Archive of Mechanical Engineering最新文献_第9页

Evaluation of skull bone structures in CT imaging 颅骨结构的CT成像评价

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2019.126373

Andrzej Ryniewicz, Wojciech Ryniewicz, Stanisław Wyrąbek, Łukasz Bojko

引用次数: 0

Application of comparative design study in the development of preservation encasements for historical documents 比较设计研究在历史文献保护地开发中的应用

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.138394

Alejandro C. Ramirez-Reivich, Ma. Pilar Corona-Lira, Diego A. Zamora-Garcia, Anahí Velazquez-Silva, Vicente Borja

引用次数: 0

131708 131708

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2020.131708

引用次数: 0

Wear and surface characteristics on tool performance with CVD coating of Al2O3/TiCN inserts during machining of Inconel 718 alloys Al2O3/TiCN CVD涂层加工Inconel 718合金时刀具磨损及表面特征

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.139647

引用次数: 1

Hybrid nano improved phase change material for latent thermal energy storage system: Numerical study 用于潜热储能系统的混合纳米改进相变材料:数值研究

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2022.140410

{"title":"Hybrid nano improved phase change material for latent thermal energy storage system: Numerical study","authors":"","doi":"10.24425/ame.2022.140410","DOIUrl":"https://doi.org/10.24425/ame.2022.140410","url":null,"abstract":"The phase change materials (PCM) are widely used in several applications, especially in the latent heat thermal energy storage system (LHTESS). Due to the very low thermal conductivity of PCMs. A small mass fraction of hybrid nanoparticles TiO 2 –CuO (50%–50%) is dispersed in PCM with ﬁve mass concentrations of 0%, 0.25%, 0.5%, 0.75% and 1 mass % to improve its thermal conductivity. This article is focused on thermal performance of the hybrid nano-PCM (HNPCM) used for the LHTESS. A numerical model based on the enthalpy-porosity technique is developed to solve the Navier-Stocks and energy equations. The computations were conducted for the melting and solidiﬁcation processes of the HNPCM in a shell and tube latent heat storage (LHS). The developed numerical model was validated successfully with experimental data from the literature. The results showed that the dispersed hybrid nanoparticles improved the eﬀective thermal conductivity and density of the HNPCM. Accordingly, when the mass fraction of a HNPCM increases by 0.25%, 0.5%, 0.75% and 1 mass %, the average charging time improves by 12.04 %, 19.9 %, 23.55%, and 27.33 %, respectively. Besides, the stored energy is reduced by 0.83%, 1.67%, 2.83% and 3.88%, respectively","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"1990 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135636096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Numerical analysis of structure, stability and entropy generation in biogas coflow diffusion flames 沼气共流扩散火焰结构、稳定性及熵产的数值分析

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.139648

{"title":"Numerical analysis of structure, stability and entropy generation in biogas coflow diffusion flames","authors":"","doi":"10.24425/ame.2021.139648","DOIUrl":"https://doi.org/10.24425/ame.2021.139648","url":null,"abstract":"Biogas is a gaseous biofuel predominantly composed of methane and carbon-dioxide. Stability of biogas ﬂames strongly depend upon the amount of carbon-dioxide present in biogas, which varies with the source of biomass and reactor. In this paper, a comprehensive study on the stability and ﬂame characteristics of coﬂow biogas diﬀusion ﬂames is reported. Numerical simulations are carried out using reactive ﬂow module in OpenFOAM, incorporated with variable thermophysical properties, Fick’s and Soret diﬀusion, and short chemical kinetics mechanism. Eﬀects of carbon-dioxide content in the biogas, temperatures of the fuel or coﬂowing air streams (preheated reactant) and hydrogen addition to fuel or air streams are analyzed. Entropy generation in these ﬂames is also predicted. Results show that the ﬂame temperature increases with the degree of preheat of reactants and the ﬂames show better stability with the preheated air stream. Preheating the air contributes to increased ﬂame stability and also to a signiﬁcant decrease in entropy generation. Hydrogen addition, contributing to the same power rating, is seen to be relatively more eﬀective in increasing the ﬂame stability when added to the fuel stream. Results in terms of ﬂow, temperature, species and entropy ﬁelds, are used to describe the stability and ﬂame characteristics.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"396 2‐3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135636328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of thermal performance factor for solar air heaters with artificially roughened channels 人工粗糙通道太阳能空气加热器的热性能系数评价

