The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities $${\varepsilon _{\text{x}}}$$ & $${\varepsilon _{\text{y}}}$$ is given by
A. $${\varepsilon _{\text{x}}} + {\varepsilon _{\text{y}}}$$
B. $${\varepsilon _{\text{x}}} \cdot {\varepsilon _{\text{y}}}$$
C. $$\frac{1}{{{\varepsilon _{\text{x}}}}} + \frac{1}{{{\varepsilon _{\text{y}}}}}$$
D. $$\frac{{{\varepsilon _{\text{x}}} + {\varepsilon _{\text{y}}}}}{{{\varepsilon _{\text{x}}} + {\varepsilon _{\text{y}}} - {\varepsilon _{\text{x}}} \cdot {\varepsilon _{\text{y}}}}}$$
Answer: Option D
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
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