Engineering Board Exam Reviewer · Fluid Mechanics · medium

In turbulent flow through rough pipes at very high Reynolds numbers (fully rough zone), the friction factor depends mainly on:

1. Relative roughness only
2. Reynolds number only
3. Both Reynolds number and fluid density
4. Pipe length

Answer

A. Relative roughness only

Solution

In the fully rough region of the Moody chart, the curves become horizontal.

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