Particuology最新文献_第6页

IF 4.1 2区材料科学

Particuology Pub Date : 2025-07-22 DOI: 10.1016/j.partic.2025.07.006

Angel Santarossa , Olfa D’Angelo , Achim Sack , Thorsten Pöschel

引用次数: 0

Subgrid drag models for simulating circulating turbulent fluidized beds of Geldart A particles 模拟Geldart A颗粒循环湍流流化床的亚网格阻力模型

IF 4.3 2区材料科学

Particuology Pub Date : 2025-07-19 DOI: 10.1016/j.partic.2025.07.012

Hongji Liu , Shanwei Hu , Xinhua Liu

{"title":"Subgrid drag models for simulating circulating turbulent fluidized beds of Geldart A particles","authors":"Hongji Liu , Shanwei Hu , Xinhua Liu","doi":"10.1016/j.partic.2025.07.012","DOIUrl":"10.1016/j.partic.2025.07.012","url":null,"abstract":"<div><div>The novel circulating turbulent fluidized bed (CTFB) technology has found wide applications in various processes owing to its high solid circulation rate and low backmixing. However, up to now, only a limited number of CFD simulation studies on this type of reactor can be found in the literature. Moreover, there is currently no guidance available for selecting appropriate subgrid drag models that take into account the impact of mesoscale structures. In this work, a two-fluid model incorporating seven different drag models include homogeneous drag models, filtered models, and EMMS-based drag models was employed to conduct a systematic investigation into the hydrodynamics of CTFB reactors. It was found that the flow structure in the CTFB reactor differs significantly from conventional fast fluidized beds, exhibiting relatively weaker radial heterogeneity and attenuated near-wall particle downward flows. Comparative analysis demonstrates that the homogeneous drag models fail to predict reasonable hydrodynamics consistent with the experiments. In contrast, the mesoscale drag models show satisfactory performance in reproducing solid concentration profiles, while additional marker variables should be considered in the drag models to enhance the prediction accuracy of particle velocity. The EMMS-based drag model with an advanced conservation equation for cluster size achieves better accuracy in predicting both solid concentration and velocity distributions. Nevertheless, future model development should address wall boundary effects to enhance mesoscale drag applicability in CTFB simulations.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"104 ","pages":"Pages 302-312"},"PeriodicalIF":4.3,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Intrinsic mechanism of scale-up effects in supercritical water fluidized bed reactors from particle perspective 超临界水流化床反应器放大效应的内在机理

IF 4.3 2区材料科学

Particuology Pub Date : 2025-07-18 DOI: 10.1016/j.partic.2025.07.011

Haozhe Su, Hui Jin, Chuan Zhang, Liejin Guo

{"title":"Intrinsic mechanism of scale-up effects in supercritical water fluidized bed reactors from particle perspective","authors":"Haozhe Su, Hui Jin, Chuan Zhang, Liejin Guo","doi":"10.1016/j.partic.2025.07.011","DOIUrl":"10.1016/j.partic.2025.07.011","url":null,"abstract":"<div><div>Supercritical water gasification is a promising method for efficient hydrogen production. Among various reactor designs, fluidized bed reactors demonstrate strong industrial potential due to their plugging resistance and favorable hydrodynamic properties. However, scaling up the reactor to industrial applications disrupts the mass transfer-reaction matching relationship established at the particle level, making it challenging to replicate the performance of smaller reactors. To mitigate the scale-up effect of the reactor, a fundamental understanding of particle-scale mechanisms is essential. In this study, high-resolution numerical simulations are employed to investigate particle dynamics across both reactor and particle scales. To enhance computational efficiency, adaptive mesh refinement and heterogeneous computing are utilized. The scale-up laws governing the internal flow structures and chemical reaction performance within the reactor are analyzed. The temperature, diffusion, and chemical reaction performance at the particle level are tracked, and statistical analyses are performed to elucidate the mechanisms driving the scale-up effects. Results reveal that the two scaling approaches affect reactor performance through different mechanisms. Radial scaling has minimal impact on particle mixing and reaction rates, whereas axial scaling reduces particle reaction rates; however, this reduction is compensated by an increased particle count, ultimately enhancing overall hydrogen yield. Additionally, higher superficial velocity enhances feedstock mixing and thermal uniformity, resulting in more uniform particle reactions, although it may hinder homogeneous reactions. These findings offer new insights into reactor scale-up effects and hold promise for guiding optimal and detailed design of future industrial-scale reactors.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"105 ","pages":"Pages 1-14"},"PeriodicalIF":4.3,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144723241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of particle attrition breakage on force chain dynamics and energy distribution in energy storage fluidized beds under variable conditions 变工况下颗粒磨损破碎对储能流化床力链动力学和能量分布的影响

