Powder Technology最新文献_第3页

On the defect formation during laser powder bed fusion of high-fraction SiC particle reinforced AlMgScZr composites 高分数SiC颗粒增强AlMgScZr复合材料激光粉末床熔合过程中缺陷的形成

IF 4.6 2区工程技术

Powder Technology Pub Date : 2025-10-08 DOI: 10.1016/j.powtec.2025.121740

Long Geng , Xuntao Xiong , Yongxia Wang , Zhe Feng , Yuguang Chen , Wei Fan , Hua Tan , Fengying Zhang , Xin Lin

{"title":"On the defect formation during laser powder bed fusion of high-fraction SiC particle reinforced AlMgScZr composites","authors":"Long Geng , Xuntao Xiong , Yongxia Wang , Zhe Feng , Yuguang Chen , Wei Fan , Hua Tan , Fengying Zhang , Xin Lin","doi":"10.1016/j.powtec.2025.121740","DOIUrl":"10.1016/j.powtec.2025.121740","url":null,"abstract":"<div><div>Laser powder bed fusion (LPBF) of SiC particle-reinforced aluminum matrix composites (PAMCs) is extensively utilized in aerospace and electronic device fields. High-fraction SiC-PAMCs exhibit superior intrinsic properties, but their mechanical performance is significantly compromised by defect formation. This study investigates the effect of SiC on the powder spreading behavior, melt pool characteristics, and defect formation during the LPBF of SiC/AlMgScZr composites. The results reveal a strong negative correlation exists between SiC fraction and the achievable relative density of the composites. Specifically, low-fraction SiC-PAMCs (≤2 wt%) achieve excellent powder bed homogeneity and melt pool stability, achieving relative density exceeding 98 %. In contrast, increasing the SiC fraction to 10 wt% induces severe powder agglomeration, which promotes the formation of lack-of-fusion defects and significantly reduces the relative density. This phenomenon originates from two aspects: powder spreading and fusion. The interplay between recoater blade-pushing force, interparticle cohesion, and friction, creating alternating agglomeration and cavity zones in powder bed. During laser processing, unmelted powder and SiC particle agglomerates are present within the agglomeration zones. While elevated laser power partially penetrates agglomerates, it cannot fully counteract agglomeration-induced defects. The critical fraction of SiC is 7.17 wt% under an acceptable relative density of 98 %. To break through the critical value, we recommend changes in powder mixing techniques, powder spreading strategies, and fabrication approaches. Within the current framework, this study provides qualitative guidance for practical production and establishes the foundation for further optimization of process parameters and composite design in LPBF-fabricated high-fraction PAMCs.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"469 ","pages":"Article 121740"},"PeriodicalIF":4.6,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of Sn20Bi-xNi solder balls by pulsated orifice ejection method and their micro joint properties 脉动孔喷射法制备Sn20Bi-xNi钎料球及其微接头性能

IF 4.6 2区工程技术

Powder Technology Pub Date : 2025-10-08 DOI: 10.1016/j.powtec.2025.121743

Wei Dong, Jingyi Xu, Fumin Xu

{"title":"Preparation of Sn20Bi-xNi solder balls by pulsated orifice ejection method and their micro joint properties","authors":"Wei Dong, Jingyi Xu, Fumin Xu","doi":"10.1016/j.powtec.2025.121743","DOIUrl":"10.1016/j.powtec.2025.121743","url":null,"abstract":"<div><div>Sn-Bi based alloys represent ideal lead-free substitutes for conventional Sn-Pb solders due to their excellent soldering characteristics and potential cost advantages, particularly in high-density packaging applications. In this study, 250 μm diameter Sn20Bi-xNi (x = 0, 0.4, 0.8 wt%) BGA solder balls were successfully fabricated using the pulsated orifice ejection method (POEM). The combination of rapid cooling (10<sup>4</sup> K/s) and Ni microalloying effectively mitigated Bi segregation, yielding solder balls with excellent sphericity, narrow particle size distribution (standard deviation <1.8 μm), and uniformly refined microstructure. Cooling rate significantly influenced surface morphology: dendritic structures formed at 10<sup>3</sup> K/s, while cellular/equiaxed crystals develop at 10<sup>4</sup> K/s. Ni addition suppressed dendritic growth, and smooth, non-segregated surfaces were achieved through the synergistic rapid He gas cooling. The developed solder system exhibited exceptional performance: minimum melting range of 14.4 °C, significantly enhanced wettability (contact angles as low as 22°), reduced intermetallic compound (IMC) thickness (1.20 μm), and shear strength up to 60.1 MPa. These high-performance POEM-prepared solder balls demonstrate significant application potential in BGA packaging, offering distinct implementation advantages.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"469 ","pages":"Article 121743"},"PeriodicalIF":4.6,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation on the kinetics of hematite reduction reaction under different atmosphere systems in the process of hydrogen-based mineral phase transformation 氢基矿物相变过程中不同气氛体系下赤铁矿还原反应动力学研究

