A composite theoretical model for the thermal conductivity of nanocrystalline materials

被引：2
|
作者：
Liu, Yingguang [1 ]
Yan, Jie [1 ]
Dan, Yaru [1 ]
机构：
[1] North China Elect Power Univ, Sch Energy & Power Engn, Dept Power Engn, Baoding 071003, Peoples R China
来源：
JOURNAL OF NANOPARTICLE RESEARCH | 2018年 / 20卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Thermal conductivity; Grain size; Transmission; Compositematerial; Nanoscalemodeling and simulation; KAPITZA RESISTANCE; GRAIN-SIZE;
D O I：
10.1007/s11051-018-4294-3
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
In order to study the thermal conductivity of nanocrystalline (NC) materials, a two-phase composite model consisting of grain interior (GI) regarded as an ordered crystal phase and plastically softer grain boundary-affected zone (GBAZ) phase was presented. The effects of GI and GBAZ on thermal conduction were considered, respectively. In this work, time independent Schrodinger's wave equation (TISWE) was used to study the carriers' transmission in a crystal particle, through which we can get the thermal conductivity of the GBAZ. The thermal conductivity of GI was calculated based on a kinetic theory. The whole effective grain thermal conductivity was simulated by a modified formula for composite materials. The results showed that as the grain size decreases to 80 nm, it has a strong size effect, and the thermal conductivity decreases with the decreasing of grain size.
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页数：8
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