Powder Technology最新文献

{"title":"Numerical investigation of a new technique to reduce pipeline elbow erosion employing branching path with flow control of butterfly valves and orifices","authors":"Ahmadreza Veiskarami,&nbsp;Maysam Saidi","doi":"10.1016/j.powtec.2025.120761","DOIUrl":"10.1016/j.powtec.2025.120761","url":null,"abstract":"<div><div>A numerical erosion study was performed using Computational Fluid Dynamics (CFD) integrated with a Discrete Phase Model (DPM) on a standard 90° elbow, branch pipe elbow, and the effects of using a butterfly valve and orifice to control the flow. The butterfly control valve was studied at 20°, 40°, 60°, and 80° rotation angles around its axis, as well as at an orifice with a hole plate diameter of 20 %, 40 %, 60 %, and 80 % of the pipe diameter. In this study, the Euler-Lagrange approach was used to model two-phase flow with one-way coupling. After the fluid phase and non-spherical solid particles entered the pipe, the geometry erosion was calculated using the confirmed particle restitution model and erosion model. The numerical results showed that the branching pipe passes 30.9 % of the flow through the branching part, which reduces elbow erosion by 4.7 %. For this purpose, the use of the control valve and the orifice before the elbow increases the passage of the maximum two-phase flow of gas-particles up to 89.7 % and 96.4 %, respectively, in the branching path of the straight pipe. This leads to less impact of particles on the wall of the elbow compared to the complete passage of the flow in the path of the elbow. Therefore, the erosion damage in the elbow part of the branch pipe with 4 cases of the butterfly control valve is 61.1 %, 56.2 %, 24.7 %, and 4.5 % and the branch pipe with orifice 4 cases is 64.8 %, 54.9 %, 46.4 %, and 19.9 % compared to the normal state is reduced, which led to the improvement and replacement of the branching straight pipe path with only the elbow path.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120761"},"PeriodicalIF":4.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143386592","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":"Enhancing packing efficiency in coal water slurry systems through multi-model particle size distribution optimization","authors":"Binglong Zhao ,&nbsp;Baonan Zhou ,&nbsp;Zhenpu Chu ,&nbsp;Junguo Li ,&nbsp;Shunxuan Hu ,&nbsp;Changning Wu ,&nbsp;Ke Liu","doi":"10.1016/j.powtec.2025.120729","DOIUrl":"10.1016/j.powtec.2025.120729","url":null,"abstract":"<div><div>This study proposes a comprehensive approach for optimizing particle size distributions (PSDs) in coal water slurry (CWS) systems to enhance packing efficiency (PE). By integrating the Particle Swarm Optimization (PSO) model with PE model and PSD description models, ideal PSDs for single-peak, double-peak, and triple-peak distributions were developed. For the single-peak distribution, the R-R distribution model was applied to describe the PSD. High PE is achieved when the <span><math><msub><mi>d</mi><mi>x</mi></msub></math></span> range falls between 120 and 250 μm, with <span><math><mi>β</mi></math></span> (characteristic parameters) values ranging from 0.7 to 0.85. The shape and PE of the triple-peak distribution closely resemble those of the double-peak distribution, featuring a higher proportion of large particles compared to the single-peak distribution. This suggests that the double-peak distribution is better suited for preparing industrial CWS with a notable presence of large particles. The proposed method offers a practical and efficient approach to optimize PSDs for the preparation of highly concentrated CWS.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120729"},"PeriodicalIF":4.5,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378714","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":"The influence of operational parameters on the axial transport behavior of a bidisperse particle assembly of spherical particles in rotary kilns","authors":"Haozhi Jie,&nbsp;Fabian Herz","doi":"10.1016/j.powtec.2025.120739","DOIUrl":"10.1016/j.powtec.2025.120739","url":null,"abstract":"<div><div>In a bidisperse particle system, a mathematical model based on the segregation induced ring-core structure was established and applied to calculate the residence time and the axial velocity of particles of different sizes within a rotary kiln. Additionally, validation experiments were conducted in a pilot-scale rotary kiln using particles of 2 mm and 4 mm size as experimental