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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
142 Heat Transfer: Thermal Management of Electronics
Therefore, n effectiveness can be dened as the ratio of the n base thermal resis-
tance to the n thermal resistance:
ε
f
b
f
R
R
=
. (7.38)
Using Equations 7.33 through 7.35 for R
f
, and considering that for a n with
constant cross section A
b
= A
c
and therefore R
b
= 1/hA
c
, the following expressions are
obtained for n effectiveness.
Innitely long n•
ε
f
c
kP
hA
=
(7.39)
Fin with adiabatic tip•
ε
f
c
kP
hA
aL= tanh
(7.40)
Fin with convection and radiation from its tip•
εε
f
c
kP
hA
aL
h
ak
aL
aL
h
ak
aL
=
+
+
sinh cosh
cosh sinh
or
ff
c
c
kP
hA
aL= tanh
(7.41)
Several conclusions can be drawn from Equation 7.39 ...
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Publisher Resources

ISBN: 9781439814680