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9/22/2010
1
External Flow:
The Flat Plate in Parallel Flow
Chapter 7
Section 7.3
• Subject to prescribed boundary conditions, numerical solutions to the momentum
and energy equations yield the following results for important
local boundary layer
parameters
:
()
1/2

with /
0.99 at
5.
5.0
5
/R
0
e
,
∞
∞
=
=
==
x
x
u
u
vx
u
η
δ
22
and
/
0.332,
d
f
d
=
,
,
2
0.664Re
/2
x
sx
fx
C
u
τ
ρ
−
∞
≡=
1/3
0 332 R
P
x
hx
N
and
0
=
(
)
(
)
**
00
 with
/
/
/
/
xss
y
hqTT k
Ty
k
uv
xd
Td
∞∞
′
=−
=
∂
∂
=
*1
/
3
0
and
/
0.332 Pr
for Pr
0.6,
dT
d
=
=>
0.332 Re
Pr
xx
Nu
k
=
=
r
P
t
=
How were these determined? Blasius solution.
Consider steady parallel flow of atmospheric air over a flat
plate. The air has a temperature of 300 K and a freestream
velocity of 25 m/s. Evaluate the following:
a)Boundary layer thickness at distances of
x
= 1, 10, and
100 mm from the leading edge.
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View Full Document9/22/2010
2
Consider steady parallel flow of atmospheric air over a flat plate. The air
has a temperature of 300 K and a freestream velocity of 25 m/s.
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 Fall '10
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