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Problem 4.100
[Difficulty: 2]
Given:
Data on wake behind object
Find:
An expression for the drag
Solution:
Basic equation:
Momentum
Applying this to the horizontal motion
F
−
U
ρ
−
π
⋅
1
2
⋅
U
⋅
()
⋅
0
1
r
ur
ρ
⋅
2
⋅
π
⋅
r
⋅
⋅
⌠
⎮
⌡
d
+
=
F
πρ
U
2
2
0
1
r
rur
2
⋅
⌠
⎮
⌡
d
⋅
−
⎛
⎜
⎝
⎞
⎠
⋅
=
F
U
2
⋅
12
0
1
r
r 1
cos
π
r
⋅
2
⎛
⎝
⎞
⎠
2
−
⎛
⎜
⎝
⎞
⎠
2
⋅
⌠
⎮
⎮
⎮
⌡
d
⋅
−
⎡
⎢
⎢
⎢
⎣
⎤
⎥
⎥
⎥
⎦
⋅
=
F
U
2
⋅
0
1
r
r2
r
⋅
cos
π
r
⋅
2
⎛
⎝
⎞
⎠
2
⋅
−
r cos
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This note was uploaded on 10/19/2011 for the course EGN 3353C taught by Professor Lear during the Fall '07 term at University of Florida.
 Fall '07
 Lear
 Fluid Mechanics

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