IF 4.6 2区工程技术

Powder Technology Pub Date : 2025-10-08 DOI: 10.1016/j.powtec.2025.121741

Cheng Huang , Shuai Yuan , Xinyu Li , Guodong Wen , Qinglong Fan

{"title":"Investigation on the kinetics of hematite reduction reaction under different atmosphere systems in the process of hydrogen-based mineral phase transformation","authors":"Cheng Huang , Shuai Yuan , Xinyu Li , Guodong Wen , Qinglong Fan","doi":"10.1016/j.powtec.2025.121741","DOIUrl":"10.1016/j.powtec.2025.121741","url":null,"abstract":"<div><div>Mineral phase transformation technology is an effective method for utilizing refractory iron ores. However, traditional CO-based processes generate significant CO<sub>2</sub> emissions, conflicting with the steel industry's low-carbon goals. Using H<sub>2</sub> and NH<sub>3</sub> as reducing agents offers a promising, carbon-free alternative, but studies on hematite reduction kinetics in different atmospheres remain limited. This study compares the hematite reduction kinetics in H<sub>2</sub>, NH<sub>3</sub>, and CO, utilizing XRD, SEM and BET to investigate phase transformation and microstructural evolution. Results show that reduction in H<sub>2</sub> and NH<sub>3</sub> follows the 3D diffusion model, with activation energies of 35.82 kJ·mol<sup>−1</sup> (H<sub>2</sub>) and 100.69 kJ·mol<sup>−1</sup> (NH<sub>3</sub>), respectively. In CO, the reaction follows the Avrami-Erofeev model with an activation energy of 18.97 kJ·mol<sup>−1</sup>. The reduction rate is highest in H<sub>2</sub>, with the largest specific surface area and pore volume of the product, followed by CO. H<sub>2</sub> and NH<sub>3</sub> can effectively reduce hematite, offering environmental advantages over CO.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"469 ","pages":"Article 121741"},"PeriodicalIF":4.6,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient combustion of low concentration methane over perovskite/BN-La: Enhanced catalytic performance and fundamental kinetic analysis 低浓度甲烷在钙钛矿/BN-La上的高效燃烧：增强的催化性能和基本动力学分析

IF 4.6 2区工程技术

Powder Technology Pub Date : 2025-10-08 DOI: 10.1016/j.powtec.2025.121742

Qiang Ni , Aikun Tang , Lu Xiao , Tao Cai , Leiqi Yang

{"title":"Efficient combustion of low concentration methane over perovskite/BN-La: Enhanced catalytic performance and fundamental kinetic analysis","authors":"Qiang Ni , Aikun Tang , Lu Xiao , Tao Cai , Leiqi Yang","doi":"10.1016/j.powtec.2025.121742","DOIUrl":"10.1016/j.powtec.2025.121742","url":null,"abstract":"<div><div>Catalytic combustion is an efficient method for removing low concentration methane from exhaust gases, with the key challenge being the development of highly effective catalysts. This study develops a composite powder perovskite MFC/BN using BN as a high thermal conductivity carrier and La as an additive for efficient methane combustion. This catalyst can achieve complete methane combustion at 455.7 °C, and run efficiently for over 25 h at 800 °C (methane conversion rate > 97 %). The structural and chemical characterizations (XRD, BET, SEM, and XPS) reveal an increased specific surface area (28.8 m<sup>2</sup>/g) and Mn<sup>4+</sup> species (46.31 %). The excellent thermal conductivity of BN carrier improves heat transfer while reducing catalyst aging and sintering, and its interaction with MFC decreases perovskite grain size and increases the specific surface area. La can induce the formation of more Mn<sup>4+</sup>, Fe<sup>3+</sup> and O<sub>lat</sub> species on the surface. Then, kinetic analysis demonstrates the pre-exponential factor (1.42 × 10<sup>9</sup> mol·g<sup>−1</sup>·s<sup>−1</sup>·kPa<sup>−1</sup>) and reaction activation energy (73.6 kJ/mol) in the reaction with a power function, and clarifies the relationship between the reactant and the catalyst surface. The mechanism shows that methane dehydrogenation and oxidation are rate-controlling steps, with BN and La facilitating CH<sub>4</sub> dehydrogenation to form CH<sub>3</sub>, CH<sub>2</sub>, and CHO intermediates.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"469 ","pages":"Article 121742"},"PeriodicalIF":4.6,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental and theoretical quantification of in-situ crushing characteristics of irregularly-shaped particles under multi-axis pressure with X-ray micro-computed tomography (μCT) and discrete element method (DEM) 基于x射线微计算机断层扫描（μCT）和离散元法（DEM）的多轴压力下不规则颗粒原位破碎特性实验与理论量化

