Determination of thermal conductivity of interfacial layer in nanofluids by equilibrium molecular dynamics simulation

被引：54
|
作者：
Wang, Xin [1 ,2 ]
Jing, Dengwei [1 ]
机构：
[1] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China
[2] Xi An Jiao Tong Univ, Int Res Ctr Renewable Energy, Xian 710049, Shaanxi, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2019年 / 128卷
基金：
中国国家自然科学基金;
关键词：
Molecular dynamics simulation; Thermal conductivity; Interfacial layer; Nanofluids; Effective medium theory model; ENHANCEMENT; NANOLAYER;
D O I：
10.1016/j.ijheatmasstransfer.2018.08.073
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
In this article, equilibrium molecular dynamics are performed to investigate the thickness and thermal conductivity of interfacial layer around the nanoparticle in dilute nanofluids. A nanofluids system of a 1-nm-diameter copper spherical nanoparticle immersing into argon base liquids and then a flat interface formed by liquid argon on the solid copper surface are studied. Green-Kubo formula is developed to calculate thermal conductivity of interfacial layer. Besides, the effect of solid-liquid interaction is studied. The nano-scale thin interfacial layer with more ordered structure and higher thermal conductivity than that of the base fluids is observed. Then the simulation results are incorporated into the modified Maxwell equation to calculate the effective thermal conductivity of nanofluids. The results indicate that the contribution of interfacial layer to thermal conductivity enhancement of nanofluids can be neglected. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码：199 / 207
页数：9
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