Absolute Roughness
INSTED/Database contains the average absolute roughness data for various commercial pipes. The absolute roughness, e, was determined empirically based on a comparison of the pressure drop versus volume flow rate for commercial pipes with that of experimental pipes of varying diameters with sand particles (of known diameters) attached to their surfaces. The size of the sand particles attached to the experimental pipe is denoted by e. A commercial pipe which shows similar pressure drop versus volume flow rate behavior as an experimental pipe of a given diameter and coated with sand particles of a given dimension, is said to have an absolute roughness given by the value of e.
The absolute roughness value is supplied in meters and can be converted to other units in all calling programs using INSTED's multi-directional, on-the-fly conversion listboxes
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