materials. The entire process was recorded by observing the transport of the tracer particles from the inlet to the outlet. Additionally, the average axial velocity of each type of particle in each region of the kiln can be obtained. At the outlet, the tracer particles were collected and analyzed based on statistics and diffusion theory. The experimental data were converted into residence time distribution (RTD) formulas, and corresponding mean residence time (MRT), variance, axial dispersion (Dz), and Peclet number (Pe) were derived. The MRT obtained from the experiments is in accordance with the results calculated by the mathematical ring-core structure model, thereby proving the effectiveness and accuracy of the mathematical model presented in this paper. Moreover, the influence of the rotary kiln rotational speed, inclination angle, and feed mass flow rate on MRT and RTD is validated by the experiments. Based on the analysis of particle motion within the kiln, the impact of different transversal motion modes on segregation was also verified.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120739"},"PeriodicalIF":4.5,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349458","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}

{"title":"Dynamics of proppant particle settling within low Reynolds numbers: Roles of particle shape, surface wettability, wall factor, and fluid elasticity","authors":"Facheng Gong ,&nbsp;Yimei Chen ,&nbsp;Ke Hai ,&nbsp;Ludan Zhang ,&nbsp;Yuchuan Chang ,&nbsp;Shanshan Yao","doi":"10.1016/j.powtec.2025.120741","DOIUrl":"10.1016/j.powtec.2025.120741","url":null,"abstract":"<div><div>Characterizing proppant settling in fracturing fluids is essential for optimizing hydraulic fracturing operations. However, the dynamics of proppant settling in viscoelastic fluids within low Reynold numbers remain unclear. In this work, we investigate the settling behavior of real proppants in a narrow space filled with viscoelastic partially hydrolyzed polyacrylamide (HPAM) solutions to quantify the effects of proppant shape, surface wettability, fracture walls, and fluid elasticity on settling dynamics. Experimental results indicate wall factors lower than studies in literature and negligible influence of particle surface wettability on settling despite different contact angles between resin-coated and non-coated proppants. Fluid elasticity reduces the drag on proppants exponentially, which supports an observation that making thicker HPAM solutions does not always lead to slower proppant settling. New correlations of drag coefficient and terminal settling velocities are developed to quantify the effects of wall retardation and fluid elasticity on particle settling in viscoelastic fluids.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120741"},"PeriodicalIF":4.5,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143386589","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":"Study on microstructure, mechanical properties and chloride ion binding of sea sand reactive powder concrete by multi-mineral admixture system","authors":"Lincai Ge ,&nbsp;Haitao Li ,&nbsp;Xin Xue ,&nbsp;Shuai Liu","doi":"10.1016/j.powtec.2025.120738","DOIUrl":"10.1016/j.powtec.2025.120738","url":null,"abstract":"<div><div>In order to study the effects of silica fume, S105 slag powder, and fly ash on the mechanical properties, workability, and chloride ion binding effect of sea sand reactive powder concrete (SSRPC) with different contents and combination systems, scanning electron microscopy (SEM), X-diffraction analysis (XRD), and nuclear magnetic resonance (NMR) techniques were used to investigate the mechanical properties and chloride ion binding mechanism. The results showed that at 90 days, the mechanical properties of M-GFS4 in the three-doped system were optimal, and the compressive strength increased by 5.15 %, 1.65 %, and 2.66 %, and the splitting tensile strength increased by 14.81 %, 6.89 %, and 8.86 %, respectively, compared with those of M-S, M-FS, and M-GS. With the incorporation of fly ash or slag powder, the free chloride ion in the matrix gradually decreased and the binding ratio gradually increased. At the late stage of hydration, Friedel's salt gradually decomposed.