Thermodynamics HW Solutions 908

Thermodynamics HW Solutions 908 - Chapter 12 Radiation Heat...

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Chapter 12 Radiation Heat Transfer 12-10 A semispherical furnace is considered. The view factor from the dome of this furnace to its flat base is to be determined. Assumptions The surfaces are diffuse emitters and reflectors. (1) (2) D Analysis We number the surfaces as follows: (1): circular base surface (2): dome surface Surface (1) is flat, and thus F 11 0 = . 1 1 : rule Summation 12 12 11 = = + F F F 0.5 = = = = = ⎯→ = 2 1 2 4 ) 1 ( A : rule y reciprocit 2 2 2 1 12 2 1 21 21 2 12 1 D D A A F A A F F A F π 12-11 Two view factors associated with three very long ducts with different geometries are to be determined. Assumptions 1 The surfaces are diffuse emitters and reflectors. 2 End effects are neglected. Analysis ( a ) Surface (1) is flat, and thus F 11 0 = . 1 = = + 12 12 11 1 : rule summation F F F 0.64 = = = = = 2 ) 1 ( 2 A : rule
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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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