Coupling model for heat transfer between solid and gas phases in aerogel and experimental investigation

被引：93

作者：

Bi, C. ^{[1
]}

Tang, G. H. ^{[1
]}

Hu, Z. J. ^{[2
]}

Yang, H. L. ^{[2
]}

Li, J. N. ^{[2
]}

机构：

[1] Xi An Jiao Tong Univ, Sch Energy & Power Engn, MOE Key Lab Thermofluid Sci & Engn, Xian 710049, Peoples R China

[2] Aerosp Res Inst Mat & Proc Technol, Beijing 100076, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2014年 / 79卷

基金：

中国国家自然科学基金;

关键词：

Aerogel; Thermal conductivity; Coupling effect; Nanoporous material; Experiment; GASEOUS THERMAL-CONDUCTIVITY; SILICA AEROGEL; PORE-SIZE; PREDICTION; NANOSTRUCTURES; RESISTANCE; TRANSPORT;

D O I：

10.1016/j.ijheatmasstransfer.2014.07.098

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

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.

引用

页码：126 / 136

页数：11

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