Powder Technology最新文献_第5页

Experimental and simulation studies on the capture of micro-particles by a single droplet

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-17 DOI: 10.1016/j.powtec.2025.120937

Jun Xie, Lijuan Hou, Qiang Ma, Yanchen Li, Jinlin Bian, Rundong Li

{"title":"Experimental and simulation studies on the capture of micro-particles by a single droplet","authors":"Jun Xie, Lijuan Hou, Qiang Ma, Yanchen Li, Jinlin Bian, Rundong Li","doi":"10.1016/j.powtec.2025.120937","DOIUrl":"10.1016/j.powtec.2025.120937","url":null,"abstract":"<div><div>Coal, as a principal fossil energy source, occupies a crucial role in the global energy landscape. Nevertheless, the fine particles generated during the combustion of coal have exerted severe negative influences on human health, air visibility, and equipment safety. This paper focuses on wet flue gas desulfurization and collaborative dust removal technology as the research context. High-speed photography technology was employed to record the motion behavior of silica (SiO<sub>2</sub>) particles impacting deionized water, thereby the suspension/sinking phase diagram of the particles was obtained, and a fitting relationship between the particle size and the critical sinking velocity was established. The relationship was employed as the boundary condition and integrated with the Discrete Phase Model (DPM) in Computational Fluid Dynamics (CFD), and then the capture efficiency of micron-sized particles depositing onto the surface of liquid droplets was studied quantitatively. Moreover, the deposition distribution was explored by developing User Defined Functions (UDF). Finally, the influence of parameters such as particle sphericity, droplet diameter, airflow velocity, temperature difference, and droplet deformation rate on the capture efficiency, deposition distribution, and capture mechanism was elucidated, thereby providing theoretical support for the efficient removal of fine particles.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120937"},"PeriodicalIF":4.5,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686388","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

High-performance spherical W-Cu composite powders for additive manufacturing via spray granulation and cold isostatic pressure sintering

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-16 DOI: 10.1016/j.powtec.2025.120935

Jie Mao , Nan Ye , Zichun Wu , Ziyi Gong , Haiou Zhuo , Wentan Zhu , Jiancheng Tang

{"title":"High-performance spherical W-Cu composite powders for additive manufacturing via spray granulation and cold isostatic pressure sintering","authors":"Jie Mao , Nan Ye , Zichun Wu , Ziyi Gong , Haiou Zhuo , Wentan Zhu , Jiancheng Tang","doi":"10.1016/j.powtec.2025.120935","DOIUrl":"10.1016/j.powtec.2025.120935","url":null,"abstract":"<div><div>Developing spherical W-Cu composite powders offers a promising solution for achieving additive manufacturing to prepare W-Cu composites with finer microstructures and superior properties. However, the melting point difference and poor wettability of W and Cu hinder traditional powder preparation methods. Spray drying with sintering densification provides an efficient, cost-effective, and eco-friendly approach to producing dense spherical powders for additive manufacturing. This study developed spherical W-Cu composite powders for additive manufacturing using WO<sub>3</sub> and CuO as raw materials. Initially, a spherical W-Cu precursor powder was synthesized from WO<sub>3</sub> and CuO via spray-drying granulation. The precursor powder was then subjected to a three-stage reduction procedure. Finally, high-performance powders were produced via cold isostatic pressing and high-temperature sintering with ultrafine WO<sub>3</sub> as the sintering barrier. The resulting powders exhibited high sphericity, good dispersion, high densification, and fine-grained microstructures with uniform elemental distribution, as well as excellent fluidity (11.6 s/50 g), high loose apparent density (7.65 g/cm<sup>3</sup>), and low oxygen content (225 ppm), rendering them ideal for additive manufacturing. Laser-directed energy deposition (L-DED)-fabricated parts exhibited outstanding properties, including high densification (relative density 96.2 %), excellent tensile strength (512.57 MPa), hardness (260.6 HV<sub>0.5</sub>), electrical conductivity (37.93 % IACS), and thermal conductivity (215.35 W/mK), comparable to the W-Cu parts produced using conventional processes. The proposed method offers a promising approach for the development of advanced materials tailored to AM technologies.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120935"},"PeriodicalIF":4.5,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687460","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

Measurement of the particle density of small amounts of pharmaceutical powders using high-contrast micro X-ray computed tomography

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-15 DOI: 10.1016/j.powtec.2025.120929

