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Analytical considerations of thermal radiation in cellular metal foams with open cells
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Zhao, Changying, 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. doi:10.1016/j.ijheatmasstransfer.2007.10.010
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Official URL: http://dx.doi.org/10.1016/j.ijheatmasstransfer.200...
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 |
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| 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 | ||||
| Official Date: | February 2008 | ||||
| Dates: |
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| Volume: | Vol.51 | ||||
| Number: | No.3-4 | ||||
| Number of Pages: | 12 | ||||
| Page Range: | pp. 929-940 | ||||
| DOI: | 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) |
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