Colebrook-White

Colebrook-White's formula can be used to determine the friction coefficient (l) of a turbulent flow. The formula is normally used to create diagrams where the friction coefficient can be read.

The empirical formula can be used to determine the friction coefficient (l) of a turbulent flow: (Colebrook-White’s formula)

k = the roughness factor of the pipe [m]
d = the interior diameter of the pipe [m]

The roughness factor of the pipe characterises the interior surface of the pipe. It is not directly dependent on the size of the pipe, but on the nature and material of the pipe.

The formula is normally used to create diagrams where the friction coefficient can be read. This type of diagram is known as a Moody’s diagram. Diagrams covering pressure loss in different types of pipes can be created from a Moody’s diagram.





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