Effective thermal conductivity of highly porous two-phase systems

被引：58

作者：

Jagjiwanram

Singh, R ^{[1
]}

机构：

[1] Univ Rajasthan, Dept Phys, Thermal Phys Lab, Jaipur 302004, Rajasthan, India

[2] Abdus Salaam Int Ctr Theoret Phys, Trieste, Italy

来源：

APPLIED THERMAL ENGINEERING | 2004年 / 24卷 / 17-18期

关键词：

effective thermal conductivity; series and parallel resistors; continuous medium; angle of inclination;

D O I：

10.1016/j.applthermaleng.2004.03.010

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A theoretical expression for predicting effective thermal conductivity (ETC) of highly porous two-phase systems has been developed. The porous system has been assumed to contain particles of irregular shape, being dispersed randomly within the continuous medium. The concept of averaging the temperature field within different phases has been used. Resistor model has been applied to determine ETC of two-phase porous systems, as a porous medium is neither composed of slabs parallel nor perpendicular to the heat flux. It is proposed to use slabs inclined at an angle theta with the heat flux lines. An effort is made to correlate angle of inclination theta in terms of the ratio of thermal conductivity of the constituent phases and the physical porosity. Best-fitted expression so obtained for theta is used in the derived model and found that the predicted values of ETC are quite close to the experimental results. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：2727 / 2735

页数：9

共 22 条

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