Powder Technology最新文献_第7页

Reconstruction of aeolian sand grain saltation based on inter-frame particle tracking algorithm and geometric constraints

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-12 DOI: 10.1016/j.powtec.2025.120792

Kaiyuan Guan , Yang Zhang , Bin Yang , Yuanwei Lin , Xin Gao

{"title":"Reconstruction of aeolian sand grain saltation based on inter-frame particle tracking algorithm and geometric constraints","authors":"Kaiyuan Guan , Yang Zhang , Bin Yang , Yuanwei Lin , Xin Gao","doi":"10.1016/j.powtec.2025.120792","DOIUrl":"10.1016/j.powtec.2025.120792","url":null,"abstract":"<div><div>The saltation trajectories of sand grains serve as a direct indicator of the two-phase interaction during the process of aeolian sand transport. Particle Tracking Velocimetry (PTV) has been employed to reconstruct these saltation trajectories. However, traditional PTV algorithms encounter difficulties due to the randomness and three-dimensional (3D) characteristics of sand-grain motion, which impede the complete reconstruction of saltation trajectories. This paper puts forward a PTV algorithm grounded on the Voronoi diagram (VD). It is demonstrated that this algorithm exhibits higher accuracy compared to other VD-based PTV algorithms. A homemade algorithm called Dual Angular Constraint (DAC) is introduced to support the proposed PTV algorithm, ensuring the most comprehensive reconstruction of saltation trajectories. Through a test using 3D artificial particle flows, the robustness of the proposed PTV algorithm in 3D space is validated. This validation offers the feasibility for the visualization of sand-grain motion in practical applications, accompanied by efficient and accurate kinematic analysis.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120792"},"PeriodicalIF":4.5,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422212","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

Selecting effective powder characterization tests for reliable estimation of bin blending performance

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-12 DOI: 10.1016/j.powtec.2025.120790

Fatemeh Mostafaei , Johannes G. Khinast , Thomas Forgber

{"title":"Selecting effective powder characterization tests for reliable estimation of bin blending performance","authors":"Fatemeh Mostafaei , Johannes G. Khinast , Thomas Forgber","doi":"10.1016/j.powtec.2025.120790","DOIUrl":"10.1016/j.powtec.2025.120790","url":null,"abstract":"<div><div>The Discrete Element Method (DEM) has become an important tool for gaining a deeper understanding of granular blending. It allows for the evaluation of process performance in terms of blending and segregation before conducting experiments, thus shortening development times. While DEM simulations employ simplifications to overcome computational limits, they still need to accurately present the bulk granular behavior of real materials. In powder handling, ensuring the similarity between simulations and reality is achieved through model parameter calibration. Despite significant efforts in calibration, there is still no established method for selecting suitable test devices during the calibration step before applying DEM to a specific application. The current study addresses this gap by conducting a numerical investigation of pharmaceutical powders' behavior in characterization tests (including the rotating drum, compression, and shear tests) and in a lab-scale bin blender. A new parameter, called the circularity, is introduced in the data evaluation of the rotating drum process. Various statistical analyses are used to identify the most and least relevant parameters from the characterization tests that relate to the powder blending performance. In total, 15 parameters from the characterization tests were correlated with blending time and powder size segregation in the studied bin blender for 67 different powders.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120790"},"PeriodicalIF":4.5,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464405","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

Fines migration and clogging under pH alteration: Stochastic model and its upscaling

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-12 DOI: 10.1016/j.powtec.2025.120778

