Particuology最新文献

{"title":"Micro-mechanical analysis on the spreading of tungsten powder in electron beam powder bed fusion additive manufacturing","authors":"Ju Wang ,&nbsp;Haiyang Zhao ,&nbsp;Zhe Liu ,&nbsp;Dengzhi Yao ,&nbsp;Meng Li ,&nbsp;Shujun Li ,&nbsp;Dechun Ren ,&nbsp;Jian Wang ,&nbsp;Xizhong An","doi":"10.1016/j.partic.2025.08.008","DOIUrl":"10.1016/j.partic.2025.08.008","url":null,"abstract":"<div><div>Electron beam powder bed fusion (EB-PBF) enables the additive manufacturing of high-melting-point, reactive metals like tungsten. However, the quality of the powder bed is governed by the micro-mechanics of powder spreading, which remain unclear. In this work, the spreading of tungsten powder during EB-PBF process was numerically reproduced by three-dimensional discrete element method. Micro-mechanics (particle motion behaviors, evolution of contact forces and formation of force arches) of the powder spreading were analyzed under varying operating parameters (spreading velocity (<em>V</em>), spreading height (<em>H</em>_set)) and particle size distribution (PSD). Additionally, powder bed density <em>ρ</em> and surface roughness <em>Ra</em> were also evaluated. Results indicate that low <em>H</em>_set facilitates the formation of short-length, stable force arches in front of the recoater, hindering powder fall onto the substrate. At low <em>V</em>, the force arches undergo partial collapse and are subsequently restored by surrounding particles, enabling high-frequency, small-quantity powder deposition, which results in higher <em>ρ</em> and lower <em>Ra</em>. Conversely, at high <em>V</em>, force arches collapse completely and require longer rebuilding periods, leading to periodic powder deposition and large voids in the powder bed. Increasing PSD standard deviation facilitates the stable force arches by large particles, permitting small particle percolation, which reduces <em>ρ</em> and <em>Ra.</em></div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"105 ","pages":"Pages 277-287"},"PeriodicalIF":4.3,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916307","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}

{"title":"Discrete simulations of combustion dynamics in coal particles: Insights into heat and mass transfer mechanisms","authors":"Li Dong ,&nbsp;Shanwei Hu ,&nbsp;Yufei Wang ,&nbsp;Xinhua Liu ,&nbsp;Wei Chen ,&nbsp;Ying Ren","doi":"10.1016/j.partic.2025.08.007","DOIUrl":"10.1016/j.partic.2025.08.007","url":null,"abstract":"<div><div>Coal remains a cornerstone of China's energy landscape, significantly contributing to primary energy production and consumption. This study investigates the combustion characteristics of coal particles using a discrete modeling approach to simulate the combustion behavior of single particles. The research reveals that larger particle sizes increase heat and mass transfer resistance, prolonging combustion duration, while higher ambient temperatures enhance convective heat transfer, accelerating combustion reactions. Additionally, the spatial distribution of inert cohesive beads significantly affects gas diffusion, with certain arrangements hindering gas release. The model is validated against current literature, demonstrating its capability to predict carbon conversion rates and combustion dynamics. These findings provide valuable insights into coal combustion mechanisms, offering a foundation for optimizing combustion processes and improving energy efficiency while addressing environmental concerns.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"105 ","pages":"Pages 217-228"},"PeriodicalIF":4.3,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144903913","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}

{"title":"Application of design of experiments for optimizing solvent ratios in ceritinib spherical crystallization","authors":"Iva Zokić ,&nbsp;Jasna Prlić Kardum ,&nbsp;Mirta Sabol ,&nbsp;Valentina Travančić","doi":"10.1016/j.partic.2025.08.009","DOIUrl":"10.1016/j.partic.2025.08.009","url":null,"abstract":"<div><div>The granulometric properties of active pharmaceutical ingredients (APIs) have significance in the pharmaceutical industry because they affect the handling of powders and thus the efficiency of their production. Ceritinib, an anaplastic lymphoma kinase inhibitor used in the treatment of non-small cell lung cancer, exhibits platy crystals, which results in low flowability and compressibility and negatively affects its production and pharmaceutical application. Spherical crystallization is a promising method for improving the granulometric properties of APIs by transforming unfavorable particle shapes into a more favorable spherical form.</div><div>The aim of this research was to improve the granulometric properties of ceritinib through a combined spherical crystallization method in a system containing tetrahydrofuran as the solvent, water with polyvinylpyrrolidone as the antisolvent, and heptane as the bridging liquid. Experimental design was employed to examine and mathematically describe the influence of the solvent fractions in the selected system on the roundness of the obtained crystals and consequently their compressibility. Spherical crystals of ceritinib with high roundness and improved compressibility compared to powdered ceritinib were obtained. The enhanced powder characteristics facilitate the optimization of the production process, potentially minimizing the necessary number of process steps and increasing efficiency.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"105 ","pages":"Pages 249-258"},"PeriodicalIF":4.3,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916435","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}

