Analytical considerations of thermal radiation in cellular metal foams with open cells
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 0017-9310Full text not available from this repository.
Official URL: http://dx.doi.org/10.1016/j.ijheatmasstransfer.200...
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|
|Number of Pages:||12|
|Page Range:||pp. 929-940|
|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)|
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