(Turbulent) Pipe-Flow Calculations



Parameter Symbol Value
Length (m) L
Kinematic viscosity (m2 s-1) ν
Nikuradse roughness (m) ks
Minor loss coefficient K
Calculate or specify friction factor?
Darcy friction factor λ
Diameter (m) D
Head loss (m) h
Quantity of flow (m3 s-1) Q

Set any two of D, h, Q and calculate the third.

(Note that many engineers use f for friction factor, with λ being equivalent to either f or 4f. The value here is 4 times the skin-friction coefficient.)