Tamaki Miyazaki , Yoshihiro Takeda , Daisuke Ando , Tatsuo Koide , Yoji Sato , Eiichi Yamamoto

{"title":"Measurement of the particle density of small amounts of pharmaceutical powders using high-contrast micro X-ray computed tomography","authors":"Tamaki Miyazaki , Yoshihiro Takeda , Daisuke Ando , Tatsuo Koide , Yoji Sato , Eiichi Yamamoto","doi":"10.1016/j.powtec.2025.120929","DOIUrl":"10.1016/j.powtec.2025.120929","url":null,"abstract":"<div><div>Particle density is a fundamental and important physical property of powders. However, the widely used gas displacement pycnometry (GDP) method typically requires sample volumes in the gram range. In this study, we developed a method for evaluating the density of milligram-scale samples using X-ray computed tomography (XRCT). We used pharmaceutical powders, consisting of organic and light metallic elements, as subjects. The volumes of 24 pharmaceutical powders (2–160 mg) with various particle sizes and shapes were measured using an XRCT device with a resolution of 0.65–2.6 μm (field of view: 1.33–5.32 mm). Copper and molybdenum targets were used as X-ray sources, providing high-contrast imaging for materials with low electron densities. The densities obtained using XRCT correlated well with those obtained using GDP, as indicated by a linear regression line with a slope of 1.0 passing through the origin. The coefficient of variation for six sequential measurements was 0.0070, suggesting high repeatability. Additionally, we investigated optimal experimental conditions, such as spatial resolution, X-ray sources, and measurement time, to enhance the quality of three-dimensional XRCT images. We found that images with a grayscale histogram peak separation of approximately one between the sample and other components (sample tube and air) yielded optimal results. This non-destructive technique has the potential to accurately measure the densities of small sample quantities and can contribute not only to the pharmaceutical field but also to other industries handling organic and light metallic powders.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120929"},"PeriodicalIF":4.5,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687410","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

Study on sintering density and microstructure of metal injection molding of TiAl alloy using a new blend powder combination

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-15 DOI: 10.1016/j.powtec.2025.120936

Ce Zhang , Hanlin Wang , Rui Liu , Jiazhen Zhang , Xin Lu

引用次数: 0

Predictive models for energy dissipation in mechanochemical ball milling 机械化学球磨中能量耗散的预测模型

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-15 DOI: 10.1016/j.powtec.2025.120919

Santiago Garrido Nuñez , Dingena L. Schott , Johan T. Padding

{"title":"Predictive models for energy dissipation in mechanochemical ball milling","authors":"Santiago Garrido Nuñez , Dingena L. Schott , Johan T. Padding","doi":"10.1016/j.powtec.2025.120919","DOIUrl":"10.1016/j.powtec.2025.120919","url":null,"abstract":"<div><div>High-energy ball milling is a versatile method utilized in mechanochemical reactions and material transformations. Understanding and characterizing the relevant mechanical variables is crucial for the optimization and up-scaling of these processes. To achieve this, the present study delves into differentiating the contributions of normal and tangential interactions during high-energy collisions. Using Discrete Element Method (DEM) simulations, we characterize how operational parameters influence these energy dissipation modes, emphasizing the significance of tangential interactions. Our analysis also reveals how different operational parameters such as ball size, fill ratio, and rotational speed affect the mechanical action inside the milling jar giving rise to multiple operating zones where different modes of energy dissipation can thrive. Finally, we present master curves that generalize findings across a wide range of configurations, offering a tool for characterizing and predicting mechanochemical processes beyond the presented cases. These results provide a robust framework for improving mechanochemical reaction efficiency, and equipment design.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120919"},"PeriodicalIF":4.5,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687459","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

Experimental and numerical investigation on the performances of multiphase jet nozzles equipped with different motive tubes

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-15 DOI: 10.1016/j.powtec.2025.120932

