Civil Engineering MCQAE Level Civil Engineering
Using Darcy-Weisbach, f=0.025, L=150 m, D=0.25 m and V=2 m/s. Friction head loss is nearly
Fluid MechanicsOriginal practiceMEDIUM
Choose the correct answer
A
3.06 m
B
6.12 m
C
1.53 m
D
4.59 m
Correct Answer
A. 3.06 m
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Darcy-Weisbach equation: hf = f × (L/D) × (V²/2g). Here f = 0.025 (friction factor), L = 150 m (pipe length), D = 0.25 m (diameter), V = 2 m/s (velocity), g = 9.81 m/s². hf = 0.025 × (150/0.25) × (2² / (2 × 9.81)) = 3.06 m m. Head loss due to friction increases with pipe length and velocity squared, and decreases with larger diameter.
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