Advanced Powder Technology最新文献

{"title":"CFD-DEM study on circulation pattern and particle suspension dynamics in PBT solid–liquid stirred tank","authors":"Zhichen Bi,&nbsp;Shiliang Yang,&nbsp;Jianhang Hu,&nbsp;Hua Wang","doi":"10.1016/j.apt.2025.104993","DOIUrl":"10.1016/j.apt.2025.104993","url":null,"abstract":"<div><div>The stirred tank is widely used in industrial processes for efficient material mixing. In this work, a multi-scale numerical model suitable for dense particle flow is established based on the CFD-DEM approach. After verifying the reliability of the model by comparing with experiments, the solid–liquid two-phase behaviors in a single-layer unbaffled pitched blade turbine (PBT) stirred tank under transitional flow regime are investigated at different stirring speeds. The chain effect of stirring speed- discharge stream-suspension dynamics and the hindering mechanism of isolated mixing zone in solid–liquid system are revealed. Results show that the discharge stream caused by the pitched blades, which is directly affected by the stirring speed dominates the formation of two main circulation structures and the isolated mixing regions (IMRs). Notably, when the stirring speed exceeds a threshold, which lies between 350 rpm and 450 rpm, the enhancement of suspension is significantly diminished. To elucidate the underlying mechanism responsible for this phenomenon in the transitional flow regime, this study employs a multi-scale and multi-physics analysis. The outcomes of this study present insights into solid–liquid flow dynamics and provide a theoretical basis for optimizing stirred tank performance.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 9","pages":"Article 104993"},"PeriodicalIF":4.2,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656704","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":"Efficient Monte Carlo simulations of coagulation based on weighted particle strategies","authors":"Yongjie Chen ,&nbsp;Muhao Chen ,&nbsp;Xi Xia ,&nbsp;James C. Hermanson ,&nbsp;Fei Qi","doi":"10.1016/j.apt.2025.105004","DOIUrl":"10.1016/j.apt.2025.105004","url":null,"abstract":"<div><div>In this paper, a class of efficient Monte Carlo methods based on weighted particle strategies for solving the coagulation population balance equation is presented. The adjustable coagulation resolution strategy is developed from probabilistic coagulation theories for general conditions. The particle reconstruction scheme accelerates simulations and reduces errors. Three components of the methods have been verified and validated against several benchmark coagulation scenarios with analytical solutions and a conventional constant-number method. The two methods, using stepwise-constant and size-dependent coagulation resolution, offer superior performance to the constant-number method in resolving regions with large and rare particles and higher-order moments without sacrificing computational efficiency. Moreover, the computation precision of both methods is significantly higher than the conventional methods, as the proposed method’s precision is proportional to the square root of the total number of coagulation events rather than being dependent on the computational particle number used by conventional methods.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 9","pages":"Article 105004"},"PeriodicalIF":4.2,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144634594","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":"Influence of corrugation geometry on sand-structure interface behavior","authors":"Aleksander Grabowski,&nbsp;Arkadiusz Jenta,&nbsp;Jakub Konkol,&nbsp;Michał Wójcik,&nbsp;Michał Nitka","doi":"10.1016/j.apt.2025.104988","DOIUrl":"10.1016/j.apt.2025.104988","url":null,"abstract":"<div><div>This paper presents laboratory investigations on the interface between sand and a sinusoidal corrugated surface under a constant normal load using a direct shear apparatus. Using 3D printing technology, a custom direct shear box was fabricated, enabling the construction of various corrugated surface topographies. It was shown that parts produced by FFF (Fused Filament Fabrication) method successfully replicated the properties of traditional metal components in the direct shear box. A series of interface shearing experiments was conducted using different sinusoidal corrugated surfaces. The relationship between the corrugation coefficient, <span><math><mrow><mi>d</mi><mo>/</mo><mi>l</mi></mrow></math></span> (where <em>d</em> represents wave depth and <em>l</em> represents wavelength), and the shear resistance of the interface was evaluated. Findings revealed that as the corrugation coefficient increased, the forces exerted on the surface and the volumetric changes also increase. Force measurements provided a friction coefficient against the surface, ranging from 0.335 to 0.883. The micro-behavior of the shear zone was analyzed using Digital Image Correlation (DIC), which enabled a qualitative description of failure mechanisms for various surfaces. For surfaces with low-corrugated, direct sliding of the material along the surface was observed, whereas for high-corrugated surfaces, the