Thermodynamics HW Solutions 904

Thermodynamics HW Solutions 904 - Chapter 12 Radiation Heat...

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Chapter 12 Radiation Heat Transfer Chapter 12 RADIATION HEAT TRANSFER View Factors 12-1C The view factor represents the fraction of the radiation leaving surface i that strikes surface j directly. The view factor from a surface to itself is non-zero for concave surfaces. F ij 12-2C The pair of view factors and are related to each other by the reciprocity rule where A i is the area of the surface i and A j is the area of the surface j. Therefore, F F ji AF A F ii j j j i = F A A F 1 12 2 21 12 2 1 21 =⎯ ⎯= 12-3C The summation rule for an enclosure and is expressed as where N is the number of surfaces of the enclosure. It states that the sum of the view factors from surface i of an enclosure to all
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