ν = μ / ρ = kinematic viscosity (m 2 /s, ft 2 /s)
Equation (1) is only valid at laminar conditions where Reynolds Number is less than 2300 . For turbulent conditions where Reynolds Number exceeds 4000 the Colebrook equation should be used to calculate the friction coefficient.
In practice laminar flow is only actual for viscous fluids - like crude oil, fuel oil and other oils.
The friction coefficient for laminar flow indicated in the Moody diagram (SI based):
The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
Friction loss coefficients in pipes, tubes and ducts.
The Darcy-Weisbach equation can be used to calculate the major pressure and head loss due to friction in ducts, pipes or tubes.
Introduction and definition of the dimensionless Reynolds Number - online calculators.
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