{"title":"Mixing performance for wet and sticky bulk materials in a vertical blender using DEM simulation","authors":"Jie Li ,&nbsp;Yuanqiang Tan ,&nbsp;Shiyan Yan ,&nbsp;Sunsheng Zhou ,&nbsp;Jiangtao Zhang","doi":"10.1016/j.partic.2025.08.004","DOIUrl":"10.1016/j.partic.2025.08.004","url":null,"abstract":"<div><div>Wet and sticky bulk materials exhibit poor flowability during the mixing process, which prevents adequate contact between dry and wet particles. This results in uneven moisture distribution and deterioration in the mixing system. To address these issues, the mixing process of viscous concrete was focused on a vertical blender. A comprehensive investigation into mixing mechanisms and particles flow patterns were conducted using the discrete element method (DEM). The accuracy of the contact parameters in DEM was calibrated through repose angle and validated by torques tested in a custom-built mixing platform. And then, the effects of moisture content, filling level, rotational speed, and inclined angle were systematically investigated with respect to key mixing metrics: the relative standard deviation (<em>RSD</em>), coordination number (<em>CN</em>), segregation index (<em>SI</em>) of wet particles, as well as liquid mass. The results indicated that when the moisture content is 8 %, filling level is 50 %, and rotational speed is more than 60 rpm, the <em>CN</em> and mixing efficiency are acceptable, and the <em>RSD</em> and <em>SI</em> are low, thereby improving the mixing quality. The convective motion was revealed as the dominant flow regime through statistical quantification of diffusion coefficients and Peclet numbers. Finally, Box-Behnken Design was employed to develop quadratic polynomial models for <em>RSD</em>, <em>CN</em>, and <em>SI</em>, which demonstrated strong accuracy in predicting mixing performance and enabled systematic optimization of critical process parameters.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"105 ","pages":"Pages 229-248"},"PeriodicalIF":4.3,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144911772","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}

{"title":"Unraveling multi-parameter coupling dynamics and building a machine learning-based predictive model for viscous dissipation rate in pin-type stirred mills","authors":"Shengdong Li ,&nbsp;Dexi Wang ,&nbsp;Honglei Yu ,&nbsp;Jinyuan Guo ,&nbsp;Gong Chen ,&nbsp;Lin Fan","doi":"10.1016/j.partic.2025.08.006","DOIUrl":"10.1016/j.partic.2025.08.006","url":null,"abstract":"<div><div>The rod and pin stirred mill is a key device for micron-sized powder production, yet the quantitative understanding of its grinding mechanism under multi-parameter coupling remains insufficient. This study develops a coupled flow field model based on computational fluid dynamic to investigate how agitator diameter, shaft diameter, and rotational speed influence viscous dissipation. Results reveal a positive correlation between these parameters and viscous dissipation rate, following a power-law relationship. Specifically, the agitator diameter shows a two-stage linear effect, while the shaft diameter exhibits Gaussian-type nonlinear growth. Numerical simulation combined with machine learning enables sensitivity analysis, indicating that rotational speed has the most significant impact, followed by shaft diameter and agitator diameter. The Gradient Boosting model demonstrates the highest prediction accuracy. These findings provide a quantitative basis for the engineering design of high-performance stirred mills.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"105 ","pages":"Pages 315-324"},"PeriodicalIF":4.3,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144931725","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}

