub> to replace both the Zr<sup>4+</sup> and Si<sup>4+</sup> sites to obtain new yellow pigments of ZrSiO<sub>4</sub>: Bi<sup>3+</sup>/V<sup>5+</sup> (referred to as ZS: BiV). By comparison with the conventional yellow BiVO<sub>4</sub> and blue ZrSiO<sub>4</sub>:V<sup>4+</sup> pigments and several ZrSiO<sub>4</sub>: M<sup>3+</sup>/V<sup>5+</sup> (M = Sc, Al, B and Y) powders, it is confirmed that the coloration of the ZS: BiV pigments originates primarily from the metal-to-metal charge transfer (MMCT) from Bi-6 s to V-3d and not from the ligand-to-metal charge transfer (LMCT) from O-2p to V-3d. Calculation of the MMCT energies vindicates a lower energy requirement in ZS: BiV than that in BiVO<sub>4</sub>. The DFT calculation and comparison with some analogous compounds further exclude any coloration contribution from the LMCT transition. Furthermore, the ZS: BiV pigments are confirmed to be thermally and chemically stable in ceramic glazes, enabling the application for ceramic decoration at temperatures over 1100 K. The strategy of heterovalent double-site substitution to construct a strong MMCT transition provides a powerful route to create many attractive coloring systems for future applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120746"},"PeriodicalIF":4.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422296","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 electrostatics of a single-particle transported in a bifurcated pipe

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-07 DOI: 10.1016/j.powtec.2025.120762

Haoyu Liu, Yanlin Zhao, Seng Tian, Jun Yao

{"title":"The electrostatics of a single-particle transported in a bifurcated pipe","authors":"Haoyu Liu, Yanlin Zhao, Seng Tian, Jun Yao","doi":"10.1016/j.powtec.2025.120762","DOIUrl":"10.1016/j.powtec.2025.120762","url":null,"abstract":"<div><div>Electrostatics generation due to particle-wall contact is popularly found in gas-solid systems. The working mechanism is unclear due to the complexity of particle behavior in turbulent pipe flows. This work aims to investigate the working mechanism of electrostatics generated by a single particle in a bifurcated pipe, which includes three parts: a straight part (<em>a)</em>, a bifurcation part (<em>b)</em> and another straight part (<em>c)</em> after the bifurcation. The electrostatics was measured by an induced method together with particle trajectories taken by a high-speed camera. The statistics of particle trajectories indicate that particle-wall collision and particle rolling play the main role in determining the electrostatics generation while they vary much in each part. In part <em>a</em> of the bifurcated pipe, particle rolling distance dominates the electrostatics generation, longer rolling distance and higher electrostatics. In part <em>b</em> of the bifurcated pipe, electrostatics charge generated is dominated by particle-wall collisions rather than particle rolling, which is independent of particle material and particle size. For the whole bifurcated pipe, the electrostatics generation is determined by part <em>c</em>. For all particles tested in this paper, the lowest level of electrostatics generation is at part <em>a</em>, while the highest level is at part <em>c</em> (excluding 5 <em>mm</em> glass bead at part <em>b</em>). The electrostatics generated by glass beads is higher than that by <em>PP</em> particles, and that by spherical <em>PP</em> is higher than that by elliptical <em>PP</em> particle.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120762"},"PeriodicalIF":4.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143386591","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 production comparison between the conventional and blade-designed two-fluid pressure nozzles via CFD simulation

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-07 DOI: 10.1016/j.powtec.2025.120747

Che-Hao Hsu , Hong-Ping Cheng , Kuang-Hsiang Liu , Chien-Hsun Lee , Chin-Chi Cheng

引用次数: 0

Investigation of the critical flow velocity for detachment between various hydrophobic glass beads and bubbles in turbulent flow field

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-07 DOI: 10.1016/j.powtec.2025.120745

Mianyan Yang, Zhijun Zhang

{"title":"Investigation of the critical flow velocity for detachment between various hydrophobic glass beads and bubbles in turbulent flow field","authors":"Mianyan Yang, Zhijun Zhang","doi":"10.1016/j.powtec.2025.120745","DOIUrl":"10.1016/j.powtec.2025.120745","url":null,"abstract":"<div><div>The critical flow velocity required to detach glass beads (soda-lime) of different hydrophobicity from bubbles was investigated. Using a home-made turbulence controlling system to observe the centrifugal motion of glass beads. The results indicated that different flow velocities were achieved by controlling the rotational speed. Different flow velocity indirectly affected the centrifugal acceleration when the centrifugal detachment of glass beads occurred. When the flow velocity exceeded the critical value, the different hydrophobic glass beads and bubble aggregates experienced centrifugal detachment force also reached the critical value. Due to the pinning effect, the more hydrophobic the glass beads attached to the bubbles, the more stable the aggregates formed. It was necessary to increase the flow velocity to enhance the centrifugal detachment force. The three-phase contact line (TPCL) between glass beads and bubbles rapidly slipped and contracted when attachment force was less than detachment force in centrifugal motion. Resulting in a noticeable necking phenomenon that completed the detachment. Meanwhile, the detachment behavior between glass beads and bubbles did not occur at specific locations, but rather randomly. It was depended on the size and strength of the vortex at that location, as well as the stability of attachment between bubbles and various glass beads.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120745"},"PeriodicalIF":4.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143386590","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