IF 4.6 2区工程技术

Powder Technology Pub Date : 2025-10-07 DOI: 10.1016/j.powtec.2025.121733

Xiangyu Wang , Daoyong Yang , Chenwei Liu , Mingzhong Li

{"title":"Experimental and theoretical quantification of in-situ crushing characteristics of irregularly-shaped particles under multi-axis pressure with X-ray micro-computed tomography (μCT) and discrete element method (DEM)","authors":"Xiangyu Wang , Daoyong Yang , Chenwei Liu , Mingzhong Li","doi":"10.1016/j.powtec.2025.121733","DOIUrl":"10.1016/j.powtec.2025.121733","url":null,"abstract":"<div><div>In this study, an integrated and robust framework has been developed to experimentally and theoretically quantify the in-situ crushing characteristics of irregularly-shaped particles under reservoir conditions. Experimentally, a multi-axis pressure loading system was customized to evaluate the in-situ crushing behaviour of packed proppants utilizing the X-ray micro-computed tomography (μCT) analysis. Based on the reconstructed CT images, the particle crushing behaviour was evaluated and analyzed, and its key parameters (e.g., failure modes, particle size distribution (PSD), and mean coordination number (CN)) were quantitatively determined. Based on force chain and fracture propagation dynamics, theoretically, the discrete element method (DEM) has been employed to generate irregularly-shaped particles and thus confirm their morphologies of the reconstructed images so as to determine the simulation parameters. Particle failure modes are found to be influenced by both particle morphology and pressure loading conditions. Stress propagates along the force chains and then extends in chain-like or networked patterns. Along these paths, the principal stress directions of individual proppants vary, resulting in diverse failure modes. The crushing process transitions from a dynamic state to a steady one, during which sub-particles generated from crushed particles are compacted under the applied load and fill the entire pore spaces. Such compaction increases the overall average CN, while higher CNs are less likely to crush the larger particles in a given system. With lateral confining stress, the internal force chain network of the packed proppants is found to be more homogeneous, leading to the strain hardening effect and significant improvement of the compressive strength.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"469 ","pages":"Article 121733"},"PeriodicalIF":4.6,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Controlled fabrication of spherical HNS with Micro/Nano secondary structure for performance augmentation 微纳二级结构球形HNS的性能增强控制制备

IF 4.6 2区工程技术

Powder Technology Pub Date : 2025-10-07 DOI: 10.1016/j.powtec.2025.121737

Zheng Li, Bao Zhang, Min Yang, Ruixing Liu, Qian Wang, Xingquan Zhang, Changping Guo

{"title":"Controlled fabrication of spherical HNS with Micro/Nano secondary structure for performance augmentation","authors":"Zheng Li, Bao Zhang, Min Yang, Ruixing Liu, Qian Wang, Xingquan Zhang, Changping Guo","doi":"10.1016/j.powtec.2025.121737","DOIUrl":"10.1016/j.powtec.2025.121737","url":null,"abstract":"<div><div>Spherical energetic materials with micro-nano secondary structure have broad application prospects in the fields of aerospace, defense and military. In this paper, spherical HNS with micro-nano secondary structure was prepared by oil-in-oil emulsion method with Tween-80 as surfactant, dimethyl sulfoxide (DMSO) as solvent oil phase and cyclohexane as non-solvent oil phase. The effects of surfactant type and concentration, solvent-nonsolvent ratio and emulsion standing time on emulsion stability were investigated. The morphology, crystal structure and thermal decomposition properties of spherical HNS were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TG). The combustion performance, mechanical sensitivity and short pulse initiation performance of raw HNS and spherical HNS were tested and compared. The results showed that spherical HNS with uniform particle size and good dispersion could be obtained when Tween-80 was used as surfactant, the concentration was 5 g·L<sup>−1</sup>, the volume ratio of solvent to non-solvent was 3:3, and the standing time was less than 30 min.Compared with the raw materials, the thermal decomposition peak temperature of spherical HNS was 15.5 °C earlier, and the combustion performance was improved. The specific surface area of spherical HNS was expanded by 15 times, showing good insensitive effect and excellent short pulse detonation performance.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"469 ","pages":"Article 121737"},"PeriodicalIF":4.6,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aluminium dust explosion suppression by KHCO3 and K2CO3: The influence of the inhibitor's particle size and thermochemical synergy KHCO3和K2CO3抑制铝粉尘爆炸：抑制剂粒度和热化学协同作用的影响