shear plane appeared above the corrugation valleys, within the material, and at the corrugation peaks. A critical corrugation coefficient, ranging from 0.053 to 0.147, was identified as the threshold between low-corrugated and high-corrugated interfaces. Based on the DIC analysis, the thickness of the shear zone was determined, ranging from 4<span><math><mrow><mo>×</mo></mrow></math></span><span><math><mrow><msub><mrow><mi>d</mi></mrow><mrow><mn>50</mn></mrow></msub></mrow></math></span> to 5<span><math><mrow><mo>×</mo></mrow></math></span><span><math><mrow><msub><mrow><mi>d</mi></mrow><mrow><mn>50</mn></mrow></msub></mrow></math></span>. Finally, this research provides valuable insights into the micro-behavior of the interface between granular material and sinusoidal corrugated surfaces.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 9","pages":"Article 104988"},"PeriodicalIF":4.2,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144613917","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 granular mixing performance in static mixer with wedge-block blending elements","authors":"Rui Tan ,&nbsp;Bei Wu ,&nbsp;Huaiyuan Qian ,&nbsp;Yusong Xie ,&nbsp;Bojun Cao ,&nbsp;Dawei Liu ,&nbsp;Xu Li ,&nbsp;Fangping Xie","doi":"10.1016/j.apt.2025.105005","DOIUrl":"10.1016/j.apt.2025.105005","url":null,"abstract":"<div><div>The static mixer captures immense attention as an efficient, energy-saving and low-cost device for mixing grain particles, which plays a critical role in improving food nutrition, tastes and cooking styles. This study pursues better performance of static mixer, and adopted the discrete element method to establish a particle-blanking mixing model for mung beans and brown rice. A self-designed wedge-block continuous collision static mixer was compared with the Kenics and the Low Pressure Drop (LPD) static mixers, and a bench test was carried out to evaluate the particle mixing of the three mixers. The results manifest that, in terms of mixing efficiency, the average flow rates of Kenics, LPD and wedge-block static mixers were 0.33 kg/s, 0.22 kg/s and 0.43 kg/s in the simulation, compared to 0.35 kg/s, 0.27 kg/s and 0.51 kg/s in the bench test, respectively. As for mixing uniformity, the relative standard deviation (RSD) values for Kenics, LPD and wedge-block static mixers were 24.95 %, 21.87 % and 7.44 % in the simulation, and 30.34 %, 35.93 % and 9.64 % in the bench test, respectively. In summary, the proposed wedge-block static mixer, able to boost the mixing rate and quality, is an ideal choice for the continuous production of pellet mixing, thanks to its superior mixing performance than Kenics and LPD in mixing mung bean and brown rice. These findings lay an essential basis for optimizing granular static mixer in the future.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 9","pages":"Article 105005"},"PeriodicalIF":4.2,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144604848","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":"Improved degradation of acetaminophen with NiO-TiO2 nanofibers synthesized through atomic layer deposition","authors":"Mahmoud Abid ,&nbsp;Tia Maria Howayek ,&nbsp;Olga Mazur ,&nbsp;Roman Viter ,&nbsp;Clémence Badie ,&nbsp;Zahraa El Charif ,&nbsp;Amr A. Nada ,&nbsp;Djamel Bezzerga ,&nbsp;Jisang Hong ,&nbsp;Lionel Santinacci ,&nbsp;Philippe Miele ,&nbsp;Igor Iatsunskyi ,&nbsp;Emerson Coy ,&nbsp;Geoffroy Lesage ,&nbsp;Roland Habchi ,&nbsp;David Cornu ,&nbsp;Mikhael Bechelany","doi":"10.1016/j.apt.2025.104991","DOIUrl":"10.1016/j.apt.2025.104991","url":null,"abstract":"<div><div>Light-driven water treatment methods have garnered significant attention for their ability to effectively degrade harmful pollutants. In this study, polyvinylpyrrolidone (PVP)-based titanium dioxide nanofibers were synthesized using a sol–gel method combined with electrospinning, followed by calcination at 500 °C. Nickel oxide (NiO) layers of 5, 10, and 20 nm thickness were subsequently deposited onto the nanofibers via atomic layer deposition (ALD) using bis(ethylcyclopentadienyl)nickel and ozone as chemical precursors. The structural and functional properties of the fibers were characterized using electron microscopy, surface area analysis, and various spectroscopic techniques. The incorporation of NiO into TiO₂ nanofibers enhanced light absorption, suppressed charge recombination, and improved photocatalytic performance under visible light, as confirmed by reflectance and photoluminescence spectra. Photocatalytic tests demonstrated that fibers with 5 nm NiO exhibited superior performance, achieving 91 % degradation of acetaminophen under visible light within 4 h, compared to 70 % for bare TiO₂. Moreover, the 5 nm NiO-coated fibers maintained their performance over five cycles, with a slight reduction of 28 %. Reactive species analysis revealed the involvement of hydroxyl and superoxide radicals in the degradation process. Density functional theory (DFT) calculations further elucidated that the enhanced photocatalytic efficiency of the NiO (5 nm)-TiO₂ composite (denoted as N5T) stems from optimized electron-hole separation and improved photon energy retention. These findings highlight the potential of N5T nanofibers for water treatment applications and provide valuable insights for the development of advanced light-driven catalysts.