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Heat & Mass Transfer - acharya ng ranga agricultural university
Heat & Mass Transfer - acharya ng ranga agricultural university
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where<br />
q<br />
f<br />
η<br />
f<br />
= =<br />
qmax<br />
qt<br />
hA θ<br />
t<br />
b<br />
q<br />
t is the total heat rate from the surface area A t associated with both<br />
the fins and the exposed portion of the base (often termed the prime surface).<br />
If there are N fins in the array, each of surface area A f , and the area of the<br />
prime surface is designated as A b , the total surface area is<br />
A = NA + A<br />
t<br />
f<br />
b<br />
The maximum possible heat rate would result if the entire fin surface,<br />
as well as the exposed base, were maintained at<br />
T<br />
b .<br />
Figure 8.3 Representative fin arrays. (a) Rectangular fins. (b) Annular fins.
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