Pressure loss Moody    

Moddy Diagram



Δ p = f · l/d · ρ/2 · v2       (Darcy-Weisbach formula)

dimensioned variables (metric as example)
Δ p[kg/(m s²) = 10-5 bar = 10-2mbar]   : Pressure loss of the straight pipe
l[m] : Length
d[m] : Internal Diameter
ρ[kg/m³]: Density
v[m/s]: Average speed in the pipe
η[kg/(m s) = Pas]: Dyn. Viscosity
ε [m]: Roughness
dimensionless values
Re[-]: Reynolds number Re = ρ v d / η
f[-] : Darcy Friction Factor





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