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Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems最新文献

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Thermal transport during thin-film argon evaporation over nanostructured platinum surface: A molecular dynamics study 纳米结构铂表面薄膜氩蒸发过程中的热输运:分子动力学研究
M. Hasan, S. M. Shavik, K. F. Rabbi, K. M. Mukut, M. Alam
Investigation of thermal transport characteristics of thin-film liquid evaporation over nanostructured surface has been conducted using molecular dynamics simulation with particular importance on the effects of the nanostructure configuration for different wall–fluid interaction strengths. The nanostructured surface considered herein comprises wall-through rectangular nanoposts placed over a flat wall. Both the substrate and the nanostructure are of platinum while argon is used as the evaporating liquid. Two different wall–fluid interaction strengths have been considered that essentially emulate both hydrophilic and hydrophobic wetting conditions for three different nanostructure configurations. The argon–platinum molecular system is first equilibrated at 90 K and then followed by a sudden increase in the wall temperature at 130 K that induces evaporation of argon laid over it. Comparative effectiveness of heat and mass transfer for different surface wetting conditions has been studied by calculating the wall heat flux and evaporative mass flux. The results obtained in this study show that heat transfer occurs more easily in cases of nanostructured surfaces than in case of flat surface. Difference in behavior of argon molecules during and after the evaporation process, that is, wall adsorption characteristics, has been found to depend on the surface wetting condition as well as on presence and configuration of nanostructure. A thermodynamic approach of energy balance shows reasonable agreement with the present molecular dynamics study.
利用分子动力学模拟研究了薄膜液体蒸发在纳米结构表面上的热输运特性,特别重视纳米结构构型对不同壁流相互作用强度的影响。本文所考虑的纳米结构表面包括放置在平壁上的穿过墙壁的矩形纳米柱。衬底和纳米结构均为铂,蒸发液为氩气。考虑了两种不同的壁-流体相互作用强度,基本上模拟了三种不同纳米结构配置的亲水和疏水润湿条件。氩-铂分子系统首先在90k时达到平衡,然后在130k时壁温突然升高,导致放置在其上的氩蒸发。通过计算壁面热流密度和蒸发质量流密度,研究了不同表面润湿条件下传热传质效果的比较。研究结果表明,纳米结构表面的传热比平面表面的传热更容易发生。在蒸发过程中和蒸发后氩分子的行为差异,即壁面吸附特性,不仅取决于表面润湿条件,还取决于纳米结构的存在和配置。能量平衡的热力学方法与目前的分子动力学研究结果基本一致。
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引用次数: 4
Unsteady electromagnetic radiative nanofluid stagnation-point flow from a stretching sheet with chemically reactive nanoparticles, Stefan blowing effect and entropy generation 非定常电磁辐射纳米流体在具有化学反应纳米颗粒的拉伸片上的滞点流动、Stefan吹气效应和熵生成
P. Rana, N. Shukla, O. Bég, A. Kadir, Bani Singh
This article investigates the combined influence of nonlinear radiation, Stefan blowing and chemical reactions on unsteady electro-magneto-hydrodynamic stagnation-point flow of a nanofluid from a horizontal stretching sheet. Both electrical and magnetic body forces are considered. In addition, the effects of velocity slip, thermal slip and mass slip are considered at the boundaries. An analytical method named as homotopy analysis method is applied to solve the non-dimensional system of nonlinear partial differential equations which are obtained by applying similarity transformations on governing equations. The effects of emerging parameters such as Stefan blowing parameter, electric parameter and magnetic parameter on the important physical quantities are presented graphically. In addition, an entropy generation analysis is provided in this article for thermal optimization. The flow is observed to be accelerated both with increasing magnetic field and electrical field. Entropy generation number is markedly enhanced with greater magnetic field, electrical field and Reynolds number, whereas it is reduced with increasing chemical reaction parameter.
本文研究了非线性辐射、Stefan吹气和化学反应对水平拉伸片纳米流体非定常电磁流体滞点流动的综合影响。考虑了电体力和磁体力。此外,在边界处考虑了速度滑移、热滑移和质量滑移的影响。采用同伦分析方法求解由控制方程相似变换得到的非线性偏微分方程组的无量纲系统。以图形的形式给出了风机参数、电参数、磁参数等新兴参数对重要物理量的影响。此外,本文还对热优化进行了熵产分析。观察到,随着磁场和电场的增大,流动速度加快。熵产数随磁场、电场和雷诺数的增大而增大,随化学反应参数的增大而减小。
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引用次数: 28
Role of magnetic field on mixed convective flow between two concentric microtubes with heat generation/absorption: An exact solution 磁场对两根具有产热/吸热的同心微管间混合对流流动的作用:精确解
B. Jha, M. Oni
This study examines the role of magnetic field on fully developed mixed convection flow of heat generating/absorbing fluid in a vertical micro-concentric annulus with velocity slip and temperature jump at the surfaces of the cylinders. Exact solution of momentum and energy equations are obtained separately in terms of Bessel’s function and modified Bessel’s function of first and second kind. The solutions obtained are graphically represented and the effects of pertinent parameters on flow formation and skin-friction are investigated in details. Results show that the role of magnetic field is to decrease fluid velocity as well as skin-friction at the outer surface of inner cylinder. In addition, reverse flow formation can be controlled by increasing magnetic field strength.
