Archive of Mechanical Engineering最新文献_第7页

The advantage of using the microcontroller PIC18F4455 as a control tool for a band saw 使用PIC18F4455单片机作为带锯控制工具的优点

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2008.131624

J. Wojnarowski, B. Borowik

引用次数: 0

Acoustic screen structures, their properties for noise and vibration reduction 声屏结构及其减振降噪性能

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2007.131553

D. Guzas, R. Klimas, V. Tricys

引用次数: 0

Numerical analysis of modified fanwing concept 改进扇翼概念的数值分析

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2009.132105

K. Kurec, J. Piechna

引用次数: 0

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

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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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

Electrical discharge machining of difficult to cut materials 电火花加工难切削材料

Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2018.125437

Rafał Świercz, Dorota Oniszczuk-Świercz, Lucjan Dąbrowski

引用次数: 12