Powder Technology最新文献_第4页

Numerical simulation of polydisperse granular column collapse on an inclined erodible bed

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-20 DOI: 10.1016/j.powtec.2025.120942

Jingchang Zhang , Guibin Zhang , Hongjie Wen

{"title":"Numerical simulation of polydisperse granular column collapse on an inclined erodible bed","authors":"Jingchang Zhang , Guibin Zhang , Hongjie Wen","doi":"10.1016/j.powtec.2025.120942","DOIUrl":"10.1016/j.powtec.2025.120942","url":null,"abstract":"<div><div>Granular flow is extremely complex owing to the polydispersity of the sliding mass and the erodibility of the underlying bed. However, systematic studies addressing the polydisperse granular flow over an erodible bed remain scarce. Based on a well-validated quasi-three-dimensional Discrete Element Method (quasi-3D DEM), the collapse process of a polydisperse granular column on an inclined erodible bed is investigated in this study. The influences of granular column composition, bed erodibility and slope on the collapse process are analyzed. The results indicate that a stratification phenomenon occurs in the final collapse morphology due to the particle segregation effect. As the proportion of coarse particles in the granular column increases, both the erosion area and runout distance gradually decrease, while the separation degree between different particle phases increases. As bed particle size increases, erosion phenomena become more pronounced while the runout distance gradually diminishes. Moreover, an increase of bed slope results in the particles gaining more kinetic energy, thereby significantly increasing the erosion area and the runout distance. These insights deepen the understanding of granular flow dynamics.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120942"},"PeriodicalIF":4.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697994","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 numerical simulations on the deflagration of corn starch dust flames under the influence of pipeline inclination angles and dust cloud concentrations

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-20 DOI: 10.1016/j.powtec.2025.120946

Jinglin Zhang , Lianghui Guo , Zhenguo Du , Shikai Bao , Chang Li , Zhiyang Zhang , Gang Li , Chunmiao Yuan

{"title":"Experimental and numerical simulations on the deflagration of corn starch dust flames under the influence of pipeline inclination angles and dust cloud concentrations","authors":"Jinglin Zhang , Lianghui Guo , Zhenguo Du , Shikai Bao , Chang Li , Zhiyang Zhang , Gang Li , Chunmiao Yuan","doi":"10.1016/j.powtec.2025.120946","DOIUrl":"10.1016/j.powtec.2025.120946","url":null,"abstract":"<div><div>Pipeline systems, which are commonly seen in the processes of grain dust processing and transportation, are significant sources of dust explosion accidents. The influence of pipeline inclination angles and dust cloud concentrations within the pipeline on the combustion characteristics of corn starch dust clouds was explored using CFD simulation techniques and experiments. The results indicate that the increase in pipeline bending angles will impose a significant hindrance on the deflagration propagation of corn starch dust within the pipeline, which further impedes the release of explosives in the container. This, in turn, augments the turbulent kinetic energy in the container, leading to an increase in both the maximum flame spread velocity (MFSV) and average flame spread velocity (AFSV) within the pipeline. And such an increasing effect exists under any dust cloud concentrations. The flame propagation process obtained through numerical simulation is basically consistent with that of the experiment. Furthermore, under any condition of pipeline bending angles, with the increase in dust cloud concentration, the flame spread velocity (FSV) generally shows a propensity to first rising and then declining.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120946"},"PeriodicalIF":4.5,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705574","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

Hybrid reduction of iron ores by biomass and H2: Reduction thermodynamics and kinetics

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-19 DOI: 10.1016/j.powtec.2025.120953

Rongrong Wang , Alexander Babich , Dieter Senk , Min Wang

引用次数: 0

Effects of particle shape, breakage properties, and operating parameters on blast furnace raceway size through CFD-DEM simulations and cold-model experiments

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-19 DOI: 10.1016/j.powtec.2025.120952

Ying-Hsuan Ko , Jian-Shiang Chen , Yu-Cheng Hsiao , Hernan Felipe Puentes Cantor , Wei-Jie Chen , Jia-Wei Hung , Hao-Chuan Huang , Tsung-Yen Huang , Te-Cheng Su