本文研究了磁场对垂直微同心环空中生热/吸热流体充分发展的混合对流流动的作用,并考察了圆柱表面的速度滑移和温度跳变。分别用第一类贝塞尔函数和第二类修正贝塞尔函数求得了动量方程和能量方程的精确解。用图形表示了得到的解,并详细研究了相关参数对流动形成和摩擦的影响。结果表明,磁场的作用是降低流体速度和内缸外表面的摩擦。此外,可以通过增加磁场强度来控制逆流的形成。
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引用次数: 10
Modeling creep behavior of carbon nanotube/fiber/polymer composite cylinders 碳纳米管/纤维/聚合物复合材料圆柱体蠕变行为建模
A. Ghasemi, Komeil Hosseinpour, M. Mohandes
In this research, the effects of multi-walled carbon nanotubes on the distribution of long-term creep strains in thick-walled multi-walled carbon nanotube/fiber/polymer three-phase laminated composites are studied. In the first step, micromechanical models are developed to calculate the elastic properties of multi-walled carbon nanotube/vinylester and multi-walled carbon nanotube/E-glass fiber/vinylester composites. Using classical lamination plate theory, equilibrium and compatibility equations and strain–displacement relations, the distribution of effective stresses is considered. Moreover, utilizing Schapery single-integral model for nonlinear viscoelastic materials, Prandtl–Reuss relations and Mendelson’s approximation method, not only the distribution of circumferential and radial strains is investigated but also the effects of fiber orientation and weight fraction (wt.%) of the multi-walled carbon nanotubes on the way of distribution are studied. The results demonstrated that the addition of the multi-walled carbon nanotube to the vinylester can reduce absolute values of the radial and circumferential creep strains and dimensionless effective stresses. Moreover, most reduction occurred in the inner wall of the cylindrical shell when fiber orientation was α = 90°.
在本研究中,研究了多壁碳纳米管对厚壁多壁碳纳米管/纤维/聚合物三相层合复合材料长期蠕变应变分布的影响。首先,建立了微力学模型,计算了多壁碳纳米管/乙烯基材料和多壁碳纳米管/ e -玻璃纤维/乙烯基材料的弹性性能。利用经典层合板理论、平衡相容方程和应变-位移关系,研究了层合板的有效应力分布。此外,利用非线性粘弹性材料的Schapery单积分模型、Prandtl-Reuss关系和Mendelson近似方法,研究了多壁碳纳米管的周向和径向应变分布,以及纤维取向和重量分数(wt.%)对多壁碳纳米管分布方式的影响。结果表明,在乙烯基材料中加入多壁碳纳米管可以降低其径向和周向蠕变应变的绝对值以及无因次有效应力。当纤维取向为α = 90°时,最大的衰减发生在圆柱壳的内壁。
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引用次数: 7
Mechanism analyzation of the effects of grating parameters on polarization transmission of single-layer nanowire gratings 光栅参数对单层纳米线光栅偏振透射影响的机理分析
Wang Zhiwen, Gong Jinliang, Dong Aimei, Cui Bo
Using equivalent medium theory, surface plasma resonance theory and Fabry–Pérot resonance theory, transmission mechanism of single-layer nanowire polarizer is systematically analyzed. Concept of skin depth is used to explain the effect of grating material on polarization transmission. Two transmission minimum points in the curve of grating period versus transverse magnetic transmission are analyzed quantitatively. Effects of grating duty cycle, height and type on polarization transmission of single-layer nanowire polarizer are also analyzed. The requirements of designing single-layer sub-wavelength metal gratings with good polarization properties are given. The analysis of the transmission mechanism of sub-wavelength metal gratings will be helpful for the design and fabrication of the gratings with good polarization properties.
