Powder Technology最新文献_第9页

Microscopic simulation on triaxial compression creep of rockfill based on subcritical crack propagation theory 基于次临界裂纹扩展理论的填石三轴压缩蠕变微观模拟

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-30 DOI: 10.1016/j.powtec.2024.120403

Xinjie Zhou , Shichun Chi , Yufeng Jia , Yu Guo , Wenquan Feng , Shihao Yan , Tengteng Wang , Xiyu Ma

{"title":"Microscopic simulation on triaxial compression creep of rockfill based on subcritical crack propagation theory","authors":"Xinjie Zhou , Shichun Chi , Yufeng Jia , Yu Guo , Wenquan Feng , Shihao Yan , Tengteng Wang , Xiyu Ma","doi":"10.1016/j.powtec.2024.120403","DOIUrl":"10.1016/j.powtec.2024.120403","url":null,"abstract":"<div><div>Over time, natural cracks within particles propagate under tensile stress, leading to the delayed breakage of these particles, which significantly contributes to the time-dependent deformation of rockfill materials. In this study, a delayed strength model for spherical particles with virtual cracks is proposed using subcritical crack propagation theory and validated through indoor single-particle creep tests. Based on the model, particles are represented as ideal spheres in the context of triaxial compression creep simulations for rockfill, with special attention to particle size effects, discreteness, and temporal factors. The combined influence of long-term strength and maximum contact force is crucial in determining the delayed particle breakage. Comparative analysis with indoor triaxial creep tests demonstrates that the Discrete Element Method (DEM) simulations accurately model the creep deformation phenomena related to delayed particle breakage in rockfill. Furthermore, statistical analysis indicates that a minor fraction of delayed particle breakage has a negligible impact on the temporal distribution of the Normalized Maximum Contact Force (NMCF).</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120403"},"PeriodicalIF":4.5,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142587334","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

Structure optimization for the discharge arm of the self-propelled forage harvester based on CFD-DEM 基于 CFD-DEM 的自走式牧草收割机卸料臂结构优化

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-29 DOI: 10.1016/j.powtec.2024.120399

Lei Liu, Xiaoyu Li, Yuefeng Du, Guorun Li, Yucong Wang, Du Chen, Zhongxiang Zhu, Zhenghe Song

引用次数: 0

Cork powder: Benefits and limitations as a sustainable cosmetic ingredient 软木粉：作为可持续化妆品成分的优点和局限性

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-28 DOI: 10.1016/j.powtec.2024.120396

Sandra Mota , Ana Torres , Ana Silva , José Paulo Silva , Joana Rocha e Silva , Helena Neto Ferreira , Maria T. Cruz , Isabel Martins de Almeida

{"title":"Cork powder: Benefits and limitations as a sustainable cosmetic ingredient","authors":"Sandra Mota , Ana Torres , Ana Silva , José Paulo Silva , Joana Rocha e Silva , Helena Neto Ferreira , Maria T. Cruz , Isabel Martins de Almeida","doi":"10.1016/j.powtec.2024.120396","DOIUrl":"10.1016/j.powtec.2024.120396","url":null,"abstract":"<div><div>To compensate for the massive environmental footprint of the cosmetic industry, this sector aims at a circular production/consumption system while intersecting the consumers' concerns about the exacerbated exploitation of natural resources. The high amount of agro-industrial waste generated by cork industries is of great interest due to the sustainable and regenerative capabilities of <em>Quercus suber</em> bark. This work aimed to explore the properties of cork powder, a by-product from cork processing, as a putative cosmetic ingredient. This powder was studied regarding the flowability and compressibility envisioning its use in solid water-free formulations, as well as the potential use as a functional ingredient in skin care and sun care formulations. Cork powder revealed a high compressibility and cake strength, which favors the formulation of water-free pressed powders. Poor flowability (Hausner ratio of 1.38 ± 0.01) should be, however, considered in the formulation design. The powder also revealed high oil absorption ability (203.6 ± 1.4 g/100 g) and sun protection factor (SPF) boosting effect, increasing SPF twofold when compared to a standard formulation. Ultimately, the safety profile of the cork powder was confirmed in cells representative of the human epidermis up to 50 mg/mL. Limitations of this product are associated with being a natural product, namely a high microbiological burden. This issue, along with stability and reproducibility should be addressed before considering industrial application. Cork powder showed a multifunctional profile, supporting its use as a sustainable stiffening ingredient agent of solid/water-free decorative cosmetics, or as a mattifying and photoprotective agent.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120396"},"PeriodicalIF":4.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552801","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

Numerical study on the deposition distribution and mechanism of inhaled drug particles in various regions of the realistic inhaler-airway model 关于吸入药物颗粒在现实吸入器-气道模型各区域沉积分布和机制的数值研究

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-28 DOI: 10.1016/j.powtec.2024.120402