{"title":"Effects of particle shape, breakage properties, and operating parameters on blast furnace raceway size through CFD-DEM simulations and cold-model experiments","authors":"Ying-Hsuan Ko , Jian-Shiang Chen , Yu-Cheng Hsiao , Hernan Felipe Puentes Cantor , Wei-Jie Chen , Jia-Wei Hung , Hao-Chuan Huang , Tsung-Yen Huang , Te-Cheng Su","doi":"10.1016/j.powtec.2025.120952","DOIUrl":"10.1016/j.powtec.2025.120952","url":null,"abstract":"<div><div>During ironmaking, high-speed air injected laterally from a tuyere forms a raceway cavity in a coke bed, and this cavity affects gas transport and efficiency. This study created a quasi-two-dimensional apparatus and a computational fluid dynamics (CFD)–discrete element method (DEM) model to investigate the effects of particle geometry and properties on the raceway's size and shape. The parameters of a DEM contact model were obtained through calibration experiments, and the established CFD–DEM model was validated through raceway experiments conducted in a fluidized bed setup. Rigid BB bullets and crushable sorghum seeds were used to simulate coke particles in the raceway experiments, and hysteresis in raceway size was discovered with changing inlet gas velocity. Spherical DEM particles were used to simulate the motion of BB bullets, and spherical, multi-sphere, and polyhedral particles were used to simulate the motion of sorghum particles. The use of nonspherical DEM particles with a shape closely resembling that of sorghum resulted in the simulated raceway size being within approximately 15 % of the experimental raceway size. Furthermore, the Tavares model was incorporated into the developed model to capture particle breakage effects, and the results indicated that particle fragmentation increases the pressure gradients in the raceway. Overall, the results revealed that the developed CFD–DEM model can accurately predict the raceway behavior of nonspherical or breakable particles under gas injection, thus providing insights for efficient blast furnace operations.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120952"},"PeriodicalIF":4.5,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760422","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 of water-soluble ions removal through enhanced heat exchange based on cloud-air-purifying technology

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-19 DOI: 10.1016/j.powtec.2025.120950

Haoyuan Xue, Qing Lv, Yuxiang Liu, Kunyan Fu, Yi Wei, Yumeng Zhang, Bo Wang

{"title":"Investigation of water-soluble ions removal through enhanced heat exchange based on cloud-air-purifying technology","authors":"Haoyuan Xue, Qing Lv, Yuxiang Liu, Kunyan Fu, Yi Wei, Yumeng Zhang, Bo Wang","doi":"10.1016/j.powtec.2025.120950","DOIUrl":"10.1016/j.powtec.2025.120950","url":null,"abstract":"<div><div>Pyrometallurgical processes are often accompanied by substantial particle emissions. These particles are ultra-fine and composed of water-soluble ions, making them challenging to effectively remove with existing dust removal equipment. To address this, this study focused on a pyrometallurgical plant in Northwest China, where particle matter emissions from the Kaldo furnace were monitored and analyzed. Based on particles characteristics, studies were conducted to develop process improvements. Firstly, field monitoring studies revealed that the particles at the Kaldo furnace outlet exhibited a bimodal distribution, with one peak consisting of metal particles around 0.6 μm in size. During the wet treatment, these metal particles are converted into water-soluble ions, leading to the wet electrostatic precipitator's removal efficiency of only 53.80 %. Furthermore, a new technology for fine particles removal was introduced, which called Cloud-Air-Purifying (CAP) technology. In CAP, through the effect of heterogeneous condensation, fine particles grow and were then collected in a supergravity field. Results indicated that CAP technology significantly improved overall particle removal efficiency, reaching 91.77 %. However, the average removal efficiency for water-soluble ions was 79.93 %. Subsequently, to improve the water-soluble ions' removal efficiency, theoretical calculations on nucleation rate and removal efficiency were performed. A strategy for enhancing nucleation by improving heat exchange was then established. After determining the temperature drop, long-term monitoring results showed that the upgraded system significantly improved the removal efficiency of water-soluble ions to 99.39 %. The heat-exchange cooling enhanced CAP technology successfully addressed the challenge of controlling water-soluble ions, providing theoretical support for wet dust removal technologies.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120950"},"PeriodicalIF":4.5,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686424","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

A breakage model for spherical particles without pre-packing and its validation in an impact crusher 无预包装球形颗粒的破碎模型及其在反击式破碎机中的验证

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-18 DOI: 10.1016/j.powtec.2025.120945

