Advances of thermal conductivity models of nanoscale silica aerogel insulation material
Advances of thermal conductivity models of nanoscale silica aerogel insulation material
复制标题
纳米二氧化硅气凝胶绝热材料导热模型研究进展
DOI：
10.1016/j.applthermaleng.2015.02.013
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发表时间：
2015-04-25
影响因子：
6.4
通讯作者：
Xie, Tao
中科院分区：
文献类型：
--
作者：
He, Ya-Ling;Xie, Tao
综述了纳米多孔二氧化硅气凝胶隔热材料有效导热系数模型的研究进展。首先，介绍了气凝胶材料内部的纳米尺度换热特性。其次，对现有的纳米尺度下各种换热模式的导热系数计算模型和方法进行了综述。其次，对纳米多孔二氧化硅气凝胶材料及其复合绝热材料的有效导热系数模型的研究进展进行了综述。然后以我们以前的工作为例，介绍了气凝胶隔热材料从纳米尺度到宏观尺度的有效导热系数模型的建立过程。最后需要指出的是，对于纳米多孔二氧化硅气凝胶隔热材料来说，要深入了解材料内部的纳米尺度换热机理，还需要深入研究一些关键问题，如气固界面的耦合换热行为、尺度效应/界面效应对纳米固体颗粒导热系数的影响等，因此有必要继续深入研究这些问题，为建立更准确的传热模型以及优化材料的隔热性能提供帮助。(C)2015爱思唯尔有限公司。保留所有权利。
This paper summarized the development of the effective thermal conductivity models for the nanoporous silica aerogel insulation material. Firstly, the nanoscale heat transfer characteristics inside aerogel material was introduced. Secondly, the existing models and methods to calculate the thermal conductivity of each heat transfer mode at the nanoscale were reviewed. Next, the advances and developments of the effective thermal conductivity models for the nanoporous silica aerogel materials as well as its composite insulation material were also discussed. Then the procedure of establishing the effective thermal conductivity model of the aerogel insulation material from nanoscale to macroscale was introduced by taking our previous work as an illustration. Finally, it should be noted that for the nanoporous silica aerogel insulation material, there are still some key issues that need to be investigated to get deep understanding of the mechanism of nanoscale heat transfer inside the material, such as the coupled heat transfer behavior at the gas-solid contact interface, the influence of scale effect/interfacial effect on the thermal conductivity of nanoscale solid particles, etc. Thus it is necessary to keep on investigating these questions thoroughly to provide help for establishing more accurate heat transfer model as well as optimizing the insulation performance of the material. (C) 2015 Elsevier Ltd. All rights reserved.