Molecular dynamics simulation on effects of nanostructure on interfacial thermal resistance during condensation
Molecular dynamics simulation on effects of nanostructure on interfacial thermal resistance during condensation
复制标题
DOI：
10.1299/jtst.2020jtst0010
复制
发表时间：
2020
影响因子：
1.2
通讯作者：
Akito Fujii;K. Fujiwara;Y. Ueki;M. Shibahara
中科院分区：
文献类型：
--
作者：
Akito Fujii;K. Fujiwara;Y. Ueki;M. Shibahara
相变传热应用于各个工业领域，例如发电工业、空调系统和电子设备的冷却。在上述工业装置中，冷凝是重要的过程之一，从热效率的角度来看，冷凝过程中传热系数的提高对我们有利。在固体表面冷凝的情况下，众所周知，通过改变冷凝表面的物理和化学性质来改变冷凝传热系数，并且已经报道了通过在传热表面上设计纳米和微米结构图案来增强冷凝传热系数（Chen等，2011；Miljikovic等，2013；Hou等，2015）。然而，关于结构如何影响冷凝过程中的能量传递的一般知识有限。为了理解附着在传热表面的纳米尺度结构（纳米结构）在冷凝过程中的作用，分子动力学的观点是必要的，因为在冷凝传热现象的初始阶段，分子尺度的冷凝发生在纳米尺度的表面上。在此之前，已经开展了许多研究来估计分子尺度的传热（Kimura和Maruyama，2002；Vera和Yildiz，2015）以及冷凝过程中纳米结构对传热表面的影响（Uno等，2016，2018；Gao等，2019）。然而，很少有研究研究纳米结构的局部片段对冷凝过程中传热表面的影响。因此，我们研究了纳米结构表面各段的冷凝行为和传热机理，这将成为具有最佳纳米结构图案的传热表面的详细设计的基础，从而实现高冷凝传热系数。在这项研究中，我们特别关注具有长方体结构的固体表面上的冷凝行为和冷凝过程中的局部传热。经典分子动力学 Akito FUJII*、Kunio FUJIWARA*、Yoshitaka UEKI* 和 Masahiko SHIBAHARA* *Graduate School of Engineering, Osaka University 2-1 Yamadoka, Suita, Osaka 565-0871, Japan 电子邮件：fujii.akito.mte@gmail.com 收稿日期：2020 年 3 月 17 日；修订日期：2020 年 5 月 11 日；接受日期：2020 年 6 月 1 日
Heat transfer with phase change is applied in various industrial fields such as power generation industry, air conditioning systems and cooling of electronic devices. In the above mentioned industrial devices, condensation is one of the important processes, and the enhancement of heat transfer coefficients in condensation processes benefits us from a thermal efficiency point of view. In the case of condensation on a solid surface, it is known that condensation heat transfer coefficients change through the modification of physical and chemical properties of condensation surface, and the enhancements of condensation heat transfer coefficient by designed nano and micro structure pattern on a heat transfer surface have been reported (Chen et al., 2011; Miljikovic et al., 2013; Hou et al., 2015). However, there is limited general knowledge on how the structures influence energy transfer during the condensation. In order to understand the effects of the structures at the nanometer scale (nanostructures) attached to a heat transfer surface in the condensation processes, a molecular dynamics point of view is necessary because the molecular-scale condensation occurs on a surface at the nanometer scale at the initial stage of the condensation heat transfer phenomena. Before now, a number of studies have been carried out to estimate the heat transfer of molecular scale (Kimura and Maruyama, 2002; Vera and Yildiz, 2015) and the effects of the nanostructures on the heat transfer surface during condensation (Uno et al., 2016, 2018; Gao et al., 2019). However, there were few researches which investigated the effect of the local segment of the nanostructure on the heat transfer surface during condensation. Therefore, we investigated the condensation behavior and heat transfer mechanism in each segment of the surface with the nanostructure, which would be the basis of the detailed design of the heat transfer surface with the optimal nanostructured pattern which realizes high condensation heat transfer coefficient. In this study, we especially focused on the condensation behaviors and the local heat transfer in condensation processes on a solid surface with a cuboid structure. The classical molecular dynamics Akito FUJII*, Kunio FUJIWARA*, Yoshitaka UEKI* and Masahiko SHIBAHARA* *Graduate School of Engineering, Osaka University 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan E-mail: fujii.akito.mte@gmail.com Received: 17 March 2020; Revised: 11 May 2020; Accepted: 1 June 2020