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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
426 Heat Transfer: Thermal Management of Electronics
16.1.3 so n i c li m i T
The maximum velocity of a compressible uid passing through a converging–
diverging nozzle is equal to the speed of sound in that uid, and happens at the throat
of the nozzle. The vapor ow in the evaporator of a heat pipe is similar to the ow
in a converging–diverging nozzle. The vapor velocity increases along the evaporator
and reaches a maximum, at the end of the evaporator section, that can not be higher
than the local speed of sound. This ow condition is called the sonic limit and the
associated heat transfer limit is given by [3]:
Q
ch A
s
fg v
=
+
ρ
γ
00
2( )
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Publisher Resources

ISBN: 9781439814680