G. Loi, Y. Yang, C. Nguyen, T. Russell, P. Bedrikovetsky

{"title":"Fines migration and clogging under pH alteration: Stochastic model and its upscaling","authors":"G. Loi, Y. Yang, C. Nguyen, T. Russell, P. Bedrikovetsky","doi":"10.1016/j.powtec.2025.120778","DOIUrl":"10.1016/j.powtec.2025.120778","url":null,"abstract":"<div><div>Profound understanding of fine particle detachment, mobilisation, migration and consequent porous media clogging is essential for optimal design and clean-up of filter beds in water purification and wastewater treatment processes. In particular, changes in the solution pH affect the electrostatic force between particles and rocks which regulates particle detachment induced by viscous forces; fines detachment and migration usually leads to serious well rate decrease. The change in the concentration of attached particles when changing pH is quantified using a maximum retention function (MRF). Currently, this function can only be determined empirically from experiments despite strong theoretical foundations for predicting particle detachment. In this work, the microscale description of particle detachment is linked with macroscale predictions of particle detachment by averaging the condition of mechanical equilibrium over the distributions of microscale parameters. Heterogeneities of attached particles and pore space are reflected in probability distributions of relevant parameters. A Monte Carlo algorithm is implemented to combine the parameter distributions and detachment condition to calculate the MRF. The methodology allows for predictive modelling of particle detachment, and inverse modelling of the microscale parameter distributions. Inverse modelling is performed on two coreflooding tests in which the injected pH was varied. Fitting shows good agreement with the detachment model and the lever arm and aspect ratios determined during fitting are within commonly reported intervals. The model is used to recalculate the MRF versus velocity, which is then used to predict formation damage for production and injection wells at different values of pH.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120778"},"PeriodicalIF":4.5,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508057","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

Hygroscopic characteristics of salt particles based on molecular dynamics simulations

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-11 DOI: 10.1016/j.powtec.2025.120787

Lingxiao Zhan , Xin Wang , Dawei Hou , Heng Chen , Suoqi Zheng , Yurui Wang , Zhihao Li , Zhanxing Chen , Hao Wu , Linjun Yang

{"title":"Hygroscopic characteristics of salt particles based on molecular dynamics simulations","authors":"Lingxiao Zhan , Xin Wang , Dawei Hou , Heng Chen , Suoqi Zheng , Yurui Wang , Zhihao Li , Zhanxing Chen , Hao Wu , Linjun Yang","doi":"10.1016/j.powtec.2025.120787","DOIUrl":"10.1016/j.powtec.2025.120787","url":null,"abstract":"<div><div>Molecular dynamics simulations are performed to investigate the hygroscopic growth of typical salt particles and their mixtures in supersaturated water vapor. Nucleation and condensational growth are analyzed. The results showed the dominant factors controlling the growth of the salt particle are condensation and collisions thereafter. The salt particles help to the hygroscopic growth. MgCl<sub>2</sub> possesses the highest tendency of hygroscopicity. The self-diffusivity of water in the MgCl<sub>2</sub> case (1.54 × 10<sup>−6</sup> m<sup>2</sup>/s) is much smaller than that of the homogeneous case (2.23 × 10<sup>−6</sup> m<sup>2</sup>/s). Radial distribution analysis (RDF) confirms the dissociation of ionic bonds and the formation of the hydration shell. Particle number concentration (PNC) and particle mass concentration (PMC) have different influence mechanisms on nucleation and growth. Moreover, the supersaturation degree is modified by changing the vapor pressure and temperature. Homogeneous nucleation is found to be more susceptible to changes in supersaturation than heterogeneous nucleation.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120787"},"PeriodicalIF":4.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422214","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

Segmentation and tracking: A deep learning-based method for analyzing dynamic features of aluminum agglomerates

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-11 DOI: 10.1016/j.powtec.2025.120785

Xiaohui Xue, Huanhuan Gao, Zhihao Sun, JianZhong Liu

{"title":"Segmentation and tracking: A deep learning-based method for analyzing dynamic features of aluminum agglomerates","authors":"Xiaohui Xue, Huanhuan Gao, Zhihao Sun, JianZhong Liu","doi":"10.1016/j.powtec.2025.120785","DOIUrl":"10.1016/j.powtec.2025.120785","url":null,"abstract":"<div><div>The phenomenon of aluminum agglomeration, which occurs during the combustion of aluminized solid propellants, can have a series of adverse effects on solid rocket motors. High-speed microimaging has been demonstrated to be an effective technique for investigating this phenomenon. Consequently, an efficient and accurate analysis of aluminum agglomerates in high-speed video is a crucial aspect of this research. However, traditional analysis methods often produce unsatisfactory segmentation results in complex images and show low efficiency in extracting the features of the same agglomerate across multiple frames. To address these issues, this study proposes an online analysis method based on deep learning, which allows for the real-time segmentation and cross-frame tracking of aluminum agglomerates. Comparative experiments with the classical threshold-based method demonstrate the effectiveness and superior accuracy of the proposed method, with the <em>AP50</em> metric improving significantly from 0.546 to 0.940, achieving impressive segmentation performance. Subsequently, the method was employed to analyze the overall velocity characteristics, features of individual agglomerates, and the second mergence phenomenon of aluminum agglomerates. The analysis captured the complete dynamic process of agglomerates from formation to exiting the frame and yield a linear correlation between the projected area and maximum vertical velocity. The proposed method markedly simplifies the analysis process for aluminum agglomerates, furnishes more detailed dynamic information, and provides robust support for further studies on aluminum particle combustion and agglomeration mechanisms.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120785"},"PeriodicalIF":4.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427525","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

