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Which outcome occurs when substantial roughness exists inside plumbing?

A)Increased frictional pressure drop occurs
B)Laminar flow becomes more stable
C)Kinetic energy increases significantly
D)Viscosity effects become negligible

💡 Explanation

Increased interior roughness causes greater momentum transfer between the fluid and pipe wall because the **momentum diffusivity** increases. Therefore, frictional head loss increases rather than decreasing overall kinetic energy, because the energy dissipates more quickly.

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