Effective structure of aerogels and decomposed contributions of its thermal conductivity
Effective structure of aerogels and decomposed contributions of its thermal conductivity
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气凝胶的有效结构及其导热系数的分解贡献
DOI：
10.1016/j.applthermaleng.2014.02.052
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发表时间：
2014-11-05
影响因子：
6.4
通讯作者：
Tao, Wen-Quan
中科院分区：
文献类型：
--
作者：
Dan, Dan;Zhang, Hu;Tao, Wen-Quan
本文在此基础上提出了一种新的有效的模型--球形空心立方体模型。并从理论上推导了气凝胶表观热导率的预测方程。利用该模型对不同类型气凝胶的有效导热系数进行了预测，预测结果与实验数据吻合较好。此外，实验研究了两种纳米多孔材料在不同气压下的热导率。通过分解法得到了气体导热、固体导热和热辐射的贡献。(C)2014爱思唯尔有限公司版权所有。
In this paper, a new effective model, Spherical hollow cube model, is proposed based on the structures. of aerogels and the prediction equation for the apparent thermal conductivity is theoretically derived. The effective thermal conductivity of different types of aerogels is estimated by the present model, and the predicted results are more agreeable with experimental data than that of the previous models. In addition, the thermal conductivity of two nano-porous materials at different gas pressure is investigated experimentally. The contributions of gas conduction, solid conduction and thermal radiation are obtained by decomposition method. (C) 2014 Elsevier Ltd. All rights reserved.