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When a problem states “The velocity of the water flow in a pipe is 20 m/s”, which of the following velocities is it talking about?

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in Fluid Mechanics by (118k points)
When a problem states “The velocity of the water flow in a pipe is 20 m/s”, which of the following velocities is it talking about?

(a) RMS velocity

(b) Average velocity

(c) Absolute velocity

(d) Relative velocity

This question was addressed to me during an interview.

My question comes from Flow of Viscous Fluid Through Circular Pipes topic in portion Viscous Flow & Turbulent Flow of Fluid Mechanics

1 Answer

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Best answer
Right answer is (b) Average velocity

Easy explanation: In a pipe-flow, the velocity is always referred to the average velocity. There may be a case where all water particles move in the same direction with 20 m/s, then the average velocity will be equal to absolute velocity. But, this is only a special case. Hence, average velocity will always be true.

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