{"title":"Two-dimensional ultrasonic vibration-assisted grind-polishing of MFC valve surface with an innovative SPPU tool","authors":"Jun Cheng,&nbsp;Zhaozhi Guo,&nbsp;Chuang Zhang,&nbsp;Jingyu Li,&nbsp;Kefeng Song","doi":"10.1016/j.partic.2025.08.005","DOIUrl":"10.1016/j.partic.2025.08.005","url":null,"abstract":"<div><div>Ultra-precision machining technology received relatively little attention in the machining of key components for semiconductor equipment, such as the seal surfaces of mass flow controller (MFC). The machining quality of these features is vital to the corrosion resistance of MFC valve body. Currently, the processing of these features still relies on conventional manual polishing, which will lead to uncertainty in surface quality. Therefore, this article employs a special fabricated sinter pouring polyurethane (SPPU) grind-polishing tool to conduct two-dimensional ultrasonic vibration-assisted polishing experiments, with a focus on the tool's performance. The machining mechanism of the tool was analyzed. Taking into account the ultrasonic cavitation effect, the penetration depth of a single grain was calculated, and established a surface roughness model. Through experiments, it was found that as the amplitude increased, the surface roughness showed a decreasing trend, reaching as low as 0.003 μm, but the change in polishing force exhibited an opposite trend. Additionally, the material removal efficiency significantly improves with the increase of amplitude. The processed surface had a reduced carbon content and no oxygen element, indicating the stable machining performance of the tool. This article provides effective reference for the automated processing of MFC valve body features.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"105 ","pages":"Pages 179-200"},"PeriodicalIF":4.3,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144886962","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}

{"title":"Random walk dispersion model for missile exhaust smoke particles based on geometric topology and wall constraint effects","authors":"Chenshuo Li,&nbsp;Debin Fu,&nbsp;Zhenyu Liu","doi":"10.1016/j.partic.2025.07.016","DOIUrl":"10.1016/j.partic.2025.07.016","url":null,"abstract":"<div><div>The dispersion of exhaust smoke particles generated during missile ignition is strongly affected by geometric confinement from launch platforms, leading to persistent smoke accumulation in the launch area, which poses significant challenges for visibility control and target detection. However, existing Random Walk Model (RWM) typically rely on simplified assumptions such as free-space domains or regular boundary geometries, limiting their applicability to complex wall-constrained scenarios. To fill this gap, a Geometric Topology and Wall-Constrained Random Walk Model (GTWC-RWM) is developed to simulate particle transport in complex launch-site environments. The model incorporates wall effects—including reflection, slip, and adsorption—through ray–triangle intersection methods for collision detection. Collision response parameters are expressed as second-order polynomials of incidence angle and calibrated using experimental data to ensure physical consistency. Validation against reference data and geometric obstacle scenarios confirms the model's predictive capability, yielding a maximum relative error of less than 26.16 %. Simulations reveal that wall-constrained effects significantly impede dispersion, with concentration gradients reaching up to 58.79 % between obstructed and unobstructed regions. A sensitivity analysis quantifies the influence of key parameters on near-wall concentration distributions.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"105 ","pages":"Pages 201-216"},"PeriodicalIF":4.3,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144895484","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}

{"title":"CFD-DEM modeling of fluid-driven fracture induced by temperature-dependent polymer injection","authors":"Daniyar Kazidenov ,&nbsp;Sagyn Omirbekov ,&nbsp;Yerlan Amanbek","doi":"10.1016/j.partic.2025.08.002","DOIUrl":"10.1016/j.partic.2025.08.002","url":null,"abstract":"<div><div>This study numerically investigates fracture initiation and propagation during polymer-based solution injection under varying thermal conditions. A coupled computational fluid dynamics and discrete element method (CFD-DEM) framework is used to model non-Newtonian fluid flow through a granular medium. The rheology of shear-thinning fluids and fluid-particle heat transfer are modeled with temperature-dependent power-law parameters. The current model is validated by comparing fracture propagation behavior and peak pressures against the similar numerical study. The adequacy of the fluid-particle heat transfer model is confirmed by comparing the results with an analytical approach. The simulation results show that polymer concentration significantly influences fracturing behavior. Less concentrated, lower-viscosity fluids are more likely to create linear fracture paths with enhanced fluid infiltration. In contrast, fluids with higher polymer concentrations and viscosities tend to produce wider fractures characterized by greater particle displacement. An increase in the fluid temperature injected into the cooler medium leads to a reduction of fracture size for the 0.4 % (w/w) XG solution, while the 0.6 % (w/w) XG solution tends to form more linear fracture tips. At sufficiently elevated medium temperatures, the injection of cooler fluids prevents fracture initiation for both concentrations. Lower-viscosity cases, dominated by infiltration, reflect broader thermal transitions in particle temperature distribution, whereas higher-viscosity cases, characterized by particle displacement, exhibit narrower transition regions along fracture boundaries. A fracture initiation criterion for shear-thinning fluids is proposed based on the dimensionless parameters Π₁ and <em>τ</em>₂. Fracture occurs when Π₁ &gt; 73 and <em>τ</em>₂ &gt; 3.58 × 10⁻⁹. The 0.4 % solution exhibits lower thermal sensitivity with relatively minimal variations in the dimensionless parameters, while the 0.6 % solution shows a greater response to temperature changes, reflected in broader variations of these parameters.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"105 ","pages":"Pages 259-276"},"PeriodicalIF":4.3,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916306","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}

