Thermodynamics HW Solutions 880

Thermodynamics HW Solutions 880 - Chapter 11 Fundamentals...

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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. Analysis The average emissivity of the surface can be determined from ) 1 ( + ) ( + + + ) ( ) ( ) ( ) ( 2 1 2 1 2 2 1 1 2 2 1 1 3 2 1 - 3 - 2 - 0 1 4 3 4 2 4 0 1 λ λλ ε εε σ f f f f f f f T d T E T d T E T d T E T b b b = = + + = where are blackbody radiation functions corresponding to , determined from ff λ 1 and λ 2 2 T 1 T and ε λ λ , μ m 2 6 0.7 0.4 0.3 λμ μ μ λ λ 1 2 2 0 066728 6 0 737818 T T =⎯ ⎯= (. 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.

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