IF 4.6 2区工程技术

Powder Technology Pub Date : 2025-10-07 DOI: 10.1016/j.powtec.2025.121732

Jianxu Ding , Yufang Chen , Xingjun Wu , Maodong Li , Xiangbao Meng , Zhiyue Han , Shihang Li , Runzhi Li , Chuyuan Huang

{"title":"Aluminium dust explosion suppression by KHCO3 and K2CO3: The influence of the inhibitor's particle size and thermochemical synergy","authors":"Jianxu Ding , Yufang Chen , Xingjun Wu , Maodong Li , Xiangbao Meng , Zhiyue Han , Shihang Li , Runzhi Li , Chuyuan Huang","doi":"10.1016/j.powtec.2025.121732","DOIUrl":"10.1016/j.powtec.2025.121732","url":null,"abstract":"<div><div>This study investigated the effects of potassium carbonate salts (KHCO<sub>3</sub> and K<sub>2</sub>CO<sub>3</sub>) on the suppression of aluminium dust explosions. The inhibitor variables mainly include the particle size, the inerting ratio, and the mixing strategy. Experiments in a 20 L spherical explosion system revealed that the maximum explosion pressure (<em>P</em><sub>max</sub>) decreased significantly with increasing inerting ratios or with decreasing inhibitor particle sizes. Adding KHCO<sub>3</sub> reduced <em>P</em><sub>max</sub> more effectively than adding K<sub>2</sub>CO<sub>3,</sub> which achieved near extinction at 70 wt%. Compared with KHCO<sub>3</sub>, a 7:3 KHCO<sub>3</sub>/K<sub>2</sub>CO<sub>3</sub> mixture at 60 wt% lowered <em>P</em><sub>max</sub> by 23 %. Thermal characteristic analyses, explosion residue analyses, and numerical modelling analyses indicated that the two inhibitors had different methods for reducing the aluminium explosion pressure. KHCO<sub>3</sub> primarily acted in the early stage of the aluminium explosion, whereas K<sub>2</sub>CO<sub>3</sub> chemically participated in oxygen radical competition. The synergistic effects of the two inhibitor mixtures were clarified. These findings highlight the critical role of optimising the particle size, inerting ratios, and hybrid formulations to maximise the suppression efficiency and economic viability.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"469 ","pages":"Article 121732"},"PeriodicalIF":4.6,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Non-local updated Lagrangian peridynamics model for granular flow with μ(I) rheology 具有μ(I)流变的颗粒流动非局部更新拉格朗日动力学模型

IF 4.6 2区工程技术

Powder Technology Pub Date : 2025-10-06 DOI: 10.1016/j.powtec.2025.121736

Changyun Yin , Jianbo Fei , Zhihao Liu , Zhankui Liu , Yuxin Jie

{"title":"Non-local updated Lagrangian peridynamics model for granular flow with μ(I) rheology","authors":"Changyun Yin , Jianbo Fei , Zhihao Liu , Zhankui Liu , Yuxin Jie","doi":"10.1016/j.powtec.2025.121736","DOIUrl":"10.1016/j.powtec.2025.121736","url":null,"abstract":"<div><div>Granular materials exhibit complex behaviors in different flow states that feature nonlocality. In this study, we propose a non-local updated Lagrangian peridynamics model for granular flow. The model treats the granular flow as a weakly compressible fluid, governed by the framework of Navier–Stokes equation and incorporating the <em>μ</em>(<em>I</em>) rheology. The introduction of peridynamics with the Wendland C<sup>2</sup> kernel function enables this nonlocal feature. The proposed model is implemented to simulate granular collapse processes. Simulated flow velocities and deposition configurations are compared with experimental observations. It is the found that the proposed peridynamics method naturally includes non-local effects through considering the non-contact interaction between material points in the peridynamics horizon, specifically, slower static-to-flowing transitions and wider shear bands can be captured compared with the local model. Sensitive analysis indicates that increasing the peridynamic horizon enhance stress redistribution, widen shear band, and extend runout. In addition, the influence of the compressibility of granular properties and the adopted kernel functions is further investigated. In general, the updated Lagrangian nonlocal peridynamics model can reproduce simultaneously the behaviors exhibited by granular materials, especially in the quasi-static regime.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"469 ","pages":"Article 121736"},"PeriodicalIF":4.6,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of weighted-sum-of-gray-gases models for gas-ash particle mixture in ash deposition 灰沉积中气体-灰颗粒混合物的灰色气体加权和模型的评价

