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date: 23 July 2019

absolute roughness (Symbol ε) 

Source:
A Dictionary of Chemical Engineering
Author(s):

Carl Schaschke

The roughness of a solid surface expressed as the average height of undulations and imperfections. It is measured using an instrument that draws a stylus over the surface. The roughness of the inner surface of a pipe wall used to transport fluids with turbulent flow has the effect of increasing frictional pressure drop. Expressed ... ...

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