Energy Transport in Multiphase System
Energy Transport in Multiphase System
复制标题
多相系统中的能量传输
DOI：
10.1143/jpsj.72.1049
复制
发表时间：
2003
影响因子：
1.7
通讯作者：
N. Ito
中科院分区：
文献类型：
--
作者：
T. Murakami;T. Shimada;S. Yukawa;N. Ito
使用分子动力学模拟研究非平衡能量传输现象。该系统由硬核颗粒组成，两端与热浴接触：左端热，右端冷。对于流体，正常（傅里叶型）热传导在三维系统中再现，但在低维系统中观察不到。在固液共存状态下，各相之间的能量传输性质不同。再现了傅里叶型热传导，但固相的热导率比流体相大。当在热端引起流体动力剪切时，流体相的温度分布是抛物线形，而固相的温度分布是直线形。这些结果表明，连续介质描述可适用于更短的长度尺度（例如微米或纳米尺度技术），相反，此类尺度系统中的分子动力学方法可用于研究非平衡宏观现象。
Nonequilibrium energy transport phenomena are studied using molecular dynamics simulation. The system is made of hard-core particles which contact with the heat baths at the both ends: hot at left end, and cold at right end. In case of fluid, normal (Fourier-type) heat conduction is reproduced in three-dimensional system, but it is not observed in lower-dimensional systems. In solid–fluid coexisting state, the property of energy transport is different between each phase. Fourier-type heat conduction is reproduced, but the solid phase has larger thermal conductivity than the fluid phase. When hydrodynamic shear is induced at hot end, temperature profile of fluid phase is parabolic form but that of solid phase is straight one. These results suggest that continuum description can be applicable to much shorter length scales (for example, micrometer- or nanometer-scale technology) and in contrast, molecular dynamics approach in such scale systems can be used to study nonequilibrium macroscopic phenomena.