Thermodynamics HW Solutions 876

Thermodynamics HW Solutions 876 - Chapter 11 Fundamentals...

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Chapter 11 Fundamentals of Thermal Radiation 11-33 Radiation is emitted from a small circular surface located at the center of a sphere. Radiation energy streaming through a hole located on top of the sphere and the side of sphere are to be determined. Assumptions 1 Surface A 1 emits diffusely as a blackbody. 2 Both A 1 and A 2 can be approximated as differential surfaces since both are very small compared to the square of the distance between them. Analysis ( a ) Approximating both A 1 and A 2 as differential surfaces, the solid angle subtended by A 2 when viewed from A 1 can be determined from Eq. 11- 12 to be sr 10 .963 1 m) 2 ( m) 005 . 0 ( 5 2 2 2 2 2 2 , 1 2 × = π = = ω r A r A n since A 2 were positioned normal to the direction of viewing. The radiation emitted by A 1 that strikes A 2 is equivalent to the radiation emitted by A 1 through the solid angle ω 2-1 . The intensity of the radiation emitted by A 1 is sr W/m 048 , 18 K) 1000 )( K W/m 10 67 . 5 ( ) ( 2 4 4 2
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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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