Problem 4: The main cross-cable between towers of a coastal suspension bridge is 60 cm in diameter and 90 m long. Estimate the total drag force on this cable in crosswind of 50 miles/hour. Is the flow laminar or turbulent? Hint: Use Fig. 11-31 on page 595 of our textbook to find the drag coefficient. CD 400 200 100 60 40 8 20 10 6 4 2 1 0.6 0.4 0.2 0.1 0.06 10-1 CD= 24 Re 100 101 102 Re Smooth cylinder. 103 Smooth sphere 11.8 THE DRAG COEFFICIENT 104 Drag coefficients for a sphere and long cylinder Fig. 11-31 105 Rough cylinder 106

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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Problem 4:
The main cross-cable between towers of a coastal suspension bridge is 60 cm in diameter and
90 m long. Estimate the total drag force on this cable in crosswind of 50 miles/hour. Is the flow
laminar or turbulent? Hint: Use Fig. 11-31 on page 595 of our textbook to find the drag
coefficient.
Co
400
200
100
60
40
20
10
6
4
2
1
0.6
0.4
0.2
0.1
0.06
10-1
-CD = 2²
10⁰
101
102
Re
Smooth
cylinder.
103
Smooth
sphere
11.8 THE DRAG COEFFICIENT
104
Drag coefficients for a sphere and long cylinder
Fig. 11-31
105
Rough
cylinder
106
Transcribed Image Text:Problem 4: The main cross-cable between towers of a coastal suspension bridge is 60 cm in diameter and 90 m long. Estimate the total drag force on this cable in crosswind of 50 miles/hour. Is the flow laminar or turbulent? Hint: Use Fig. 11-31 on page 595 of our textbook to find the drag coefficient. Co 400 200 100 60 40 20 10 6 4 2 1 0.6 0.4 0.2 0.1 0.06 10-1 -CD = 2² 10⁰ 101 102 Re Smooth cylinder. 103 Smooth sphere 11.8 THE DRAG COEFFICIENT 104 Drag coefficients for a sphere and long cylinder Fig. 11-31 105 Rough cylinder 106
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