-
The shape factors with themselves of two infinitely long black body concentric cylinders with a dia ratio of 3 are _____ for the Inner and _____ for the outer
-
-
F21 = 3 2 -
F22 = 2 3 -
F21 = 2 3 -
F22 = 3 2
-
Correct Option: B
= 3 | |
d1 |

For Body – 1
F11 + F12 = 1
F12 = 1 (∵ F11 = 0)
F21 + F22 = 1 - (A) |
By applying reciprocity theorem,
A1 F12 = A2 F21
A1 = A2 F21
or F21 = | = | = | = | ||||
A2 | πd2l | d2 | 3 |
F21 = | ||
3 |
Substituting, F21 = | in(A),weget | |
3 |
F22 = 1 | |
3 |
F22 = | |
3 |