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Heat Transfer
book

Heat Transfer

by Younes Shabany
December 2009
Intermediate to advanced content levelIntermediate to advanced
523 pages
18h 30m
English
CRC Press
Content preview from Heat Transfer
Fins and Heat Sinks 147
Two common examples of ns with nonuniform cross sections are triangular and
circular ns shown in Figure 7.10. The solutions of Equation 7.51 can be used to
show that efciency of a triangular n is
η
f
aL
IaL
IaL
a
h
kt
==
12
2
2
1
0
()
()
,with
(7.52)
where t is the n thickness at the base, and the efciency of a circular n is
η
f
i
oc i
ioci
r
ar r
KarI ar IarK
=
(
)
2
22
11 11
()()()(aar
KarI ar IarK ar
a
oc
iocioc
)
()() ()()
01 01
+
=with
22h
kt
,
(7.53)
where t is the n thickness and r
oc
= r
o
+ t/2 is the correct outer radius of the n [1,2].
Here I
0
and K
0
are modied, zero-order Bessel functions of the rst and second
kinds, respectivel
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Publisher Resources

ISBN: 9781439814680