Exhaust gas recirculation cooler fouling morphology: Characterisation, spatiotemporal nature, and system variable-morphology-property correlation

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-11 DOI: 10.1016/j.powtec.2025.120786

Yipeng Yao , Zhiqiang Han , Liping Luo , Hai Du , Wei Tian , Xueshun Wu , Zinong Zuo , Marie-Eve Duprez , Guy De Weireld

{"title":"Exhaust gas recirculation cooler fouling morphology: Characterisation, spatiotemporal nature, and system variable-morphology-property correlation","authors":"Yipeng Yao , Zhiqiang Han , Liping Luo , Hai Du , Wei Tian , Xueshun Wu , Zinong Zuo , Marie-Eve Duprez , Guy De Weireld","doi":"10.1016/j.powtec.2025.120786","DOIUrl":"10.1016/j.powtec.2025.120786","url":null,"abstract":"<div><div>Fouling is one of the primary causes of failure in exhaust gas recirculation (EGR) coolers. Morphology may provide a powerful perspective for understanding the mechanisms, behaviours, and properties of fouling. However, a systematic review of fouling morphology is currently lacking. Considering the substantial progress made in morphology-related studies within the industry in recent years, this work reviews the findings on EGR cooler fouling morphology from four aspects: characterisation (scale, object, category, and technique), spatiotemporal nature, variable-morphology correlation, and morphology-property correlation. Furthermore, the current challenges and opportunities in this field are discussed. Based on this, we propose a framework for the morphological characterisation of EGR cooler fouling. It is demonstrated that morphology plays a crucial role in revealing the spatiotemporal characteristics of fouling, the formation and removal mechanisms, and the correlations among system variables, morphology, and properties. Morphology still holds significant potential in four areas: multi-scale and quantitative characterisation, nomenclature and taxonomy, and full lifecycle evolution. The findings provide a morphological perspective for fouling research within the industry and contribute to advancing the science of fouling morphology.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120786"},"PeriodicalIF":4.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402642","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 lightweight and explainable model to predict the dynamic normal stress on silo wall assisted with knowledge distillation

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-11 DOI: 10.1016/j.powtec.2025.120753

Zhijun Xu , Huijie Guo , Yong Cheng , Yang Han , Huawei Tao

引用次数: 0

Precision mist injection strategy for enhanced hydrodynamic stability in oscillating bubbling fluidized beds

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-11 DOI: 10.1016/j.powtec.2025.120770

Stefan Vogel , Ali Akbar Sarbanha , Seyed Mohammed Taghavi , Markus Schubert , Faïçal Larachi

{"title":"Precision mist injection strategy for enhanced hydrodynamic stability in oscillating bubbling fluidized beds","authors":"Stefan Vogel , Ali Akbar Sarbanha , Seyed Mohammed Taghavi , Markus Schubert , Faïçal Larachi","doi":"10.1016/j.powtec.2025.120770","DOIUrl":"10.1016/j.powtec.2025.120770","url":null,"abstract":"<div><div>This study investigates precision mist injection into a cuboidal pseudo-2D fluidized bed on a robotic sea wave simulator to stabilize bubbling and homogenize hydrodynamics under 9° inclination and 0.1 Hz rolling motion. Digital image analysis and particle image velocimetry are used to evaluate the effects of mist injection on defluidization, void fraction, particle motion, and fluidization regime changes. Liquid injection effectively reduces bubble and slug sizes and controls particle velocities without causing defluidization/agglomeration. Symmetric injection is ineffective in inclined beds and does not significantly reduce slug size in rolling beds, but does reduce bubble size. Asymmetric injection consistently performs better, especially in rolling conditions, by reducing bubble size and velocity and reducing slugging. Double point injection proves to be the most reliable and significantly reduces bed maldistribution in rolling configurations. These results suggest potential offshore applications, where mist-induced surface changes reduce sensitivity to sea-like motion.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120770"},"PeriodicalIF":4.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394691","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

