For the circular tube of equal length and diameter shown

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For the circular tube of equal length and diameter shown in figure below, the view factor F₁₃ is 0.17. The view factor F₁₂ in this case will be

1. 0.17
2. 0.21
3. 0.79
4. 0.83

Correct Option: D

1	= 2
r₁

and	r₃	= 0.5
	l

F₁₃ = 0.17,
F₁₁ = 0,
F₁₁ + F₁₂ + F₁₃ = 1
∴ F₁₂ = 1 – F₁₃
= 1 – 0 – 17 = 0.83