Lixing Zhang , Zhenbo Tong , Ya Zhang , Aibing Yu

{"title":"Numerical study on the deposition distribution and mechanism of inhaled drug particles in various regions of the realistic inhaler-airway model","authors":"Lixing Zhang , Zhenbo Tong , Ya Zhang , Aibing Yu","doi":"10.1016/j.powtec.2024.120402","DOIUrl":"10.1016/j.powtec.2024.120402","url":null,"abstract":"<div><div>Inhaled drug delivery is widely used in the treatment of respiratory diseases. Understanding the deposition mechanisms of dry powder inhalers (DPIs) in different regions of the airway is crucial for inhaler development and prediction of the deposition distribution of drug particles. And the insertion of the inhaler will significantly alter the pattern of airflow in the airway. The main objective of this study is to systematically investigate the distribution and mechanism of aerosol particle deposition in various regions of the inhaler-airway model. Computational fluid dynamics (CFD) was used to simulate the effect of inhalation flow rate on the deposition of drug particles in various regions of the airway. The discrete phase model (DPM) was adopted to track the deposition trajectories of drug particles. Three different inhalation flow rates together with six particle sizes and five particle densities were analyzed. The results indicated that the overall deposition fraction of drug particles gradually increased with particle size and density. The pattern of depositional distribution in other local areas is quite different from the overall pattern except in the oral. The deposition fraction in the pharynx was much larger than in the other local regions, the deposition fractions in the larynx, trachea, carina and bronchi were less than 5 %. The increase in density increases the deposition fraction of particles in various regions throughout the respiratory tract when the inhalation flow rate is 30 L/min. Most of the particles in the oral are deposited on the tongue, and the particles in the bronchus are more distributed in the main trunk, while deeper in the bronchus, particles are also deposited in the bifurcation region. The subject's inhalation posture also affects the local distribution of the airflow. The findings of present study can help to guide the optimization and in vitro-in vivo correlation of DPIs.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120402"},"PeriodicalIF":4.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571824","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 new aerosol delivery approach for enhanced long-term respiratory care in resource-poor settings 在资源匮乏地区加强长期呼吸道护理的新型气雾剂输送方法

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-28 DOI: 10.1016/j.powtec.2024.120398

Mohammed Asad Khan, Hrishikesh Gadgil, Sudarshan Kumar

{"title":"A new aerosol delivery approach for enhanced long-term respiratory care in resource-poor settings","authors":"Mohammed Asad Khan, Hrishikesh Gadgil, Sudarshan Kumar","doi":"10.1016/j.powtec.2024.120398","DOIUrl":"10.1016/j.powtec.2024.120398","url":null,"abstract":"<div><div>Continuous aerosol therapy is safe, superior, and the mainstay in the therapy of patients with severe asthma, cystic fibrosis, chronic obstructive pulmonary disease (COPD), and coronavirus disease (COVID-19). However, continuous nebulization has been perceived as highly expensive and labor-intensive, which often requires specialized medical equipment. Moreover, it is difficult to maintain consistent aerosol output and particle size delivery over an extended period without operator intervention. This work proposes a simple and reliable continuous nebulization method using a conventional gas jet nebulizer and intravenous (IV) bottle/bag. The present work reports detailed experimental studies on a gas jet nebulizer with Particle image velocimetry (PIV), Particle/droplet Imaging Analysis (PDIA), and Mie scattering techniques to demonstrate the feasibility of the proposed technique. The preliminary investigation shows that the proposed method provides continuous liquid output delivery without external supervision. The liquid delivery rate and mass median diameter (MMD) of the nebulizer mainly depend on the gas flow rate and suction height. The MMD of the primary generated droplets is reported to vary between 100 and 230 μm for a ± 10 cm suction height and 500–1000 mlph nebulization gas flow rate. Most importantly, the nebulizer spray angle, stability, droplet size distribution, and the axial and radial velocities of the droplets are marginally affected by the suction height. Therefore, the proposed system is a versatile, safe, and cost-effective method of continuous nebulization therapy, especially in resource-poor countries or contagious disease outbreak situations.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120398"},"PeriodicalIF":4.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552802","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

Process control and design of drying technologies for biopharmaceuticals – A review 生物制药干燥技术的过程控制和设计 - 综述

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-28 DOI: 10.1016/j.powtec.2024.120395

