Question: In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of
Options
A : relative roughness.
B : absolute roughness.
C : friction co-efficient for flows at equal Reynold number.
D : all (a), (b) & (c).
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