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 9","pages":"Article 104991"},"PeriodicalIF":4.2,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144604849","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":"Double-droplet microfluidic strategy for preparing spherical core–shell structured explosives: controlling shell thickness to enhance safety performance","authors":"Bidong Wu ,&nbsp;Yunyan Guo ,&nbsp;Yi Liu ,&nbsp;Zhihua Xue ,&nbsp;Fan Wang ,&nbsp;Qiang Guan ,&nbsp;Chongwei An ,&nbsp;Zhongliang Ma","doi":"10.1016/j.apt.2025.104994","DOIUrl":"10.1016/j.apt.2025.104994","url":null,"abstract":"<div><div>Octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX), as a high-performance explosive, is commonly used in military fields such as missile warheads, nuclear weapon charges, and solid rocket propellants. However, the high sensitivity of HMX limits its further applications. The versatility and controllability of core–shell structured explosives (CESs) can effectively achieve the modification research of energetic materials. Here, for the first time, we investigated the formation mechanism of HMX@DAAF core–shell microspheres through the double-droplet microfluidic strategy (DDMS) and successfully prepared core–shell microspheres with varying shell thicknesses according to this strategy. We explored the impact of the DAAF shell thickness on the morphology, structure, and performance of the core–shell microspheres and proposed a potential mechanism for the enhancement of safety performance of the core–shell microspheres. The results show that DDMS can produce HMX@DAAF core–shell microspheres with high sphericity, narrow particle size distribution, and good fluidity. The DAAF shell acts as a “shield” to protect the sensitive HMX inside, with its impact sensitivity and friction sensitivity increased to 100 J and 360 N, respectively. The study has demonstrated certain advantages in the tunability and structural construction of core–shell explosives, providing a simple and safe strategy for the preparation of high-quality core–shell structured materials.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 9","pages":"Article 104994"},"PeriodicalIF":4.2,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588080","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":"Sustainable application of coal fly ash: Alumina recovery from coal fly ash by low-temperature roasting with potassium persulfate","authors":"Jingjing Zou ,&nbsp;Yiping Sun ,&nbsp;Shuo Liang ,&nbsp;Zhongrui Shi ,&nbsp;Guanghe Li ,&nbsp;Chunbin Guo","doi":"10.1016/j.apt.2025.104986","DOIUrl":"10.1016/j.apt.2025.104986","url":null,"abstract":"<div><div>This study introduces a novel process for recovering Al₂O₃ from coal fly ash (CFA), utilizing potassium persulfate (K₂S₂O₈) as an activator, and explores the decomposition behavior of both crystalline and amorphous alumina phases within CFA. The experiment involved mixing K₂S₂O₈ with CFA in K₂S₂O₈/Al₂O₃ molar ratios ranging from 0.5:1 to 4:1, followed by calcination at varying temperatures and durations to optimize alumina extraction. The results indicated that the alumina extraction efficiency of 91 % was achieved with a molar ratio of 3:1 (K₂S₂O₈/Al₂O₃), calcination temperature of 405 °C, and reaction time of 2 h. X-ray photoelectron spectroscopy, scanning electron microscopy, and reaction kinetics were employed to analyze the reaction mechanism. The findings revealed that K₂S₂O₈ preferentially reacted with the amorphous alumina phase, leading to the breakage of Al–O–Si bonds. The release of SO₂ and O₂ during the reaction further facilitated the breakdown of the crystalline phase by disrupting aluminum–oxygen tetrahedra. Simultaneously, the silicon-oxygen tetrahedra decomposes and forms SiO₂ gel layer, wrapping the remaining aluminum oxygen octahedron, thus preventing further alumina extraction. This study contributes to a deeper understanding of the decomposition behavior of crystalline and amorphous alumina phases in CFA during sulfate roasting. The findings provide a theoretical foundation for refining alumina recovery processes and offer significant improvements to existing sulfate roasting methods.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 9","pages":"Article 104986"},"PeriodicalIF":4.2,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570228","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":"Influence of additive particle content and sintering temperature on the sinterability of electrostatically assembled alumina–alumina composite particles","authors":"Katsumi Fujishiro ,&nbsp;Wai Kian Tan ,&nbsp;Go Kawamura ,&nbsp;Atsunori Matsuda ,&nbsp;Hiroyuki Muto","doi":"10.1016/j.apt.2025.104982","DOIUrl":"10.1016/j.apt.2025.104982","url":null,"abstract":"<div><div>In this study, bimodal alumina (Al₂O₃) particles with average sizes of 830 nm and 140 nm were used, and an electrostatic assembly method was employed to control the formation of composite particles with varying