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Flow of non‐Newtonian fluids in pipes with large roughness
Author(s) -
Graham Lachlan J. W.,
Pullum Lionel,
Wu Jie
Publication year - 2016
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.22494
Subject(s) - laminar flow , mechanics , newtonian fluid , non newtonian fluid , turbulence , surface finish , flow (mathematics) , materials science , pipe flow , flow conditioning , work (physics) , surface roughness , geology , reynolds number , composite material , thermodynamics , physics
Pipes with large roughnesses can occur due to erosion, corrosion, and scale. These roughnesses can be much larger than are accounted for in the Moody diagram. Experimental tests have shown that laminar flow of non‐Newtonian fluids in pipes with large roughnesses can be accurately predicted by using a constricted diameter, where the diameter measurement is taken as the typical minimum of the rough pipe. Turbulent flows of non‐Newtonian fluids are less accurately predicted by available methods and it is suggested that test work be performed if it is required to account for large pipe roughness.