Application of hemisphere radiation shields with temperature-dependent emissivity for reducing heat transfer between two concentric hemispheres
M. Torabi1, A. Aziz2, S. Saedodin3
1 City University of Hong Kong
2 Gonzaga University
3 Semnan University
Torabi_mech@yahoo.com
Keywords: concentric hemispherical system, radiation shields, temperature-dependent surface emissivities, locations of shields, radiation network method
Pages: 481-488
Abstract
The radiation network method has been applied to calculate the net radiation heat transfer between two concentric hemispheres separated by two hemispherical radiation shields with temperature-dependent surface emissivities. Three different materials are chosen for radiation shields: aluminum oxide, silicon carbide, and tungsten. The reduction in heat transfer with shields depends not only on the surface characteristics of the two shields, but also on the locations of the shields. Three illustrative examples are presented to illustrate the effects of temperature dependent emissivities and shield locations on the percentage heat transfer reduction. The analysis can be used to study other cases as warranted.
|
