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What is the approximate mean velocity gradient, G, in a 10 m long rough pipe under...

What is the approximate mean velocity gradient, G, in a 10 m long rough pipe under the following flow conditions: Q=10 m3/sec, Dia=1.0 m, T=20C.
The friction factor is a function of Re.
For Re > 104, f=0.06
For Re < 103, f=64/Re

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