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Fluid Mechanics
Drag Force on Plate due to Boundary layer
A smooth flat...
Question
A smooth flat plate is in a parallel flow stream. The ratio of the drag over the upstream half of the plate to that over the entire plate is ... Assume the average skin friction coefficient is proportional to
(
R
e
x
)
−
1
/
2
.
0.707
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Solution
The correct option is
A
0.707
Reynolds number,
R
e
=
ρ
V
x
μ
g
i
v
e
n
C
f
x
∝
1
√
x
⇒
F
D
1
F
D
2
=
√
x
2
√
x
1
=
√
l
/
2
√
l
=
1
√
2
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