Question:-
Heat transfer by radiation between two grey bodies of emissivity e is proportional to (notations have their usual meanings)
Option (A)
(Eb-J) /(1- e)
Option (B)
(Eb-J) /{(1- e)/e}
Option(C)
(Eb -J) /(1- e)2
Option(D)
(Eb-J) /(1- e2)
Correct Option:
(B)
Question Solution:
a = Î kirchoff’s law
q = Ai (Ei - aiGi)
r = 1 -a = 1-Î1
Radiosity J = Ei Ebi + (1-Îi)Gi
qi = Ai {Ji-(Ji-ÎEbi)/(1-Î)}
qi = {(Ebi-Ji) / ((1-Î1)/ÎAi)}
question-answer-faq-6077