Yan Hu , Jincheng Zhang , Youyu Liu , Bowen Wu , Jiabao Pan

{"title":"Experimental and numerical investigation on the performances of multiphase jet nozzles equipped with different motive tubes","authors":"Yan Hu , Jincheng Zhang , Youyu Liu , Bowen Wu , Jiabao Pan","doi":"10.1016/j.powtec.2025.120932","DOIUrl":"10.1016/j.powtec.2025.120932","url":null,"abstract":"<div><div>Suction multiphase jet machining (MJM) technology is a particulate erosion machining process utilizing vacuum to entrain slurry, wherein the motive tube is a pivotal unit that determines the jet nozzle performances. This paper presented an innovative MJM nozzle design featuring a Laval-shape motive tube, as well as the other three shapes: cylindrical, convergent and convergent-cylindrical. The work focused on investigating and comparing the performances of jet nozzles equipped with different motive tubes by experiments and simulations. It is found that the nozzle equipped with Laval-shape motive tube could generate the strongest vacuum while sucking the least slurry mixture, whereas these for nozzles equipped with cylindrical or convergent-cylindrical motive tube were opposite. The use of nozzle with Laval-shape motive tube was beneficial for rapid material removal owing to large velocity, enabling the fast machining of deep features, whereas the use of nozzles with cylindrical or convergent-cylindrical motive tube promoted the material's micro-removal to afford a relatively smooth surface. The significance of this work is that these findings are expected to provide a general guideline for MJM nozzle design and application.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120932"},"PeriodicalIF":4.5,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687455","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

Deep-learning-assisted near-infrared hyperspectral imaging for microplastic classification 用于微塑料分类的深度学习辅助近红外高光谱成像技术

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-15 DOI: 10.1016/j.powtec.2025.120933

Melisa Nyakuchena, Cory Juntunen, Yongjin Sung

{"title":"Deep-learning-assisted near-infrared hyperspectral imaging for microplastic classification","authors":"Melisa Nyakuchena, Cory Juntunen, Yongjin Sung","doi":"10.1016/j.powtec.2025.120933","DOIUrl":"10.1016/j.powtec.2025.120933","url":null,"abstract":"<div><div>Microplastics are small plastics with a size between a few microns and about 5 mm. Due to their small size, microplastics can be ingested by living organisms including humans, which has become a global concern and a heated area of research. To detect and characterize microplastics, various methods have been used, among which Fourier transform infrared (FTIR) spectroscopy and Raman spectroscopy offer nondestructive solutions. In this study, using deep-learning-assisted hyperspectral imaging (HSI) in the near-infrared (NIR) range of 1100–1650 nm, we demonstrate high-throughput, nondestructive classification of microplastics. Because NIR light is barely absorbed by most plastics and highly scattered by small particles, NIR-HSI has mostly been used for microplastics larger than 100 μm. Using deep learning in combination with Fourier transform spectroscopy, here we show NIR-HSI can classify microplastics in the 10–100 μm range with an accuracy over 99 % and at a speed much faster than FTIR or Raman spectroscopy. The demonstrated method offers a new solution for high-throughput detection and classification of microplastics.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120933"},"PeriodicalIF":4.5,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687457","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 simulation of industrial vinyl chloride suspension polymerization reactor by CFD-guided downscaling: From liquid-liquid dispersion to solid-liquid suspension

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-14 DOI: 10.1016/j.powtec.2025.120926

Jian-Peng Han , Hao Chen , Ya-Nan Yang , Qiang Niu , Zheng-Hong Luo , Yin-Ning Zhou

{"title":"Numerical simulation of industrial vinyl chloride suspension polymerization reactor by CFD-guided downscaling: From liquid-liquid dispersion to solid-liquid suspension","authors":"Jian-Peng Han , Hao Chen , Ya-Nan Yang , Qiang Niu , Zheng-Hong Luo , Yin-Ning Zhou","doi":"10.1016/j.powtec.2025.120926","DOIUrl":"10.1016/j.powtec.2025.120926","url":null,"abstract":"<div><div>Numerical scale-up plays a key role in industrial production of commercial polymers. However, direct simulation of industrial reactor is generally challenging due to its large volume. In this contribution, a 106 m<sup>3</sup> industrial vinyl chloride (VC) suspension polymerization reactor equipped with flat impeller is scaled down to a 31.4 L geometrically similar reactor by a factor of 14.2 based on the scale-up rule of constant power input per volume (<em>P</em>/<em>V</em>). Multiphase phenomena including both liquid-liquid dispersion (i.e., insoluble monomer is shaped into micrometer-sized droplets with a certain distribution by turbulence shear) and solid-liquid suspension inside the small reactor are studied via computational fluid dynamics-population balance model (CFD-PBM) and CFD-kinetic theory of granular flow (CFD-KTGF) simulations, respectively. Flow characteristics, droplet size distributions (DSDs) and impeller performances with different stirring speeds <em>N</em>, impeller diameters <em>D</em>, blade widths <em>b</em> and off-bottom clearances <em>C</em> are elaborated. Formulas correlating power number <em>N</em><sub>p</sub>, flow number <em>N</em><sub>qc</sub> with <em>D</em> and <em>b</em> are obtained, providing guidelines for selecting proper impeller sizes and operation conditions. Simulation results indicate that an impeller with low off-bottom clearance is better for suspension polymerization process. For impeller optimization, a dual axial impeller with 45°-pitched blades is more suitable as confirmed by improved homogeneity inside the reactor, narrower DSD and lower power input. The present study tracks the multiphase flows inside the suspension polymerization reactor and offers insights beneficial for its scale-up and optimization.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120926"},"PeriodicalIF":4.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687426","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

