Chapter 11 Fundamentals of Thermal Radiation 11-41 The variation of emissivity of a surface at a specified temperature with wavelength is given. The average emissivity of the surface and its emissive power are to be determined. AnalysisThe average emissivity of the surface can be determined from )1(+)(+++)()()()(212122112211321-3-2-014342401λλλεεεσfffffffTdTETdTETdTETbbb−−==++=∞∞∫∫∫where are blackbody radiation functions corresponding to , determined from ffλ1and λ22T∞1Tand ελλ, μm2 6 0.70.40.3λμμμλλ1220 06672860 737818TT=⎯→⎯=→(.m)(1000 K) = 2000 mK
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.