Question: Equation 3.19 defines the mean velocity for laminar flow using the Hagen-Poiseuille law. Equation 3.20 gives the Darcy-Weisbach equation applied to a horizontal uniform pipe.

Equation 3.19 defines the mean velocity for laminar flow using the Hagen-Poiseuille law. Equation 3.20 gives the Darcy-Weisbach equation applied to a horizontal uniform pipe. Derive Equation 3.20a. showing all steps in the process.
Equation 3.19

Equation 3.20

Equation 3.20a

128 (P - P)D 32 D/2g 64 -

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