The Darcy-Weisbach friction factor ‘f’ for laminar flow in a smooth circular pipe depends only on Reynolds number (Re) and is given by:
A16 / Re
B32 / Re
C64 / Re
D0.316 / (Re)^0.25
Explanation
For laminar flow in circular pipes (Re < 2000), friction factor f is determined analytically as f = 64 / Re. Head loss due to friction is hf = (f * L * v^2) / (2 * g * D).

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