Unified description of size effects of transport properties of liquids flowing in nanochannels
Unified description of size effects of transport properties of liquids flowing in nanochannels
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DOI：
10.1016/j.ijheatmasstransfer.2012.05.008
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发表时间：
2012-09-01
影响因子：
5.2
通讯作者：
Liakopoulos, A.
中科院分区：
文献类型：
--
作者：
Giannakopoulos, A. E.;Sofos, F.;Liakopoulos, A.
目前的工作连接简单的流体在纳米通道中流动的传输特性：扩散系数，剪切粘度和热导率。我们使用非平衡分子动力学（NEMD）模拟液氩流动的纳米通道形成的氪壁，宏观上相当于平面Poiquillille流，在恒定的温度。随着沟道宽度的增加，所有性能接近体值。随着沟道宽度的减小，输运性质发生显著变化：扩散系数随沟道宽度减小，剪切粘度随沟道宽度增大，热导率随沟道宽度增大。这项工作的新结果是，如果一个传输特性（比如扩散系数）的尺寸效应是已知的，那么所有其他的都可以从经典流体力学的结果中估计出来。(C)2012爱思唯尔有限公司保留所有权利。
The present work connects transport properties of simple fluids flowing in nanochannels: the diffusion coefficient, the shear viscosity and the thermal conductivity. We used non-equilibrium molecular dynamics (NEMD) simulations of liquid argon flowing in a nanochannel formed by krypton walls, macroscopically equivalent to the planar Poiseuille flow, at constant temperature. All properties approach bulk values as the channel width increases. As the channel width decreases, the transport properties change dramatically: the diffusion coefficient decreases with the channel width, the shear viscosity increases with the channel width and the thermal conductivity increases with the channel width. The novel result of this work is that, if the size effect of one of the transport properties (say the diffusion coefficient) is known, then all the others can be estimated from results that apply to classic fluid mechanics. (C) 2012 Elsevier Ltd. All rights reserved.