IF 4.1 2区材料科学

Particuology Pub Date : 2025-07-18 DOI: 10.1016/j.partic.2025.07.008

Xiang Li, Hongchuan Jiang, Cai Liang

{"title":"Influence of particle attrition breakage on force chain dynamics and energy distribution in energy storage fluidized beds under variable conditions","authors":"Xiang Li, Hongchuan Jiang, Cai Liang","doi":"10.1016/j.partic.2025.07.008","DOIUrl":"10.1016/j.partic.2025.07.008","url":null,"abstract":"<div><div>Due to advantages such as rapid heat transfer and thorough mixing, fluidized bed reactors have become highly efficient systems for energy storage processes. However, under high temperatures and reactive conditions, severe particle attrition alters both the temperature response characteristics of the bed material and the gas–solid fluidization behavior, which impacts energy storage cycles. This study simulates the multi-field coupling characteristics of an energy storage fluidized bed reactor under attrition conditions, analyzing particle force chains, individual particle reactions, heat transfer, and the effects of operating parameters on energy distribution. The results indicate that particle attrition generates small particles within the bed, leading to uneven temperature and chemical energy distribution. The force chain network becomes more complex yet weaker, reducing the bed's mechanical stability. Increased surface area from particle breakage enhances thermal exchange with the gas, causing an initial rise in reaction rate, which then decreases as local reactants are depleted. Operational parameters such as operating pressure, gas temperature, and inlet velocity significantly impact energy release. These findings provide a theoretical basis for the design and optimization of energy storage fluidized bed reactors.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"104 ","pages":"Pages 261-282"},"PeriodicalIF":4.1,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144714468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","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 particle surface modification on the onset of spouting in a rectangular spouted bed 颗粒表面改性对矩形喷床喷射开始的影响

IF 4.3 2区材料科学

Particuology Pub Date : 2025-07-17 DOI: 10.1016/j.partic.2025.06.016

Ritesh Raman , Nebha K. Chavda , Palash K. Mollick , Subhankar Manna , Aniruddha B. Pandit , Partha S. Goswami

{"title":"Effect of particle surface modification on the onset of spouting in a rectangular spouted bed","authors":"Ritesh Raman , Nebha K. Chavda , Palash K. Mollick , Subhankar Manna , Aniruddha B. Pandit , Partha S. Goswami","doi":"10.1016/j.partic.2025.06.016","DOIUrl":"10.1016/j.partic.2025.06.016","url":null,"abstract":"<div><div>Experiments were conducted in a rectangular spouted bed to study the effect of surface modification of the particles on the gas-solid hydrodynamics. The surface was modified by doing coating the particles with acrylic paint. A completely different solid flow pattern was observed at the onset of spouting when coated particles were used. Instead of forming a cavity at the gas entry nozzle, particles from the top of the bed were fluidized at a particular gas flow rate, and a crack propagated downwards. After that, a big gas bubble formed at the bottom, which subsequently underwent bursting with the release of pressure. We report such hitherto unknown phenomena for a shallow granular bed for the first time. Instantaneous particle dynamics have been characterized using high-speed imaging. It is deduced that the cohesiveness of coated particles is the controlling parameter for this anomalous spouting behavior. Peak pressure drop and the corresponding superficial gas velocity for coated glass beads are more significant than uncoated particles for the same static bed height. A homogenous mixture of uncoated and coated glass beads exhibited bed characteristics as that of pure coated particles if the volume fraction of coated particles is greater than 20 %.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"105 ","pages":"Pages 22-35"},"PeriodicalIF":4.3,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144723243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Systematic numerical study of cuttings transport using drilling fluids modified with single-walled carbon nanotubes 单壁碳纳米管改性钻井液对岩屑运移的系统数值研究

