Coupling model for heat transfer between solid and gas phases in aerogel and experimental investigation
Coupling model for heat transfer between solid and gas phases in aerogel and experimental investigation
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DOI：
10.1016/j.ijheatmasstransfer.2014.07.098
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发表时间：
2014-12-01
影响因子：
5.2
通讯作者：
Li, J. N.
中科院分区：
文献类型：
--
作者：
Bi, C.;Tang, G. H.;Li, J. N.
气凝胶固相和气相之间的耦合热传导对气凝胶的总有效导热系数有重要贡献。在假设气凝胶骨架中存在球形颗粒的基础上，建立了气凝胶平均孔径、平均粒径、气态导热系数和固体颗粒导热系数的耦合导热系数理论模型。对硅胶气凝胶的导热系数进行了实验研究，验证了耦合模型的正确性，实测数据与耦合模型吻合较好。通过实验结果、数值结果和理论预测，验证了本文的耦合模型。通过对几种耦合模型的比较，表明该模型具有较高的精度，没有复杂和困难的计算。(C) 2014 Elsevier Ltd.版权所有。
The coupling heat conduction between the aerogel solid and gas phases is of important contribution to the total effective thermal conductivity of aerogel. Based on the assumption of spherical particles in the aerogel backbone, a theoretical model is proposed to calculate the coupling thermal conductivity in aerogel which relates aeroger mean pore size, mean particle size, gaseous thermal conductivity and solid particle thermal conductivity. An experimental study on the thermal conductivity of silica aerogel is carried out to validate the coupling model, and good agreement between the measured data and the coupling model is found. The present coupling model is also verified by available data including experimental results, numerical results and theoretical predictions in the literature. The comparison among the coupling models shows that the present model is of high accuracy without complex and difficult calculations. (C) 2014 Elsevier Ltd. All rights reserved.