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Unformatted text preview: 1 Radiation T T r 4 T 4 T r T r 4 T 4 Two parallel infinite planes that are ideal blackbodies . i.e., they are perfect absorbers and radiators. No edge effects for infinite planes Every body radiates heat in proportion to the fourth power of its absolute temperature in Kelvins. The plane at temperature T receives a net heat flux of ) ( 4 4 T T f r = 2 NonBlackbody Radiation A body that is not a blackbody emits less heat. Emissivity, : =(emissive power) / (emissive power of a blackbody) <1 for polished aluminum=0.1 for black paint on metal=0.9 For infinite parallel planes: ( ) ( ) ) ( 1 1 1 4 4 T T f r r + = 3 Shape Factor For nonparallel, nonflat, finite surfaces: Radia tion heat transfer is more complicated. Depends on the distance, surface area, the angle between surface normals and emissivities....
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This note was uploaded on 06/06/2011 for the course EAS 4240 taught by Professor Peterifju during the Spring '08 term at University of Florida.
 Spring '08
 PETERIFJU

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