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Distribution of eddy viscosity and mixing length in smooth tubes
Author(s) -
Rothfus R. R.,
Archer D. H.,
Sikchi K. G.
Publication year - 1958
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.690040106
Subject(s) - reynolds number , prandtl number , mixing (physics) , turbulence , mechanics , turbulent prandtl number , mixing length model , thermodynamics , tube (container) , viscosity , turbulence modeling , isothermal process , materials science , heat transfer , physics , nusselt number , quantum mechanics , composite material
Profiles of eddy viscosity and Prandtl mixing length in fluids flowing steadily and isothermally in smooth tubes have been calculated from the velocity data of several investigators for Reynolds numbers between 1.2 × 10 3 and 3.2 × 10 6 . In the transition range unusually high values of eddy viscosity and mixing length are obtained in some portions of the stream. In the fully turbulent range the effect of Reynolds number is small and the mixing length tends toward zero at the center of the tube. The parameters for turbulent flow between parallel plates have been correlated through the concept of an equivalent tube. The results are of importance in designing equipment for heat and mass transfer and mixing.