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.137048

{"title":"Evaluation of thermal performance factor for solar air heaters with artificially roughened channels","authors":"","doi":"10.24425/ame.2021.137048","DOIUrl":"https://doi.org/10.24425/ame.2021.137048","url":null,"abstract":"Heat transfer augmentation has become the utmost industrial desire. Turbulence promoters seems to be a better option for better heat transfer but at the expense of enormous pressure drop. In the current study, experimental optimization of heat transfer and pressure drop in various conﬁgurations of ribbed and corrugated surfaces on the bottom wall of the Solar Air Heater channel, having aspect ratio of 26:5 was performed. The results were evaluated in terms of enhancement in heat transfer (Nu/Nu s ) , friction factor ratio ( f / f s ) and thermal performance factor ( η ) . Three diﬀerent cases and nine conﬁgurations with a pitch to rib/corrugation height ratio of 4.0 were studied. Case A consists of a smooth, continuous square rib, inline and staggered broken ribs. Case B comprises 30 ◦ , 45 ◦ , 60 ◦ and 90 ◦ trapezoidal corrugated geometries while case C is the comparison of smooth, wavy corrugated and the best conﬁgurations of cases A and B. The results show that rectangular duct with staggered broken ribs and trapezoidal corrugation at 45 ◦ are the best conﬁgurations for case A and B, respectively. The 45 ◦ corrugated conﬁguration is the best one amongst all, with values of 1.53, 1.5 and 1.33% for Nu/Nu s , f / f s and η respectively.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"1974 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135637097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Stress and deformation states in single-coil inductors used for pipe calibration by means of electrodynamic method 用电动力学方法标定管道用单线圈电感的应力和变形状态

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2007.131562

J. Bednarczyk

引用次数: 0

Wheelchair mechanism for negotiating obstacles 轮椅机构，用于越过障碍

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2009.132100

J. Bałchanowski, J. Szrek, S. Wudarczyk

引用次数: 2

An improvement of a hydraulic self-climbing formwork 液压自爬模板的改进

IF 0.7

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/AME.2019.131419

V. Nguyen, Kiem Anh Nguyen, V.-L. Nguyen

{"title":"An improvement of a hydraulic self-climbing formwork","authors":"V. Nguyen, Kiem Anh Nguyen, V.-L. Nguyen","doi":"10.24425/AME.2019.131419","DOIUrl":"https://doi.org/10.24425/AME.2019.131419","url":null,"abstract":"Nowadays, self-climbing formworks are commonly used in the construction of concrete buildings with a great height, such as high-rise buildings, silos, and bridge piers. A regular formwork can be improved to have more functions, e.g., the formwork itself can climb to the desired construction site. Climbing characteristics of the formwork as well as opening and closing characteristics of the formwork shell are essential criteria for evaluating the performance of a self-climbing formwork. The effective ones were mentioned in different studies, where most of them were published in patents of countries, e.g., the United States and China. Dissimilar from these studies, this paper presents several improvements for some certain groups to enhance the features of a hydraulic self-climbing formwork. Based on the analysis of the composition and the working principle of the actual climbing formwork types, a new opening and closing method of the formwork shells and a new rail clamping device are suggested. They are applied to design a self-climbing formwork with the shell’s working size of 4 m × 3 m. Their load capacity, as well as the flatness of the concrete surface after casting, are assessed. The proposed solutions can result in various advantages, e.g., the shorter initial alignment time, the increase of the quality concrete surface, and the maximal automation for construction operations.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68944898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5