{"title":"Effects of hydrogen injection on combustion behaviors of coal-coke-gas in a blast furnace raceway: A numerical study","authors":"Meng Li ,&nbsp;Deyu Yue ,&nbsp;Guanyin Wu ,&nbsp;Chao Li ,&nbsp;Zhong Li ,&nbsp;Xizhong An","doi":"10.1016/j.partic.2025.08.003","DOIUrl":"10.1016/j.partic.2025.08.003","url":null,"abstract":"<div><div>This study utilizes a three-dimensional Discrete Element Model-Computational Fluid Dynamics-Discrete Phase Model (DEM-CFD-DPM) to simulate the effects of hydrogen (H₂) injection on the combustion characteristics, coke/coal/gas thermo-chemical behaviors, and kinetics in a blast furnace (BF) raceway. The results indicate that the introduction of H₂ significantly reduces O₂ concentration and increases H₂ and H₂O concentrations in the raceway cavity. The mass fractions of reducing gas (including CO and H₂) at the tuyere tip and outlet increase. Due to the oxygen competition between H₂ and PC combustion, the time required for pulverized coal (PC) to reach a stable value of burnout is extended under H₂ injection. The burnout of PC with smaller particle size becomes a bit smaller when H₂ is injected, while the difference in burnout for PC with larger size is relatively smaller regardless of whether H₂ is injected. Additionally, the injection of H₂ not only reduces coke consumption but also provides additional thermal compensation for the raceway. Meanwhile, H₂ injection slightly reduces the raceway size and coke kinetic energies. These new findings provide theoretical insights for optimizing hydrogen-rich gas injection and the development of low-carbon ironmaking technology.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"105 ","pages":"Pages 165-178"},"PeriodicalIF":4.3,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144886961","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}

{"title":"New insights into enhancing sustainable flotation performance of fine chalcopyrite via surface modification","authors":"Gan Cheng ,&nbsp;Yujie Peng ,&nbsp;Lei Xiong ,&nbsp;Yang Lu ,&nbsp;Enze Li ,&nbsp;Jianming Gao ,&nbsp;Yonghong Qin ,&nbsp;Xin Wang ,&nbsp;Ee Von Lau","doi":"10.1016/j.partic.2025.08.001","DOIUrl":"10.1016/j.partic.2025.08.001","url":null,"abstract":"<div><div>Copper, a critical strategic metal primarily from chalcopyrite, is widely used. However, a large amount of chalcopyrite is not effectively recovered resulting from its surface characteristics due to its fine size. This study introduced the use of surface roughness (SR) as a core indicator to evaluate chalcopyrite's flotation performance. Two modification methods including mechanical activation (grinding) and nanoparticle collectors (NPCs) modification were systematically investigated. Grinding enhanced SR from 1.274 to 3.593, improved yield from 55.14 % to 63.21 %, and increased hydrophobicity, as demonstrated by the rise in contact angle from 55.74° to 68.38°. NPCs demonstrated superior performance, with SR reaching 4.987, contact angle up to 90.75°, and yield as high as 91.45 %. The results demonstrated that physical modification (grinding) improved flotability through roughness enhancement, while NPCs offered an optimal solution for chalcopyrite flotation by combining the advantages of increased SR with strong collector interaction. Molecular dynamics simulations revealed the following diffusion coefficient order: CTAB (cetyltrimethylammonium bromide)-NPC &gt; SDS (sodium dodecyl sulfate)-NPC &gt; PEG (polyethylene glycol)-NPC &gt; BX (butyl xanthate) &gt; no collector. This trend demonstrated that higher water molecule mobility corresponded to reduced surface-water binding and enhanced chalcopyrite hydrophobicity induced by collector adsorption. These findings provide valuable insights for optimizing copper mineral processing, particularly for fine chalcopyrite resources.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"105 ","pages":"Pages 155-164"},"PeriodicalIF":4.3,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144886960","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}