The friction factor is traditionally computed through Colebrook's equation or by using Moody's chart. However, these approaches have shown their limitations in getting accurate values for such factor. Different models to calculate the friction factor have been proposed, achieving different levels of certainty. In this paper, we revisit the distinct strategies used to estimate the friction factor and propose the use of a modified version of a model proposed by these authors. This model is based on the phenomenology of the flow as it transitions from laminar to turbulent flow conditions. Keywords Friction factor • Colebrook equation • Moody chart • Lambert W function • Artificial intelligence List of symbols ε Average projection of roughness, m ν Kinematic viscosity, m 2 /s ε/D Relative roughness f Friction factor Re Reynolds number and similar abbreviations do not use italics D Pipe diameter, m U Flow maximum velocity, m/s ū Flow mean velocity, m/s V* Shear force-velocity or friction velocity, m/s
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