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Chemical Engineering - Chemical Engineering Basics - Discussion

Discussion Forum : Chemical Engineering Basics - Section 28 (Q.No. 8)
Chemical Engineering Basics
8.
For infinite parallel planes having emis-sivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by
(ε1 + ε2)/ε1.ε2
ε1.ε2/(ε1 + ε2 - ε1.ε2)
ε1.ε2
ε1 + ε2
Answer: Option
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