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turbulent flows and is known as Darcy - Weisbachformula. 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, εεwall roughnessi.e. f = f(ρ, v, d, µ, ε) By dimensional analysis, f = fρµεvdd,⎛⎝⎜⎞⎠⎟= f ( Reynolds number, relative roughness) where Reynolds number = µρvdand relative roughness = εd(7.15)
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