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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
214 Heat Transfer: Thermal Management of Electronics
action of viscous force reduces the uid velocity in layers near the wall and these
slower moving layers slow down uid layers above them. That is why, as shown
in Figure 9.5, the thickness of velocity boundary layer increases as ow moves
downstream the plate.
Equation 9.1 can be used to calculate viscous sheer stress if the variation of veloc-
ity U with distance from the surface, y, is known. A more practical approach that is
used in most engineering calculations is to dene a local friction coefcient, C
f
, that
relates viscous sheer stress to easily measurable quantities:
C
U
f
s
τ
ρ
1
2
2
.
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Publisher Resources

ISBN: 9781439814680