Zhao, Chang-Ying, Tassou, S. A and Lu, T. J. (Tianjian). (2008) Analytical considerations of thermal radiation in cellular metal foams with open cells. International Journal of Heat and Mass Transfer, Vol.51 (No.3-4). pp. 929-940. ISSN 0017-9310

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Abstract

An analytical model is developed to characterize the radiative transport process in highly porous, open-celled metal foams having idealized cellular morphologies in terms of fundamental radiative parameters such as emissivity, reflectivity and configuration factors. In comparison with the conventional two-flux approach or the diffusion approximation utilizing the Rosseland mean coefficient, the present model is explicit and yet relatively simple. Overall, the predicted effective radiative conductivity as a function of pore size and relative density (defined as the ratio of foam density to solid density) agrees well with that measured using a guarded-hot-plate apparatus for steel alloy foams. A systematic parametric study is subsequently carried out. The contribution of reflectance to thermal radiation is found to be significant, up to 50%, but the effect of temperature gradient is relatively small. The equivalent radiative conductivity increases linearly with increasing cell size for a fixed relative density, whilst for a given cell size the variation of relative density only has a small effect on radiation due to the mixed effects of increased emission and extinction. (C) 2007 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH):	Metal foams, Electromagnetic waves, Thermal conductivity, Reflectance
Journal or Publication Title:	International Journal of Heat and Mass Transfer
Publisher:	Pergamon
ISSN:	0017-9310
Date:	February 2008
Volume:	Vol.51
Number:	No.3-4
Number of Pages:	12
Page Range:	pp. 929-940
Identification Number:	10.1016/j.ijheatmasstransfer.2007.10.010
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), National Basic Research Programme of China (NBRPC), China. Jiao yu bu (New Century Excellent Talents in University) (NCET)
Grant number:	GR/T24364/01 (EPSRC), 50576069 (NSFC), 2006CB601203 (NBRPC), NCET-04-0944 (NCET)
URI:	http://wrap.warwick.ac.uk/id/eprint/30470

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