Hui Yuan , Fulei Chen , Likuan Chen, Zihan Liu, Yongzhi Zhao

{"title":"A breakage model for spherical particles without pre-packing and its validation in an impact crusher","authors":"Hui Yuan , Fulei Chen , Likuan Chen, Zihan Liu, Yongzhi Zhao","doi":"10.1016/j.powtec.2025.120945","DOIUrl":"10.1016/j.powtec.2025.120945","url":null,"abstract":"<div><div>The discrete element method (DEM) is a powerful tool for simulating particle breakage, offering valuable insights into the operation of industrial crushers. Although spheres do not fully capture the complexity of real particle shapes, their advantage in computational efficiency makes them highly valuable for breakage simulations involving a large number of particles with a wide size distribution. In this study, an improved breakage model for spherical particles without pre-packing is proposed, designed to offer high computational efficiency while maintaining satisfactory accuracy. In the proposed approach, the parental spherical particle is initially considered a polyhedron, which is then cut into a group of progeny polyhedral particles with a fast-cutting method. These fragments are subsequently replaced by spherical particles with the equivalent mass, achieving the sphere-sphere breakage process without setting the size and location of progeny particles in advance. The proposed model is validated by comparing its simulation of an impact crusher with both actual production (including product size distribution and energy consumption) and the polyhedron-to-polyhedron breakage simulation. The validation results demonstrate that the proposed model achieves significant computational efficiency while maintaining accuracy, making it a reliable tool for simulating particle breakage in practical applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120945"},"PeriodicalIF":4.5,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686389","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

Approximating heterogeneous colloidal transport by n-population filtration models

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-18 DOI: 10.1016/j.powtec.2025.120944

Nastaran Khazali, Thomas Russell, Pavel Bedrikovetsky

{"title":"Approximating heterogeneous colloidal transport by n-population filtration models","authors":"Nastaran Khazali, Thomas Russell, Pavel Bedrikovetsky","doi":"10.1016/j.powtec.2025.120944","DOIUrl":"10.1016/j.powtec.2025.120944","url":null,"abstract":"<div><div>This study evaluates the effectiveness of n-particle filtration models in approximating the behaviour of heterogeneous colloidal suspension flows in porous media. Using a numerical investigation, the study examines binary (<em>n</em> = 2) and ternary (<em>n</em> = 3) particle models to approximate breakthrough curves and retention profiles of systems with varying filtration coefficient distributions. The results show that binary and ternary models can effectively replicate the behaviour of systems with lower heterogeneity, where the ratio of maximum to minimum filtration coefficients remains moderate. However, as heterogeneity increases (higher coefficients of variation), the accuracy of lower-particle models decreases, and more particles are required to maintain model fidelity. The study highlights practical guidelines for model selection, recommending binary models for moderate heterogeneity and ternary models for high heterogeneity. It cautions against oversimplifying highly heterogeneous systems with low-particle models and provides a framework for iterative model refinement based on experimental data. This work offers a robust approach for modelling particle transport and retention in porous media, with applications in aquifer recharge, oil recovery, and environmental engineering.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120944"},"PeriodicalIF":4.5,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CFD-DEM coupled study on the characteristics of entrained air and particles dispersion during the particles flow impacting on a heap surface process

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-17 DOI: 10.1016/j.powtec.2025.120940

Hongfa Sun , Siliang Zhou , Jibo Long , Li Zeng

{"title":"CFD-DEM coupled study on the characteristics of entrained air and particles dispersion during the particles flow impacting on a heap surface process","authors":"Hongfa Sun , Siliang Zhou , Jibo Long , Li Zeng","doi":"10.1016/j.powtec.2025.120940","DOIUrl":"10.1016/j.powtec.2025.120940","url":null,"abstract":"<div><div>The process of loading and unloading bulk materials is common in industrial production. This process has become a major source of dust fugitive in industrial plants. In order to understand its dust production mechanism, this paper establishes a physical model of particles flow impacting on the material heap. The CFD-DEM coupling method is validated using experimental data. The effects of heap angle, particle velocity, and hopper outlet diameter on the characteristics of entrained airflow and particle motion are analyzed. The index of ‘entrained flux’ is proposed to assess the influence range of entrained air at the material heap tail. The results indicate that the entrained air velocity exhibits a Gaussian distribution along the normal direction of the material heap surface, with significant fluctuations at the upper part of the material heap and the formation of vortex motion at the material heap tail. The magnitude of the entrained flux is primarily influenced by the location of the vortex, which gradually moves away from the material heap as particle velocity and hopper outlet diameter increase. Conversely, as the heap angle increases, the vortex movement tends to approach the material heap. An objective weighting method is used to analyze the influence weights of the entrained flux, revealing that particle velocity has the highest weight of 39 %, while the hopper outlet diameter has the lowest weight of 26 %.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120940"},"PeriodicalIF":4.5,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686958","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

