How calulates the software pipes with non-circular diameter (hydraulic diameter)?
You can calculate pressure drops in pipes with non-circular diameter with the normal formula if you use instead the diameter the hydraulic diameter: Hydraulic diameter = 4 * cross section area / circumference Velocity = volume flow / cross section area Reynolds number = velocity * hydraulic diameter * density / dyn. viscosity Pipe friction number Lamda at turbulent flow: Pressure drop = Lamda * pipe length / hydr. diameter * density / 2 * velocity² As example a calculation of a rectangular pipe: Known: Width = 100 mm; Height = 50 mm; Length = 1 m Pipe roughness k = 0.1 mm Volume flow = 100 m³/h Density = 998.2 kg/m³; Dyn.
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