IF 4.1 2区材料科学

Particuology Pub Date : 2025-07-17 DOI: 10.1016/j.partic.2025.07.001

A.V. Shebelev , A.V. Minakov , A.A. Gavrilov

{"title":"Systematic numerical study of cuttings transport using drilling fluids modified with single-walled carbon nanotubes","authors":"A.V. Shebelev , A.V. Minakov , A.A. Gavrilov","doi":"10.1016/j.partic.2025.07.001","DOIUrl":"10.1016/j.partic.2025.07.001","url":null,"abstract":"<div><div>A systematic numerical investigation of slurry transport by drilling fluids modified with single-walled carbon nanotube (SWCNT) additives under laminar flow conditions of the suspension has been conducted. Across wide-ranging parameter variations corresponding to real wells and drilling modes, the effects of the mass flow rate of the drilling fluid, particle size of the slurry, ratio of inner to outer pipe diameters, eccentricity, rotational speed of the inner pipe, and well inclination angle on the efficiency of slurry particle transport by the modified fluids were examined. The influence of the additives on the concentration distribution of slurry particles and the velocity of the mixture in the annular channel, simulating the well, was studied. Mechanisms of the nanotubes' influence on slurry particle transport were identified. It was demonstrated that for all considered cases, the efficiency of particle transport by drilling fluids modified with nanotubes significantly increases with increasing additive concentration. The greatest effectiveness for improving wellbore cleaning was exhibited by a drilling fluid with an SWCNT concentration of 0.1 wt%. For this fluid, the ability to transport slurry increased by a factor of 3.4, while the pressure drop increased only by a factor of 1.8 compared to the baseline fluid. Furthermore, the addition of nanotubes was found to be most effective for horizontal wells with concentric pipe placement, at low rotational speeds of the drill pipe, and at high mass flow rates of the drilling fluid.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"104 ","pages":"Pages 229-244"},"PeriodicalIF":4.1,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144695072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermodynamic and experimental investigation of critical factors influencing the combustion characteristics of aluminum particles 影响铝颗粒燃烧特性关键因素的热力学和实验研究

IF 4.1 2区材料科学

Particuology Pub Date : 2025-07-17 DOI: 10.1016/j.partic.2025.07.009

Xueqin Liao , Haiou Wang , Peihui Xu , Jianzhong Liu , Jianren Fan

{"title":"Thermodynamic and experimental investigation of critical factors influencing the combustion characteristics of aluminum particles","authors":"Xueqin Liao , Haiou Wang , Peihui Xu , Jianzhong Liu , Jianren Fan","doi":"10.1016/j.partic.2025.07.009","DOIUrl":"10.1016/j.partic.2025.07.009","url":null,"abstract":"<div><div>Although aluminum (Al) particles have been widely applied in aerospace and missile technologies, the critical factors influencing their combustion remain insufficiently studied. To address this, this work investigates the effects of multiple factors on Al particle combustion through thermodynamic theoretical calculations and experimental approaches. Thermodynamic results indicate that various oxidizing gases can chemically react with Al and release heat. Among them, the reaction between Al and oxygen exhibits the largest enthalpy change and Gibbs free energy change. In both Al/O and Al/O/C/H systems, increasing temperature reduces enthalpy change but enhances Gibbs free energy change. Pressure shows negligible effects on the system, while the influence of Al molar quantity depends on oxygen atom availability. Thermal analysis reveals that smaller particle sizes significantly increase oxidation rates. Moreover, Al particles with different particle sizes can continue to react until complete oxidation at a constant temperature of 1400 °C in air, suggesting that the alumina shell at high temperatures may be loose and porous with a non-dense structure. Combustion tests demonstrate that reducing particle size from 25 μm to 0.1 μm decreases ignition delay time by 86 % and increases combustion temperature by 30 %. Similarly, elevating oxygen concentration or pressure reduces ignition delay, enhances combustion temperature, and improves combustion efficiency. This study provides fundamental data support for constructing Al particle combustion models under complex variable environments.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"104 ","pages":"Pages 217-228"},"PeriodicalIF":4.1,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144695071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Molecular-scale adsorption mechanisms and mechanical stability of sepiolite for Li+, Na+ and K+ storage: Insights from molecular dynamics simulations 海泡石对Li+， Na+和K+储存的分子尺度吸附机制和机械稳定性：来自分子动力学模拟的见解

