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___________________?
Correct answer: B. Friction co-efficient for flows at equal Reynold number
- A. Relative roughness
- B. Friction co-efficient for flows at equal Reynold number
- C. Absolute roughness
- D. All A., B. & C.
Explanation
Hydraulic roughness is compared by the friction coefficient obtained at the same Reynolds number, since this captures the pipe's resistance to flow. Absolute roughness alone is insufficient, while relative roughness is especially relevant for turbulent-flow correlations.
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