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4. The energy loss due to fluid flow through a pipe can be calculated using the following equations: DV p where: energy loss per mass of fluid flowing (J/kg) friction factor (dimensionless) NL L = pipe length (m) D pipe diameter (m) average fluid velocity (m/s) Q = volumetric flow rate (m3/s) A = pipe cross-sectional area (m2) Re = Reynolds number (dimensionless) = fluid density (kg/ms) fluid viscosity (kg/ms) 4.2 THE IF-ELSE STATEMEN Erercise 6: Decision making (continued) (continued) The friction factor, f, is calculated as: 64 Re when Re