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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
152 Heat Transfer: Thermal Management of Electronics
R
NhAANA hNAA
hs cr
ff fhsb fb fffhsb
,
()[(
=
+−
=
+
11
ηη−− NA h
fb
)]
.
(7.63)
The total n area for this heat sink is N
f
A
f
and the total heat sink heat transfer area
is A
t
= N
f
A
f
+ A
unnned
= N
f
A
f
+ A
hsb
N
f
A
b
. Substituting A
hsb
N
f
A
b
= A
t
N
f
A
f
in the
above equation gives
R
NhAANA hANA
hs cr
ff ftff tfff
,
()[()]
=
+−
=
−−
11
1ηηhh
NA
A
Ah
ff
t
ft
=
−−
1
11()
.
η
(7.64)
The total heat transfer rate from heat sink is
Q
TT
R
NA
A
Ah T
hs
b
hs cr
ff
t
ftb
=
=−
,
()(11η− T
)
. (7.65)
Fin effectiveness was dened as the ratio of heat transfer rate from a n to the
heat transfer rate from the base of the n if there ...
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Publisher Resources

ISBN: 9781439814680