A Molecular Analysis of Critical Factors for Interface and Size Effects on Heat Conduction in Nanoconfined Water Film

  • JIN Lu ,
  • ZHOU Leping ,
  • DU Xiaoze
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  • Key Laboratory of Power Station Energy Transfer Conversion and System Ministry of Education, School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

网络出版日期: 2023-12-01

基金资助

The authors are grateful for the financial supports from the National Natural Science Foundation of China (No. 51876058).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

A Molecular Analysis of Critical Factors for Interface and Size Effects on Heat Conduction in Nanoconfined Water Film

  • JIN Lu ,
  • ZHOU Leping ,
  • DU Xiaoze
Expand
  • Key Laboratory of Power Station Energy Transfer Conversion and System Ministry of Education, School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Online published: 2023-12-01

Supported by

The authors are grateful for the financial supports from the National Natural Science Foundation of China (No. 51876058).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

摘要

由于纳米流体的尺寸、几何形状、界面、温度等因素的影响,纳米流体导热与体材料的导热不尽相同。本研究采用分子动力学方法,系统地分析了影响纳米受限水薄膜热传导的关键因素。随着铜板厚度的减小,纳米受限水薄膜的垂直方向导热系数呈指数衰减,同时热阻、径向分布函数峰值和原子热路径值呈指数增加。通过计算受限液膜的平均键序、径向分布函数、均方位移和振动态密度,分析了液膜中水分子的分子分布、分子扩散和分子振动对热传导的影响,特别是在无氧原子的区域(这是通过近壁密度剖面图观察到的)。结果表明,声子散射是决定这一近壁区域热导率降低的主要因素。受限水薄膜与体材料水的导热系数的热导率之比和近壁区占整个液膜比例的对数成线性关系。界面热阻的大小与膜厚呈正相关,但变化不大。这项工作对进一步了解固体/液体界面附近的水分子对纳米受限流体热传导过程强化的影响提供了见解。

本文引用格式

JIN Lu , ZHOU Leping , DU Xiaoze . A Molecular Analysis of Critical Factors for Interface and Size Effects on Heat Conduction in Nanoconfined Water Film[J]. 热科学学报, 2022 , 31(4) : 1155 -1166 . DOI: 10.1007/s11630-022-1600-2

Abstract

Heat conduction of nanoconfined liquid may differ from its bulk because of the effects of size, geometry, interface, temperature, etc. In this study, the roles of some critical factors for the heat conduction of nanoconfined water film are systematically analyzed by using the molecular dynamics method. With decreasing thickness, the normal thermal conductivity of nanoconfined water film between two copper plates decreases exponentially, while the thermal resistance, peak of the radial distribution function, and atomistic heat path increase exponentially. The average bond order, radial distribution function, mean squared displacement, and vibrational density of states are calculated to analyze the effects of structure, distribution, molecular diffusion, and vibration of water molecules on heat conduction especially in a region having no oxygen atoms (which is observed by the near-wall density profile). The results show that phonon scattering is dominant for determining the reduced thermal conductivity in this near-wall region. The thermal conductivity ratio of confined water film to bulk water has a roughly linear relationship with the logarithm of the proportion of the near-wall region. Moreover, the high interfacial thermal resistance is positively correlated to the film thickness, but it has a negligible impact on heat conduction. This work provides insights into the contribution of water molecules near the solid/liquid interface to the heat conduction of nanoconfined liquid for process intensification.

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