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A sphere of radius 'R1' is enclosed in a sphere of...

This question belongs to Chemical Engineering Heat Transfer
Heat Transfer
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A sphere of radius 'R1' is enclosed in a sphere of radius 'R2'. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is

Answer & Solution
Correct Answer: Option B
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SAGAR HATWAR
SAGAR HATWAR 6 years ago
Correct answer is option D.
A1.F12=A2.F21 ....A1,A2 are area of first and second sphere respectively.
F21={A1/A2}*F12
Therefore,
F21={4πR1^2/4πR2^2}*F12

F21={R1/R2}^2*F12

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