Roughness Coefficient

Written by Jerry Ratzlaff. Posted in Properties

Roughness coefficient (also known as relative roughness or absolute roughness) is the difference between absolute and relative roughness is that the relative roughness depends on the diameter of the pipe.  The relative roughness is defined by the absolute roughness divided by the inside diameter of the pipe.  

The roughness coefficient is used to calculate the friction factor using a Moody Diagram and the Reynolds number.