contents of finer additive particles (140 nm), allowing the investigation of their effect on a pressureless sintering process. A homogeneous distribution of additive particles on the larger alumina core particles (830 nm) was achieved by varying the additive particle content from 12 to 40 vol%. The sinterability of the electrostatically assembled Al₂O₃–Al₂O₃ composite particles was then evaluated by sintering them at temperatures from 1300 to 1450 °C with a holding time of 5 h. The results indicated that the homogeneous distribution of the additive particles in the electrostatically assembled Al₂O₃–Al₂O₃ composite particles led to improved powder packing density and enhanced sinterability. This enabled the fabrication of denser sintered artifacts at lower sintering temperatures. These findings demonstrate that particle design using electrostatic assembly can promote a more efficient sintering process and reduce energy consumption in the fabrication of ceramic materials using powder metallurgy.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 9","pages":"Article 104982"},"PeriodicalIF":4.2,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570624","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":"Experimental and numerical investigation of liquid–solid contact electrification in a rolling oil tank","authors":"Haoyu Liu,&nbsp;Yanlin Zhao,&nbsp;Jun Yao,&nbsp;Wendong Fan,&nbsp;Yongxiang Zhang","doi":"10.1016/j.apt.2025.104983","DOIUrl":"10.1016/j.apt.2025.104983","url":null,"abstract":"<div><div>Factors influencing electrostatic generation in an oil tank are studied under rolling tank conditions including tank geometry, rolling angle and oil storage, which has little been studied and its working mechanism has never been discovered. This work aims to elucidate the mechanisms of electrostatic generation and accumulation in an oil tank and provide insights to mitigate electrostatic risks during oil transportation. Experiments were conducted using scaled-down stainless-steel oil tanks (light-weight, medium-weight, and heavy-weight) under several rolling conditions proposed. Electrostatic potentials were measured by a high-precision setup comprising a copper sphere and an electrometer. Numerical simulations were carried out to look into the free surface of oil movement and characterize turbulent behavior. It is found that the tank geometry significantly does affect electrostatic generation and accumulation, where the light-weight oil tank exhibits the highest electrostatic potential (103 V) and the medium-weight oil tank exhibits the lowest level (31 V). Increasing rolling angles (10°–30°) increase fluid movement as well as enhance electrostatic potential. Oil storage is found to play a critical role as that the lower level (10.5 %–21 %) leads to a higher electrostatic potential due to more oil-wall interacting. In addition, the friction-induced and contact-separation electrification is found to dominate the electrostatic generation. The medium-weight oil tank reduces sloshing dynamics obviously that can greatly minimize electrostatic risks. Both controlling the rolling angle and optimizing the oil storage are confirmed to mitigate hazards. In the end, this work increases safety theory to design oil tanks and increase the operation standard.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 9","pages":"Article 104983"},"PeriodicalIF":4.2,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563026","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":"Analysis of the relationship between main particle interaction force and compacted packing fraction in a smaller particle admixing system","authors":"Tatsuhiro Ninomiya,&nbsp;Mikio Yoshida,&nbsp;Yoshiyuki Shirakawa","doi":"10.1016/j.apt.2025.104979","DOIUrl":"10.1016/j.apt.2025.104979","url":null,"abstract":"<div><div>Particle bed packing fraction can be improved by admixing smaller particles with the main particles. However, the relationships of the packing fraction, which is a macroscopic property, with the particle interaction force in the particle bed, which is a microscopic property, remain to be fully elucidated. In this study, the compacted packing fraction was measured for samples with different mixing mass ratios of admixed particles. In addition, the interaction forces between main particles were calculated from the shear strength of the particle bed and the correlation between the interaction forces and the compacted packing fraction were examined. The change in the interaction force with the mixing mass ratios of admixed particles depended on normal stress applied to the particle bed. This result was explained by the different confined state of the particle bed, which were confined differently by the normal stress when the particles in the particle beds were moved by external forces. These results are useful for predicting the compacted packing properties of particle beds with smaller admixed particles.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 9","pages":"Article 104979"},"PeriodicalIF":4.2,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144557477","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}