Molecular Dynamics Simulations on Heat Conduction in Nano-porous Si

被引：0

作者：

Nagai, Daisuke ^{[1
]}

Miyazaki, Koji ^{[2
]}

Tsukamoto, Hiroshi ^{[3
]}

机构：

[1] Kyushu Inst Technol, Dept Biol Funct & Engn, Kitakyushu, Fukuoka, Japan

[2] Kyushu Inst Technol, Dept Mech & Control Engn, Kitakyushu, Fukuoka, Japan

[3] Kitakyushu Natl Coll Technol, Kitakyushu, Fukuoka, Japan

来源：

HEAT TRANSFER-ASIAN RESEARCH | 2013年 / 42卷 / 03期

关键词：

heat conduction; porous media; phonon;

D O I：

10.1002/htj.20370

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

We investigated heat conduction in a nano-porous silicon by molecular-dynamics simulations (MDs). We calculated the phonon dispersion curves of the nanostructured Si to understand the effects of nano-structures on phonon properties, such as phonon group velocity and phonon density of states. The dispersion curves were calculated from MD's results by using the 2D time-space Fourier transformation. Frequency gaps in phonon dispersion curves reduce the phonon group velocity in the periodic nano-porous structures. Moreover the group velocity of phonon was reduced due to new phonon modes even though the nano-porous was random. The results showed that nano-porous structures reduce the thermal conductivity as well as super lattices. (C) 2011 Wiley Periodicals, Inc.

引用

页码：274 / 280

页数：7

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