Thermodynamics HW Solutions 912

Thermodynamics HW Solutions 912 - Chapter 12 Radiation Heat...

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Chapter 12 Radiation Heat Transfer 12-17 The view factor between the two infinitely long parallel cylinders located a distance s apart from each other is to be determined. Assumptions The surfaces are diffuse emitters and reflectors. Analysis Using the crossed-strings method, the view factor between two cylinders facing each other for s/D > 3 is determined to be D D (2) (1) s F sD s D 12 22 2 = × = +− ∑∑ Crossed strings Uncrossed strings String on surface 1 (/ ) π or D s D s F + = 2 2 2 1 2 12-18 Three infinitely long cylinders are located parallel to each other. The view factor between the cylinder in the middle and the surroundings is to be determined.
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