For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter) ?
Correct answer: C. 1/D5
- A. 1/D
- B. 1/D2
- C. 1/D5
- D. D2
Explanation
At constant flow rate, velocity varies as 1/D², while frictional head loss contains the factor V²D⁻¹. Therefore, with the friction factor treated as constant, head loss varies approximately as 1/D⁵.
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