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120738"},"PeriodicalIF":4.5,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349457","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":"Research on the influence of phosphorus regulation on the explosion suppression performance and mechanism of NiB/Hβ-Al2O3 suppressant","authors":"Jin Han ,&nbsp;Wenxi Shi ,&nbsp;Fei Wang ,&nbsp;Jinshe Chen ,&nbsp;Shengjing Dongye ,&nbsp;Haiyan Chen ,&nbsp;Yang Zhang ,&nbsp;Yuzhen Zhu","doi":"10.1016/j.powtec.2025.120742","DOIUrl":"10.1016/j.powtec.2025.120742","url":null,"abstract":"<div><div>This paper introduces a novel approach to addressing the coal dust explosion. A phosphorus-regulated NiB/Hβ-Al₂O₃ suppressant was prepared through in-situ synthesis. The flame propagation behavior and the suppression performance were tested. The results demonstrate that after phosphorus regulating, the inhibition performance is notably enhanced. By increasing the addition, a significant decrease in flame brightness and propagation distance was observed. Concurrently, a notable decline in both the maximum pressure and its rate of increase was observed. Based on the experimental results, the mechanism for the explosion suppression of phosphorus-regulated NiB/Hβ-Al₂O₃ is proposed. Hβ can adsorb free radicals and interrupt chain reactions. Meanwhile, Al₂O₃ adsorbs on the surface of coal dust, preventing heat transfer. The NiBP decomposes, absorbing heat and the generated free radicals Ni· and B·, thereby interrupting the explosion chain reaction. Notably, the P· not only effectively adsorbs free radicals but also has efficient synergistic effects with Ni· and B·.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120742"},"PeriodicalIF":4.5,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372349","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":"Excelling mechanical response of a powder metallurgy medium entropy alloy under extreme loading conditions","authors":"Atif Muhammad ,&nbsp;Yulong Li ,&nbsp;Du Bing ,&nbsp;Aamir Raza Muhammad ,&nbsp;Zakir Sheikh Muhammad","doi":"10.1016/j.powtec.2025.120737","DOIUrl":"10.1016/j.powtec.2025.120737","url":null,"abstract":"<div><div>Elevated temperatures coupled with dynamic loads present formidable challenges in advanced applications. Using advanced powder metallurgy (PM), CoCrNi, an FCC alloy, was crafted with ultrafine-grained microstructure devoid of any second phase, oxides, or precipitates. Despite the ultrafine microstructure, the material retains its work hardening at room and elevated temperatures. The yield strength of PM alloy shows a 300 % elevation compared to cast alloy at room temperature. Microstructural analysis revealed that mechanical performance stems from the synergistic effect of refined microstructure and nano-domain defects, including stacking faults, dislocations, twining, and nano-grains in raw materials. During dynamic deformation, multivariant twins evolved to contribute towards strengthening and work hardening. Saliently, the alloy exhibits remarkable high-temperature strength and resilience without softening or fracturing. The presence of nano-twins at high temperatures is one of the reasons for the thermal stability of material at elevated temperatures.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120737"},"PeriodicalIF":4.5,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143265808","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":"Numerical study of the effect of cylinder–to–cone ratio on the classification performance in hydrocyclones","authors":"Dianyu E ,&nbsp;Hongwei Hu ,&nbsp;Cong Tan ,&nbsp;Yuhao Zhang ,&nbsp;Guangtai Xu ,&nbsp;Jiaxin Cui ,&nbsp;Ruiping Zou ,&nbsp;Aibing Yu ,&nbsp;Shibo Kuang","doi":"10.1016/j.powtec.2025.120736","DOIUrl":"10.1016/j.powtec.2025.120736","url":null,"abstract":"<div><div>The separation space of hydrocyclone, including its cylindrical and conical sections, governs internal fluid dynamics and significantly affects classification performance. While the individual effects of these two sections are well–studied, the effects of cylinder–to–cone ratio (CCR) remain insufficiently explored. This study utilizes numerical simulations to assess the effects of different CCRs on hydrocyclone performance metrics, including classification performance, flow field characteristics, and volume fraction distributions across seven CCR configurations. The results show that as CCR increases from 1:9 to 9:1, the cut size increases from 16.4 μm to 30.4 μm, Ecart probable increases from 6.1 μm to 9.5 μm, the pressure drop decreases by 11 kPa, and the water split drops from 5.8% to 3.7%. Additionally, a smaller CCR enhances tangential velocity and pressure gradient, improves particle classification, stabilizes the air core, and reduces particle misplacement. These findings offer valuable insights into optimizing hydrocyclone design and classification performance to meet diverse application needs.