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
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引用次数: 4

摘要

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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Thermal transport during thin-film argon evaporation over nanostructured platinum surface: A molecular dynamics study
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.
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来源期刊
CiteScore
6.00
自引率
1.70%
发文量
24
期刊介绍: Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems is a peer-reviewed scientific journal published since 2004 by SAGE Publications on behalf of the Institution of Mechanical Engineers. The journal focuses on research in the field of nanoengineering, nanoscience and nanotechnology and aims to publish high quality academic papers in this field. In addition, the journal is indexed in several reputable academic databases and abstracting services, including Scopus, Compendex, and CSA's Advanced Polymers Abstracts, Composites Industry Abstracts, and Earthquake Engineering Abstracts.
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