利用等效介质理论、表面等离子体共振理论和fabry - psamro共振理论,系统分析了单层纳米线偏振器的传输机理。采用趋肤深度的概念来解释光栅材料对偏振透射的影响。定量分析了光栅周期与横向磁透射曲线上的两个最小透射点。分析了光栅占空比、高度和类型对单层纳米线偏振器偏振透射率的影响。给出了设计具有良好偏振特性的单层亚波长金属光栅的要求。分析亚波长金属光栅的透射机理,有助于设计和制造具有良好偏振特性的金属光栅。
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引用次数: 3
Magneto-hydrodynamic Blasius flow and heat transfer from a flat plate in the presence of suspended carbon nanofluids 悬浮碳纳米流体存在下的平板磁流体动力学Blasius流和传热
M. Nandeppanavar, R. S. Reddy Gorla, S. Shakunthala
In this article, we have discussed the effect of external magnetic field and other governing parameters on the flow and heat transfer in the presence of suspended carbon nanotubes over a flat plate. The governing equations of flow and heat transfer are derived from the Navier–Stokes and Prandtl boundary layer concept. The derived governing equations of flow and energy are non-linear partial differential equation, and these equations are converted into non-linear ordinary differential equations with corresponding boundary conditions using some suitable similarity transformations and are solved numerically using fourth-order Runge–Kutta method with efficient shooting technique. Effects of governing parameters on flow and heat transfer are shown through various graphs and explained with physical interpretation in detail. This study has applications in glass-fiber production and technology. On observing the results of this study, we can conclude that external magnetic field shows opposite behaviors on velocity and temperature and it enhances the rate of heat transfer.
在本文中,我们讨论了外磁场和其他控制参数对悬浮碳纳米管在平板上的流动和传热的影响。流动和传热的控制方程是由Navier-Stokes和Prandtl边界层概念导出的。导出的流动和能量控制方程为非线性偏微分方程,采用适当的相似变换将其转化为具有相应边界条件的非线性常微分方程,并采用四阶龙格-库塔法进行数值求解。通过各种图形显示控制参数对流动和传热的影响,并用物理解释详细说明。本研究在玻璃纤维生产和工艺方面具有一定的应用价值。通过观察本研究的结果,我们可以得出结论,外磁场对速度和温度表现出相反的行为,并提高了换热速率。
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引用次数: 10
Editorial for JNNN JNNN社论
J. McGeough
{"title":"Editorial for JNNN","authors":"J. McGeough","doi":"10.1177/2397791418761251","DOIUrl":"https://doi.org/10.1177/2397791418761251","url":null,"abstract":"","PeriodicalId":44789,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems","volume":null,"pages":null},"PeriodicalIF":6.0,"publicationDate":"2018-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82742441","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
Integrated, multidisciplinary approaches for micro-manufacturing research, and new opportunities and challenges to micro-manufacturing 集成、多学科的微制造研究方法,以及微制造的新机遇和挑战
Y. Qin
Increased demands on micro-products and miniaturised systems/devices have been a main driver to the rapid growth of the interest in research in micro- and nano-manufacturing. Currently, micro-manufacturing research is bridging ‘nano-manufacturing’ and ‘macro-manufacturing’ and hence, helping to transform nanotechnology into real-world and affordable products, for which it is developing multi-length scale and multi-materials manufacturing capabilities. It is also playing more roles in helping transforming traditional industry and products to more competitive ones. Nevertheless, besides being shifted from ‘process focus’ to ‘market/product’ driven research and technological developments addressing production capability, product quality, pilot production lines and sustainability, there is clearly a need for micro-manufacturing research to adopt integrated, multidisciplinary approaches to address development-related issues concurrently, in order to shorten the development cycles for product realisation. It is believed that to transfer laboratory processes to industrial applications within much shorter timescales, the associated issues should be addressed with collaborations among different, relevant disciplines. European Union–funded integrated projects have demonstrated such efforts. Product development–centred approaches brought in expertise and resources in product design, material, analysis, testing, tools, machines, automation and manufacturing system integration as well as in life-cycle engineering to address the development needs. At the same time, due to ever updated interests in new products and enabling manufacturing technologies with a view to meeting increased demands from, for example, healthcare, on quality of life, for wealth creation, social engagement and sustainable development, there are new challenges to micro- and nano-manufacturing research, which also suggest tremendous opportunities.
