Question: Friction factor for a hydraulically smooth pipe at N R e = 2 1 0 0 is f 1 . If the pipe is further

Friction factor for a hydraulically smooth pipe at NRe=2100 is f1. If the pipe is further smoothened (i.e, roughness is reduced), the friction factor at the same value of NRe, will
A. increase.
B. decrease
C. remain unchanged.
D. increase or decrease depending on the pipe material.
Friction factor for a hydraulically smooth pipe at NRe=2100 is f1.

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