Simulation of synthesizing carbon nanotubes by catalytic chemical vapor deposition in a fluidized bed using a CFD-PBM model

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-14 DOI: 10.1016/j.powtec.2025.120927

Mengting Liu , Mengdie Wang , Kefei Zhang , Hesheng Yu

{"title":"Simulation of synthesizing carbon nanotubes by catalytic chemical vapor deposition in a fluidized bed using a CFD-PBM model","authors":"Mengting Liu , Mengdie Wang , Kefei Zhang , Hesheng Yu","doi":"10.1016/j.powtec.2025.120927","DOIUrl":"10.1016/j.powtec.2025.120927","url":null,"abstract":"<div><div>Catalytic chemical vapor deposition (CCVD) within a fluidized bed reactor (FBR) is a cost-effective method to achieve continuous and large-scale production of high-quality carbon nanotubes (CNTs). This paper presents a computational fluid dynamics-population balance model (CFD-PBM) coupling model to simulate the production of CNTs by CCVD of ethylene in a bubbling FBR. First, the kinetics of ethylene catalytic cracking and size-dependent particle growth rate equation are proposed to simulate the CNTs growth for the initial 10 min. The CFD-PBM simulation can satisfactorily predict experimental data with a deviation of 7.76 % for carbon yield and 10.29 % for particle growth rate. Furthermore, the model is used to explore the effects of several operating conditions (<em>i.e.</em>, ethylene mole fraction, superficial gas velocity, initial bed height) on carbon yield, hydrogen yield, particle growth rate and bed expansion ratio. The simulation results and experimental data (or those predicted by empirical equations) share similar variation trends. The proposed CFD-PBM coupling model can be further improved to guide the operation and optimization of CNTs production process.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120927"},"PeriodicalIF":4.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687411","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

Novel nanoparticle mixing approach for the production of solid-state battery hetero-agglomerates in vibrated fluidized beds

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-14 DOI: 10.1016/j.powtec.2025.120906

Zhi Cheng Hua , Finn Frankenberg , Maximilian Kissel , Jürgen Janek , Arno Kwade , Stefan Heinrich

{"title":"Novel nanoparticle mixing approach for the production of solid-state battery hetero-agglomerates in vibrated fluidized beds","authors":"Zhi Cheng Hua , Finn Frankenberg , Maximilian Kissel , Jürgen Janek , Arno Kwade , Stefan Heinrich","doi":"10.1016/j.powtec.2025.120906","DOIUrl":"10.1016/j.powtec.2025.120906","url":null,"abstract":"<div><div>A vibrated fluidized bed with microjet assistance is utilized to mix heterogeneous submicron-sized battery materials. This process aims to improve the homogeneity and electrochemical performance of a solid-state cathode composite consisting of LiFePO<sub>4</sub> (LFP), Li<sub>3</sub>InCl<sub>6</sub> (LIC) and carbon black (CB). A downwards directed microjet was employed to enhance fluidization and mixing quality. The research involved a parametric study, examining various vibration intensities, microjet nozzle sizes, and fluidization times to determine the optimal conditions for achieving a homogeneous composite on the microscale. Scanning electron microscope (SEM) and focused ion beam SEM (FIB-SEM) imaging were used to assess the mixing quality and confirm the formation of heteroagglomerates. Assisted fluidization alone produces composites with inferior mixing quality, whereas a microjet significantly improves mixing. Electrochemical testing reveals that a vibrated fluidized bed alone is inadequate for mixing submicron-sized particles for battery applications, whereas the microjet enables the mixing and ionically bound active material.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120906"},"PeriodicalIF":4.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725914","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