对微型产品和小型化系统/设备的需求增加是微纳米制造研究兴趣快速增长的主要驱动力。目前,微制造研究是“纳米制造”和“宏观制造”的桥梁,因此,有助于将纳米技术转化为现实世界和负担得起的产品,为此,它正在开发多长度规模和多材料制造能力。在帮助传统产业和产品向更具竞争力的方向转变方面,中国也发挥着更大的作用。然而,除了从“工艺重点”转向“市场/产品”驱动的研究和技术开发,解决生产能力、产品质量、试点生产线和可持续性问题外,微制造研究显然需要采用综合的多学科方法来同时解决与开发相关的问题,以缩短产品实现的开发周期。人们认为,要在更短的时间内将实验室过程转化为工业应用,应通过不同相关学科之间的合作来解决相关问题。欧洲联盟资助的综合项目已经证明了这种努力。以产品开发为中心的方法带来了产品设计、材料、分析、测试、工具、机器、自动化和制造系统集成以及生命周期工程方面的专业知识和资源,以满足开发需求。与此同时,由于人们对新产品和制造技术的兴趣不断更新,以满足医疗保健、生活质量、财富创造、社会参与和可持续发展等方面日益增长的需求,因此微观和纳米制造研究面临新的挑战,这也意味着巨大的机遇。
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引用次数: 6
Fabrication and characterization of polymethyl methacrylate microchannel using dry and underwater CO2 laser 干式和水下CO2激光制备聚甲基丙烯酸甲酯微通道及表征
Mohamed O. Helmy, Ahmed M. R. Fath El-Bab, H. El-Hofy
Over the last few decades, miniaturization has become the key aspect of driving evolution of modern technology. The CO2 laser is an inexpensive, flexible, and fast device for fabricating microfluidic chips. Thermal damages associated with such a process are considered the big challenge for microfluidic device developers. This article evaluates the quality of polymethyl methacrylate microchannels fabricated by the CO2 laser. Experiments were conducted in the air (dry) and underwater by leaving a thin water layer on the top surface of the polymethyl methacrylate substrate. The effect of laser power and scanning speed on performance characteristics, such as the microchannel aspect ratio, surface roughness, and heat-affected zone was studied. Taguchi’s experimental design with grey relational analysis was used for multi-objective optimization of the laser micromachining parameters. Analysis of variance was also employed to determine the most significant control factors that affect the microchannel quality. The results indicated that the cooling effect of the underwater method has a significant effect on decreasing the extent of thermal damage while increasing the aspect ratio. Laser power is the most significant factor on the performance characteristics followed by scanning speed and pulse rate. Grey relational analysis is efficient in selecting the optimum conditions regarding the performance characteristics.
在过去的几十年里,小型化已经成为推动现代技术发展的关键因素。CO2激光器是一种廉价、灵活、快速的微流控芯片制造设备。与此过程相关的热损伤被认为是微流体器件开发人员面临的最大挑战。本文对CO2激光制备的聚甲基丙烯酸甲酯微通道的质量进行了评价。实验是在空气(干燥)和水下进行的,在聚甲基丙烯酸甲酯基板的上表面留下一层薄薄的水层。研究了激光功率和扫描速度对微通道宽高比、表面粗糙度和热影响区等性能特性的影响。采用田口试验设计与灰色关联分析法对激光微加工参数进行多目标优化。方差分析还用于确定影响微通道质量的最显著控制因素。结果表明,水下方法的冷却效果对减小热损伤程度、增大展弦比有显著效果。激光功率是影响其性能的最重要因素,其次是扫描速度和脉冲速率。灰色关联分析可以有效地根据性能特征选择最优条件。
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引用次数: 9
Al/SiCNP and Al/SiCNP/X nanocomposites fabrication and properties: A review Al/SiCNP和Al/SiCNP/X纳米复合材料制备及性能研究进展
A. Reddy, P. Krishna, R. Rao
Global requirement for minimum cost, high efficiency, and good grade materials has made a diversion in research from base alloys to composite materials, since the last five decades. In the case of metal matrix composites, aluminium metal matrix composites have been certified and steadily advanced due to properties such as high strength, low density, and high wear resistance. They are widely used in automobile industry, aircraft industry, structural applications, and many other defence systems. Researchers have observed that the addition of nano-size SiCNP reinforcements to aluminium-based matrix yields superior properties and good bonding characteristics between matrix and reinforcements of nanocomposites. Along with silicon carbide particulate primary nano-reinforcements, researchers studied the properties of aluminium metal matrix nanocomposites with the addition of secondary reinforcements. These hybrid nanocomposites exhibited improved wear resistance. This article reviews the fabrication methods, mechanical properties, and tribological properties of aluminium-based hybrid metal matrix nanocomposites.
在过去的五十年里,全球对低成本、高效率和优质材料的需求使研究从基合金转向复合材料。在金属基复合材料方面,铝金属基复合材料由于具有高强度、低密度和高耐磨性等特性而得到了认证并稳步发展。它们广泛应用于汽车工业、航空工业、结构应用和许多其他防御系统。研究人员观察到,在铝基基体中添加纳米尺寸的SiCNP增强剂可以获得优异的性能,并且在基体和增强剂之间具有良好的结合特性。在碳化硅颗粒一级纳米增强剂的基础上,研究了二次增强剂对铝基纳米复合材料性能的影响。这些杂化纳米复合材料表现出更好的耐磨性。本文综述了铝基杂化金属基纳米复合材料的制备方法、力学性能和摩擦学性能。
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引用次数: 22
期刊
Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems
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