CUED Publications database

The temperature dependence of effective thermal conductivity of open-celled steel alloy foams

Zhao, CY and Lu, TJ and Hodson, HP and Jackson, JD (2004) The temperature dependence of effective thermal conductivity of open-celled steel alloy foams. Materials Science and Engineering A, 367. pp. 123-131. ISSN 0921-5093

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Abstract

The effective thermal conductivity of steel alloy FeCrAlY (Fe-20 wt.% Cr-5 wt.% Al-2 wt.% Y-20 wt.%) foams with a range of pore sizes and porosities was measured between 300 and 800 K, under both vacuum and atmospheric conditions. The results show that the effective thermal conductivity increases rapidly as temperature is increased, particularly in the higher temperature range (500-800 K) where the transport of heat is dominated by thermal radiation. The effective conductivity at temperature 800 K can be three times higher than that at room temperature (300 K). Results obtained under vacuum conditions reveal that the effective conductivity increases with increasing pore size or decreasing porosity. The contribution of natural convection to heat conduction was found to be significant, with the effective thermal conductivity at ambient pressure twice the value of vacuum condition. The results also show that natural convection in metal foams is strongly dependent upon porosity. © 2003 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Cellular metal foams Natural convection Thermal conductivity Thermal radiation
Subjects: UNSPECIFIED
Divisions: Div A > Turbomachinery
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:28
Last Modified: 20 Dec 2014 19:03
DOI: 10.1016/j.msea.2003.10.241