The default values used are for turbulent air flow in a 315 mm duct with 6 m/s (0.47 m3/s). The kinematic viscosity used to calculate the Reynolds Number is 15 10-6 m2/s.

The calculator below can be used to calculate the friction coefficient if velocity and kinematic viscosity of the fluid are known.

The friction coefficients used to calculate pressure loss (or major loss) in ducts, tubes and pipes can be calculated with the Colebrook equation

1 / λ^{1/2} = -2 log [ 2.51 / (Re λ^{1/2}) + (k / d_{h}) / 3.72 ] (1)

where

λ = Darcy-Weisbach friction coefficient

Re = Reynolds Number

k = roughness of duct, pipe or tube surface (m, ft)

d_{h} = hydraulic diameter (m, ft)

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