DEM-FEM investigation of the particle transport process in a flexible tube

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-11 DOI: 10.1016/j.powtec.2025.120776

Huaqing Ma , Chang Liu , Wenrui Wang , Zihan Liu , Lianyong Zhou , Zongqing Zhou , Kaiwei Chu , Yongzhi Zhao

{"title":"DEM-FEM investigation of the particle transport process in a flexible tube","authors":"Huaqing Ma , Chang Liu , Wenrui Wang , Zihan Liu , Lianyong Zhou , Zongqing Zhou , Kaiwei Chu , Yongzhi Zhao","doi":"10.1016/j.powtec.2025.120776","DOIUrl":"10.1016/j.powtec.2025.120776","url":null,"abstract":"<div><div>The transport of the particulate materials in a flexible tube is commonly encountered in practical applications, in which the flexible tube is easily susceptible to deformation and movement. However, there are relatively few published fundamental studies for investigating the particle transport process in a flexible tube, particularly at the particle level. As a consequence, the particle-scale DEM (Discrete Element Method) is coupled with FEM (Finite Element Method) in this work to simulate the particle flow in a flexible tube, in which the particle phase and the flexible tube are solved by DEM and FEM, respectively. The experiment of the flow of the copper spheres in a flexible silicone tube is then conducted to validate the accuracy of the developed DEM-FEM model, where the experimental apparatus mainly consists of a flexible tube, a hopper used to store particles prior to the commencement of the experiment, and a container to collect the particles that discharge from the tube. Subsequently, the particle flows in a flexible tube are simulated by DEM-FEM, and the relatively comprehensive investigation for exploring the impacts of physical properties of the tube (including Young's modulus, density and damping ratio) on the behaviors of the particles and the tube (<em>e.g.</em>, particle velocity, shear impact energy and vibration displacement behavior of the tube) is performed. According to the simulation results, the Young's modulus and the tube density can significantly affect both the particle behaviors and the tube deformation and movement behaviors, whereas the particle behaviors are slightly affected by the damping ratio.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120776"},"PeriodicalIF":4.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394692","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

Effect of gas flux on gangue recovery in a reflux flotation cell - a modelling and experimental study

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-10 DOI: 10.1016/j.powtec.2025.120771

Brady Wright, Kevin Galvin, Mahshid Firouzi

{"title":"Effect of gas flux on gangue recovery in a reflux flotation cell - a modelling and experimental study","authors":"Brady Wright, Kevin Galvin, Mahshid Firouzi","doi":"10.1016/j.powtec.2025.120771","DOIUrl":"10.1016/j.powtec.2025.120771","url":null,"abstract":"<div><div>Gangue particles, which are typically hydrophilic, impede the efficient recovery of valuable hydrophobic particles in flotation cells, and in turn lower the grade of the final concentrate. The system hydrodynamics, including the gas and liquid fluxes, and bubble segregation, plays a key role in the efficient separation of the valuable and gangue mineral particles. In conventional flotation cells, an increase in the gas flux leads to increased entrainment of the gangue minerals, due to an increase in water recovery. This new work investigates the effects of the gas flux and liquid fluxes on gangue entrainment in a Reflux Flotation Cell (RFC), a novel system that incorporates parallel inclined channels to prevent bubble losses to tailings.</div><div>The study focused exclusively on fine hydrophilic silica as the model gangue mineral in the feed, completely excluding hydrophobic particles. Rigorous, continuous, steady state experiments produced an accurate measure of the particle transport into the concentrate. It was concluded that the wash water addition removed the bulk entrainment. Hence, the observed entrainment was primarily due to bubble surface entrainment. Interestingly, the silica entrainment decreased with increasing the gas flux and wash water flux. The system hydrodynamics was quantified through measurement of the gas hold-up and the bubble size distribution. Drift flux theory was applied to these accurate datasets, confirming the significant role of enhanced segregation of the bubbles due to the presence of the inclined channels, an effect known as the Boycott Effect.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120771"},"PeriodicalIF":4.5,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454489","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