Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f1 and that for smooth pipe is f2. Pick out the correct statement ?
Correct answer: C. f1 > f2
- A. f1 = f2
- B. f1 < f2
- C. f1 > f2
- D. Data not sufficient to relate f1 & f2
Explanation
At the same diameter, velocity, fluid, and length, both pipes have the same Reynolds number, but the rough pipe has greater relative roughness. Its friction factor is therefore higher than that of the smooth pipe.
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