The head loss in turbulent flow in a pipe varies_________________?
Correct answer: C. Approximately as the square of the velocity
- A. Directly as the velocity
- B. Inversely as the square of the velocity
- C. Approximately as the square of the velocity
- D. Inversely as the square of the diameter
Explanation
From the Darcy-Weisbach relation, head loss is proportional to f(v²/2g), and the friction factor changes only moderately with velocity in turbulent flow. Hence the practical dependence is approximately the square of velocity.
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