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
A. 0
B. $$\frac{{{{\text{R}}_2}}}{{{{\text{R}}_1} + {{\text{R}}_2}}}$$
C. 1
D. $${\left( {\frac{{{{\text{R}}_1}}}{{{{\text{R}}_2}}}} \right)^2}$$
Answer: Option B
This Question Belongs to Chemical Engineering >> Heat Transfer
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Related Questions on Heat Transfer
A. 3.06 × 105
B. 6.12 × 105
C. 7.24 × 105
D. 9.08 × 105
Fqra cold viscous feed, backward feed gives __________ than forward feed.
A. A higher capacity
B. A lower capacity
C. Lower economy
D. None of these
A. Twice
B. Four times
C. Square root of
D. Square of
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