IF 4.6 2区工程技术

Powder Technology Pub Date : 2025-10-06 DOI: 10.1016/j.powtec.2025.121731

Ran An, Xiaobing Zhang

{"title":"Assessment of weighted-sum-of-gray-gases models for gas-ash particle mixture in ash deposition","authors":"Ran An, Xiaobing Zhang","doi":"10.1016/j.powtec.2025.121731","DOIUrl":"10.1016/j.powtec.2025.121731","url":null,"abstract":"<div><div>The deposition layer formed by combustion products on the heat exchange surface reduces the operation efficiency. It is an urgent problem that needs to be solved to reduce unnecessary energy consumption. The comprehensive gas-ash particle dynamic deposition model developed by different radiation models is evaluated, and the radiation characteristics of gas and particles and the effects on deposition are revealed. The radiation transfer equation is solved by the discrete ordinate model, and the coupling of sub-models in the deposition model CFD framework is realized by user defined functions. Different forms of the weighted-sum-of-gray-gases model are integrated into the verified deposition model. In addition, the influence of operation conditions including absorbing gas content, pressure, temperature, and wall emissivity on the non-gray radiation characteristics of the gas is analyzed, and the contribution of particle radiation to the overall radiation at different volume fractions is considered. The results show that under oxy-fuel conditions, the growth amplitude of radiation source term gradually decreases with the increase of gas concentration because the sensitivity of radiation capacity to concentration is weakened at high concentrations. Pressure and temperature affect the radiation characteristics and spectral radiation intensity of the gas respectively, and the latter is more drastic than the former. In addition, with the increase of particle volume fraction, particle radiation dominates the overall radiation. Among the radiation models considered in the dynamic deposition model, the gas mixture model/particle gray model and gray gas model/particle non-gray model perform well. The results can provide practical guidance for the optimization of thermal equipment operation and soot-blowing schemes.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"469 ","pages":"Article 121731"},"PeriodicalIF":4.6,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CFD-DEM investigation of the flow and heat transfer characteristic of copper slag and biomass particles in a coupled waste heat utilization system 废热耦合利用系统中铜渣与生物质颗粒流动及传热特性的CFD-DEM研究

IF 4.6 2区工程技术

Powder Technology Pub Date : 2025-10-06 DOI: 10.1016/j.powtec.2025.121713

Chaowei Ma , Jianhang Hu , Hua Wang , Cheng Tan , Yong Yu

{"title":"CFD-DEM investigation of the flow and heat transfer characteristic of copper slag and biomass particles in a coupled waste heat utilization system","authors":"Chaowei Ma , Jianhang Hu , Hua Wang , Cheng Tan , Yong Yu","doi":"10.1016/j.powtec.2025.121713","DOIUrl":"10.1016/j.powtec.2025.121713","url":null,"abstract":"<div><div>As a high-energy-consuming sector, the metallurgical industry possesses substantial untapped waste heat resources, with efficient recovery of slag heat emerging as a critical challenge. To address the limitations of conventional recovery technologies, this study proposes an innovative approach that integrates biomass thermochemical conversion with metallurgical slag heat recovery, resulting in a novel coupled waste heat utilization system. A three-dimensional rotary reactor model was created using a coupled CFD-DEM, incorporating the dense discrete phase model (DDPM) to numerically analyze the multiphase flow and heat transfer interactions between hot copper slag (CS) and biomass particles (WTS). The results demonstrate that increasing CS loading enhances particle mixing, elevates average rolling velocity, and improves thermal contact between WTS and CS, thereby accelerating heat transfer. The particle bed exhibits a typical rolling flow regime with distinct active (near-wall) and passive (core) zones. Notably, a 20 % CS loading produces the highest and most uniform temperature distribution, while even a 5 % loading significantly improves heating performance. Particle trajectory analysis reveals strong radial segregation driven by centrifugal and shear forces, which influences thermal conductivity. Across all cases, the mixing index remains below 0.2, indicating limited mixing due to disparities in particle size and density. Moreover, higher rotation speeds improve thermal uniformity, with 8 rpm identified as the optimal condition. CS enhances the gas phase's effective thermal conductivity, leading to a more uniform temperature distribution. These findings provide detailed insights into particle dynamics and heat transfer in rotary kilns, enhancing biomass conversion efficiency and industrial waste heat recovery.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"469 ","pages":"Article 121713"},"PeriodicalIF":4.6,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0