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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Thermal transport during thin-film argon evaporation over nanostructured platinum surface: A molecular dynamics study
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Thermal transport during thin-film argon evaporation over nanostructured platinum surface: A molecular dynamics study

机译：薄膜氩气在纳米结构铂表面上蒸发过程中的热传输：分子动力学研究

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摘要

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.
机译：已经使用分子动力学模拟研究了薄膜液体在纳米结构表面上的热传递特性，特别是对于不同的壁-流体相互作用强度，纳米结构的影响尤为重要。本文考虑的纳米结构表面包括放置在平坦壁上的壁穿矩形纳米柱。衬底和纳米结构都为铂，而氩气用作蒸发液。已经考虑了两种不同的壁-流体相互作用强度，它们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90 K时达到平衡，然后壁温突然在130 K时升高，这导致堆积在其上的氩气蒸发。通过计算壁热通量和蒸发质量通量，研究了在不同表面润湿条件下传热和传质的比较效果。在这项研究中获得的结果表明，在纳米结构表面的情况下比在平坦表面的情况下更容易发生热传递。已经发现，在蒸发过程中和蒸发过程之后，氩分子行为的差异，即壁吸附特性，取决于表面润湿条件以及纳米结构的存在和构型。能量平衡的热力学方法与目前的分子动力学研究显示出合理的一致性。

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