Prediction of the gaseous thermal conductivity in aerogels with non-uniform pore-size distribution

被引:69
作者
Bi, C. [1 ]
Tang, G. H. [1 ]
Tao, W. Q. [1 ]
机构
[1] Xi An Jiao Tong Univ, MOE Key Lab Thermofluid Sci & Engn, Sch Energy & Power Engn, Xian 710049, Peoples R China
基金
中国国家自然科学基金;
关键词
Aerogel; Nano-porous media; Gaseous thermal conductivity; Pore-size distribution; SILICA AEROGEL; INSULATION; GAS;
D O I
10.1016/j.jnoncrysol.2012.08.011
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The gaseous thermal conductivity in nano-porous aerogel is an important contribution to the total thermal conductivity under normal temperature and pressure condition. Pore-size distribution in the aerogel has significant effect on the gaseous thermal conductivity. The pore-size in the porous materials generally presents random and non-uniform distribution, and large deviation will be caused if directly using the mean pore-size to calculate the gaseous thermal conductivity. We present a modified model based on the previous theoretical models to take into account the random and non-uniform pore-size distribution, and the predicted results from the present model are significantly better than those of existing models. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:3124 / 3128
页数:5
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