Consider the long concentric cylinders with diameters D1 and D2 and surface areas A1 and A2 . Express the view factors F22 in terms of the cylinder diameters
1
\(F_{22}=\frac{D_2}{D_1}\)
2
\(F_{22}=1-\frac{D_2}{D_1}\)
3
\(F_{22}=1-\frac{D_1}{D_2}\)
4
None of the above