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120736"},"PeriodicalIF":4.5,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143265807","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":"An advanced calibration technique for contact parameters in ball milling DEM simulations","authors":"Jiawei Wang ,&nbsp;Longxu Zhou ,&nbsp;Suinian Liu ,&nbsp;Zhongcheng Deng ,&nbsp;Zhao Cao ,&nbsp;Pei Li","doi":"10.1016/j.powtec.2025.120716","DOIUrl":"10.1016/j.powtec.2025.120716","url":null,"abstract":"<div><div>This article proposes an advanced calibration technique for contact parameters in ball mill DEM simulations, introducing 3 innovations. First, the friction coefficients between particles and grinding media are calibrated using the draw down test, accurately reflecting dynamic contact characteristics. Second, the coefficient of restitution is derived by combining both non-fracture and fracture conditions, using weighted calculations based on the distribution of fracture energy. Third, the minimum impact energy is defined using Tavares-King's damage-fracture model, setting it at the energy level that causes the cumulative fracture probability of the fine particle to exceed 50 % after 10 impacts, thereby avoiding meaningless data in the collision energy spectrum. These innovations may enhance DEM simulation accuracy by providing a more realistic mechanical environment for ball milling, laying a solid foundation for the application of the advanced comminution model.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120716"},"PeriodicalIF":4.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103821","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":"Variations in GARS powder microstructure as a function of powder chemistry and particle size","authors":"Matthew deJong ,&nbsp;Jordan Tiarks ,&nbsp;Iver Anderson ,&nbsp;Chad Parish ,&nbsp;Jennifer Forrester ,&nbsp;Saul Lapidus ,&nbsp;Timothy Horn ,&nbsp;Djamel Kaoumi","doi":"10.1016/j.powtec.2025.120734","DOIUrl":"10.1016/j.powtec.2025.120734","url":null,"abstract":"<div><div>The properties of metal produced through powder metallurgy depends on the feedstock used. Powders produced via gas atomization reaction synthesis (GARS) are used to produce oxide dispersion strengthened alloys. The desired powder size range can vary for each consolidation technique. However, powder microstructure also can vary with powder particle size, which in turn can impact the microstructure and properties of the consolidated parts. In this study, GARS powders are characterized via inductively coupled plasma mass spectroscopy, inert gas fusion, and high-resolution x-ray diffraction to determine variations in elemental and phase compositions. Transmission electron microscopy was used to understand microstructure variations as a function of chemistry and size. Across the three batches tested intermetallic content was 0.73–1.35 wt% in the 0-20 μm powder batch and increased to 2.46–3.80 wt% in the coarse 45-106 μm batch. Across all batches, volume percent of surface oxidation decreased with powder diameter, with volume percents within the range of 0.75–1.2 % across 10 μm powder particles, and below 0.4 % across coarse powder particles approximately 100 μm in diameter. These observations were supported by inert gas fusion measurements. However, the oxide layer was thicker in coarse powder particles due to a slower cooling rate. Increasing oxygen content in atomization gas to 2000 ppm and adding yttrium increased both the surface oxidation content and yttrium intermetallic content. Lastly, intermetallic phases within the powder coarsened with powder size. Intermetallic morphology changed from fine spherical intermetallic and columnar dendritic growth to a cellular structure with finer spherical intermetallic, to coarse irregular intermetallic and intermetallic along grain boundaries as a result of slower cooling rate and solidification rate in coarse powder particles. The addition of zirconium does not appear to significantly change intermetallic morphology, but the composition changed from a Y-Fe rich intermetallic to a Y-Zr-Fe intermetallic.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120734"},"PeriodicalIF":4.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377461","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}