Turbulent flows and is known as darcy weisbach

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turbulent flows and is known as Darcy - Weisbach formula. It is found that friction factor depends on density of the fluid, ρ velocity of the flow, v diameter of the pipe, d viscosity of the fluid, µ wall roughness, ε ε wall roughness i.e. f = f( ρ , v, d, µ , ε ) By dimensional analysis, f = f ρ µ ε vd d , = f ( Reynolds number, relative roughness) where Reynolds number = µ ρ vd and relative roughness = ε d (7.15)
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