The flow velocities at different sections of the pipe diameter vary; which one should be used as the reference? !
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The flow velocity is highest at the center of the pipe. It is slowest at the pipe wall. Which one should be taken as the standard? Should we use the average flow velocity?
I think using the geometric mean is more accurate than the arithmetic mean; for estimation, the arithmetic mean is sufficient
Do your instruments read the speed directly?
I think this average flow velocity is either the calculated flow velocity or the directly measured flow velocity. Whether it’s the actual central flow velocity or the flow velocity near the wall, do we know it? And perhaps it’s not even necessary to know!
Measure the wind speed using an anemometer. It is indeed very low near the tube wall.
Volumetric flow rate of the fluid divided by the cross-sectional area of the pipe.