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Axial mixing in pipes
Author(s) -
Tichacek L. J.,
Barkelew C. H.,
Baron Thomas
Publication year - 1957
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690030404
Subject(s) - laminar flow , mixing (physics) , turbulence , mechanics , reynolds number , flow (mathematics) , pipe flow , axial compressor , diffusion , eddy diffusion , materials science , thermodynamics , physics , quantum mechanics , gas compressor
The problem of axial mixing in straight pipes is analyzed by a modification of G. I. Taylor's analysis. The treatment presented here includes the effect of both Schmidt and Reynolds numbers throughout the turbulent‐flow range. All applicable data on flow of gases and liquids are found to confirm the validity of the method. The analysis indicates that axial mixing increases rapidly as the flow approaches the laminar region, especially for liquids, and that pipe roughness causes a relatively small increase in axial mixing. Turbulent eddy diffusion in the axial direction has a negligible effect. The results of the analysis are applicable to those systems wherein the kinematic viscosity of the flowing mixture does not vary greatly from one region to another and in which the concentration region of interest is spread out along a sufficient length of pipe. These limitations are broad enough to permit most practical problems to be treated by the method.