Numerical investigation on settling process of bi-disperse cohesive particle clouds 双分散凝聚粒子云沉降过程的数值研究

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-17 DOI: 10.1016/j.powtec.2025.120912

Jianxin Hu , Jingjing Xu , Jiafeng Xie , Dingyi Pan

{"title":"Numerical investigation on settling process of bi-disperse cohesive particle clouds","authors":"Jianxin Hu , Jingjing Xu , Jiafeng Xie , Dingyi Pan","doi":"10.1016/j.powtec.2025.120912","DOIUrl":"10.1016/j.powtec.2025.120912","url":null,"abstract":"<div><div>Cohesive forces lead to widespread particle flocculation, significantly altering the settling dynamics of particle clouds. The microscopic dynamics of cloud settling require further investigation, especially considering inter-particle cohesion and poly-dispersity caused by particle density variations in practical engineering applications. Motivated by this, we employ an Eulerian–Lagrangian computational fluid dynamics-discrete element method (CFD–DEM) coupling model to investigate the settling behavior of bi-disperse cohesive particle clouds in a stationary flow field. The results indicate that, for non-cohesive clouds, the large inertia of heavy particles prevents them from following the vortex back into the cloud, resulting in the upward segregation and leakage of heavy particles. The introduction of cohesion reduces the vertical particle segregation at low density ratios and intensifies segregation at high density ratios. This behavior is associated with floc formation and vortex structures. These segregation characteristics provide valuable insights into the directional recovery of heavy metal particles from wastewater. Furthermore, involving cohesion promotes the horizontal dispersion of particles by influencing the vortex structure. It contributes to a better understanding of particle dispersion in aquatic environments and providing guidance for the use of flocculants in engineering applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120912"},"PeriodicalIF":4.5,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686386","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

A fluidised bed particle engineering approach for simultaneous encapsulation and granulation of an API-based ionic liquid 采用流化床颗粒工程方法同时封装和造粒以原料药为基础的离子液体

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-17 DOI: 10.1016/j.powtec.2025.120931

Michael W. Stocker , Anne Marie Healy , Steven Ferguson

{"title":"A fluidised bed particle engineering approach for simultaneous encapsulation and granulation of an API-based ionic liquid","authors":"Michael W. Stocker , Anne Marie Healy , Steven Ferguson","doi":"10.1016/j.powtec.2025.120931","DOIUrl":"10.1016/j.powtec.2025.120931","url":null,"abstract":"<div><div>Solidification of room temperature ionic liquids provides advantages in terms of handling and utilisation in the context of solid dosage forms. Encapsulating drug-based ionic liquids by direct spray operations represents a promising platform for solidifying and formulating these challenging materials. Previous studies have focused on solidification of room temperature active pharmaceutical ingredient (API) ionic liquids (API-ILs) by spray drying. This approach typically results in the production of fine powders that tend to require further processing before they can be incorporated into final solid dosage forms. Fluidised bed granulation is an alternative technology that combines a direct spray operation with a particle size enlargement process. Successfully encapsulating an API-IL using this approach would circumvent suboptimal bulk powder properties of spray dried materials associated with their fine particle size and poor flowability, with the possibility of coating the granular cores with controlled release polymers and blending with additional excipients to yield a highly engineered drug product suitable for direct compression. In the current work a model API-IL was successfully granulated by adapting the spray encapsulation process to operate in a fluidised bed granulator and incorporating an inert filler material in the granulated product. The spray granulated API-IL products from this process were characterised with regard to their particle size, composition, and powder flow properties, and preliminary tabletting studies were performed using the granulates. This is the first demonstrated example of a composite drug product of its kind.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120931"},"PeriodicalIF":4.5,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0