IF 4.3 2区材料科学

Particuology Pub Date : 2025-07-17 DOI: 10.1016/j.partic.2025.07.010

Hongqing Wei , Lijun Hu , Zuozhang Wang , Yanhuai Ding , Ana C.S. Alcântara

{"title":"Molecular-scale adsorption mechanisms and mechanical stability of sepiolite for Li+, Na+ and K+ storage: Insights from molecular dynamics simulations","authors":"Hongqing Wei , Lijun Hu , Zuozhang Wang , Yanhuai Ding , Ana C.S. Alcântara","doi":"10.1016/j.partic.2025.07.010","DOIUrl":"10.1016/j.partic.2025.07.010","url":null,"abstract":"<div><div>Sepiolite, a hydrated magnesium silicate known for its fibrous structure, is extensively utilized in water treatment for its ability to adsorb a variety of metal ions. Despite its widespread utilization, the mechanical properties of sepiolite, which are crucial for its practical applications, have been largely overlooked. To address this gap, this paper employs molecular dynamics (MD) simulation to explore the mechanical characteristics of sepiolite, including structural parameters, bulk modulus, and Young's modulus. The research findings reveal that zeolitic water molecules contribute positively to enhancing the mechanical properties of sepiolite. As the number of zeolitic water molecules rises, the Young's modulus values in the x and y directions show a clear increasing trend. However, the quantity of zeolitic water molecules does not significantly affect the Young's modulus in the z direction or the Poisson's ratio. Additionally, the paper assesses the adsorption capacity of sepiolite for Li<sup>+</sup>, Na<sup>+</sup>, and K<sup>+</sup>. The results indicate that as ion concentration rises, the absolute number of ions adsorbed onto the surface increases, yet the corresponding adsorption percentage shows a notable decline. Based on the adsorption capacity, the ion selectivity order of sepiolite is determined to be: Na<sup>+</sup> > Li<sup>+</sup> > K<sup>+</sup>. The MD simulations elucidate the adsorption mechanism by which alkali metal ions interact with and adhere to the sepiolite surface.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"105 ","pages":"Pages 15-21"},"PeriodicalIF":4.3,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144723242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of spreader geometries on powder bed quality with rough substrate surfaces in laser powder bed fusion process 激光粉末床熔合过程中基材表面粗糙的扩散器几何形状对粉末床质量的影响

IF 4.3 2区材料科学

Particuology Pub Date : 2025-07-16 DOI: 10.1016/j.partic.2025.07.007

Yaping Wu , Fuzhong Chu , Chaocai Zhang , Hongyu Yan , Lin Wang , Zongyan Zhou

{"title":"Influence of spreader geometries on powder bed quality with rough substrate surfaces in laser powder bed fusion process","authors":"Yaping Wu , Fuzhong Chu , Chaocai Zhang , Hongyu Yan , Lin Wang , Zongyan Zhou","doi":"10.1016/j.partic.2025.07.007","DOIUrl":"10.1016/j.partic.2025.07.007","url":null,"abstract":"<div><div>The quality of parts manufactured by laser powder bed fusion is closely related to the uniformity and density of the powder bed. In this work, the discrete element method is used to simulate the powder spreading process by different spreader geometries with rough substrate surfaces. The results indicate that reducing the spreader inclination angle significantly increases the number of force chains, enhances compaction, and consequently improves the quality of the powder bed. Studies also show that optimizing the bottom structure of the spreader can effectively reduce exposed areas. An arc-shaped structure promotes particle packing and filling, improving the powder distribution characteristics. A narrow spreader significantly affects the packing density of the powder bed at low layer gaps, whereas a wide spreader is relatively less constrained. At high spreading speeds, the spreader with an inclination angle of 135° produces the highest quality of the powder bed. R1000 performs excellently at larger layer gaps. The above findings provide valuable guidance for optimizing powder spreading strategies in the laser powder bed fusion process.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"104 ","pages":"Pages 289-301"},"PeriodicalIF":4.3,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research status and carbon reduction analysis of red mud in the field of building materials 赤泥在建材领域的研究现状及减碳分析

IF 4.3 2区材料科学

Particuology Pub Date : 2025-07-16 DOI: 10.1016/j.partic.2025.07.004

Duo Wu , Haoze Zhang , You Cheng , Pengjun Yu , Tao Fu

{"title":"Research status and carbon reduction analysis of red mud in the field of building materials","authors":"Duo Wu , Haoze Zhang , You Cheng , Pengjun Yu , Tao Fu","doi":"10.1016/j.partic.2025.07.004","DOIUrl":"10.1016/j.partic.2025.07.004","url":null,"abstract":"<div><div>Red mud, a highly alkaline industrial solid waste generated during the production of alumina, is characterized by its fine particle size and residual heavy metals. Its massive accumulation poses a serious threat to the environment and ecosystems. This paper provided a systematic review of the current research on red mud in building materials and its potential for carbon reduction. It examined the physicochemical properties of red mud and its applications in cement-based materials, road construction, building blocks, ceramics, and composite materials. Researches indicated that utilizing red mud in building materials could significantly increase its utilization while simultaneously reducing carbon emissions during production. For instance, red mud can be employed in the production of low-clinker composite cement, used to improve the water damage resistance of asphalt mixtures, and integrated to enhance the mechanical properties and durability of unfired bricks and ceramic products. Moreover, its carbon sequestration capacity offered substantial support for developing carbon-reducing building materials. Nonetheless, the large-scale application of red mud remains constrained by critical technical challenges, including high pre-treatment costs, limited performance optimization, and insufficient environmental safety assessments. This paper outlined future research directions and proposes strategies to promote the extensive utilization of red mud for carbon reduction, thereby providing a theoretical framework and technical support for the green transformation of the aluminum industry.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"104 ","pages":"Pages 313-331"},"PeriodicalIF":4.3,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0