Thermodynamics HW Solutions 901

Thermodynamics HW Solutions 901 - Chapter 11 Fundamentals...

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Chapter 11 Fundamentals of Thermal Radiation 11-81 A hole is drilled in a spherical cavity. The maximum rate of radiation energy streaming through the hole is to be determined. Analysis The maximum rate of radiation energy streaming through the hole is the blackbody radiation, and it can be determined from W 0.144 = × π = σ = 4 4 2 8 2 4 K) 600 )( K . W/m 10 67 . 5 ( m) 0025 . 0 ( T A E The result would not change for a different diameter of the cavity. 11-82 The variation of absorptivity of a surface with wavelength is given. The average absorptivity of the surface is to be determined for two source temperatures. Analysis ( a ) T = 1000 K . The average absorptivity of the surface can be determined from ) 1 ( + ) ( + + + ) ( 2 1 2 1 2 2 1 1 3 2 1 - 3 - 2 - 0 1 λ λ λ λ λ λ λ λ α α α = α α α = α f f f f f f f T where are blackbody radiation functions corresponding to
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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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