For infinite parallel planes having emis-sivities _1 _2, the interchange factor for radiation from surface 1 to surface 2 is given by

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Chemical Engineering Basics

For infinite parallel planes having emis-sivities $${{\varepsilon _1}}$$ & $${{\varepsilon _2}}$$, the interchange factor for radiation from surface 1 to surface 2 is given by

A) $$\frac{{{\varepsilon _1} + {\varepsilon _2}}}{{{\varepsilon _1}.{\varepsilon _2}}}$$ B) $$\frac{{{\varepsilon _1}.{\varepsilon _2}}}{{{\varepsilon _1} + {\varepsilon _2} - {\varepsilon _1}.{\varepsilon _2}}}$$ C) $${\varepsilon _1}.{\varepsilon _2}$$ D) $${\varepsilon _1} + {\varepsilon _2}$$

Answer & Solution

Correct Answer: Option B

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For infinite parallel planes having emis-sivities varepsilon 1 & varepsilon 2...

For infinite parallel planes having emis-sivities $${{\varepsilon _1}}$$ & $${{\varepsilon _2}}$$, the interchange factor for radiation from surface 1 to surface 2 is given by

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