Wiktoria Brytan , Rodrigo Amorim , Luis Padrela

{"title":"Process control and design of drying technologies for biopharmaceuticals – A review","authors":"Wiktoria Brytan , Rodrigo Amorim , Luis Padrela","doi":"10.1016/j.powtec.2024.120395","DOIUrl":"10.1016/j.powtec.2024.120395","url":null,"abstract":"<div><div>Research into the production of solid-state biomolecules has increased in the last decade, uncovering new routes of administration and enhanced product stability. Freeze drying is the most common industrial method for biomolecule dehydration, however it requires long processing times and does not allow for particle engineering. Hence, new drying techniques are constantly being developed to produce dried biopharmaceuticals, facilitating the switch from batch to continuous manufacturing and improving control over particle attributes. The sensitive nature of biological products requires comprehensive optimisation of these new methods against the various degradative stresses imposed by drying. Process control and optimisation is key in minimizing many of these stresses, allowing production of dried powders with pre-determined characteristics (e.g. particle morphology, size and density). In this review, we provide a detailed overview of current methods used to date for the drying of biologics and the particle engineering capabilities of these methods, along with the process control possibilities that emerge with process analytical technology (PAT). We also look at the extent of mass and energy balances informing process optimisation and the effect of process controls on biomolecule stability, drying efficiency, and particle engineering.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120395"},"PeriodicalIF":4.5,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552264","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

Research on ash accumulation surface measurement methods based on the dot laser principle 基于点激光原理的积灰表面测量方法研究

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-24 DOI: 10.1016/j.powtec.2024.120389

Qianlong Li, Zhengwei Long, Wenjia Hao, Shaojie Guo

{"title":"Research on ash accumulation surface measurement methods based on the dot laser principle","authors":"Qianlong Li, Zhengwei Long, Wenjia Hao, Shaojie Guo","doi":"10.1016/j.powtec.2024.120389","DOIUrl":"10.1016/j.powtec.2024.120389","url":null,"abstract":"<div><div>Dust collectors are essential environmental protection equipment in thermal power plants. However, in recent years, collapses caused by excessively high material levels in the ash hopper in dust collectors have increased frequently, resulting in serious casualties and significant economic losses. The level gauge of the ash hopper is a crucial device for detecting the material level in the ash hopper and plays a vital role in preventing the ash hopper from collapsing due to excessive material load. However, level gauges of the ash hopper currently in use have various problems. Laser-ranging technology is characterized by concentrated energy, a small divergence angle, and the ability to penetrate dust. We have proposed a new material-level measurement method based on the dot matrix laser ranging principle. This method utilizes dot-matrix laser ranging and visualizes the optimized measurement data to ultimately derive information about the material surface's morphology and level. A physical hopper model is used to conduct verification experiments on various material surface morphologies, material levels, and the material hanging on the hopper wall. The results indicate that this method can accurately identify the material level and the material hanging on the hopper wall, preventing false alarms due to “false material levels.”</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120389"},"PeriodicalIF":4.5,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536994","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

Manipulating three-dimensional magnetic particles motion in a rotating magnetic field 操纵旋转磁场中的三维磁性粒子运动

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-24 DOI: 10.1016/j.powtec.2024.120391

Jiangang Ku , Jujian Yan , Jun Xia , Zhaolian Wang , Quanxiang Yan , Zhongyun Lei , Qian Wang

引用次数: 0

Powder spreading and spreadability in powder-based additive manufacturing: State of the art and perspectives 基于粉末的增材制造中的粉末铺展和可铺展性：技术现状与前景

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-24 DOI: 10.1016/j.powtec.2024.120393

Wenguang Nan , Lanzhou Ge , Ziming He , Zhonggang Sun , Jinzhong Lu

{"title":"Powder spreading and spreadability in powder-based additive manufacturing: State of the art and perspectives","authors":"Wenguang Nan , Lanzhou Ge , Ziming He , Zhonggang Sun , Jinzhong Lu","doi":"10.1016/j.powtec.2024.120393","DOIUrl":"10.1016/j.powtec.2024.120393","url":null,"abstract":"<div><div>Powder-based additive manufacturing (AM) technology has been widely used in various industries. The powder spreading process and its spreadability play a crucial role in ensuring the quality of the final product and the overall production system. This review aims to provide a comprehensive understanding of the issues related to powder spreading and spreadability in AM, as they significantly impact production consistency, process optimisation, and manufacturing cost reduction. A clear definition of spreadability and its corresponding metrics are presented, and the difference between the spreadability and flowability is also clarified. Meanwhile, the factors influencing the spreadability and spreading process, including the powder mixture and gas atmosphere, are thoroughly reviewed. The underlying mechanisms of these factors are discussed and summarised, particularly the critical spreading speed and the shear band developed in front of the spreader. Furthermore, the defects within the spread layer are carefully classified with a summary of the corresponding causes and mechanisms, in which the importance of particle jamming is clarified. The detection of defects using machine learning and the optimisation of spreadability are also reviewed. Finally, future trends and research opportunities, such as the integration of artificial intelligence into in-situ defect detection and subsequent adjustment of spreading conditions, are highlighted.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120393"},"PeriodicalIF":4.5,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552265","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

Optimizing CO2 capture property of alkali-activated ladle slag materials with sodium dodecyl sulfate 用十二烷基硫酸钠优化碱激活钢包渣材料的二氧化碳捕获特性

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-24 DOI: 10.1016/j.powtec.2024.120388

Binbin Huo , Yamei Zhang , Dongmin Wang

引用次数: 0