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Limiting relation for the eddy diffusivity close to a wall
Author(s) -
Son Jaime S.,
Hanratty Thomas J.
Publication year - 1967
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.690130419
Subject(s) - annulus (botany) , limiting , eddy diffusion , mechanics , thermal diffusivity , relation (database) , mass transfer , flow (mathematics) , physics , turbulence , thermodynamics , materials science , engineering , computer science , mechanical engineering , data mining , composite material
Experiments on mass transfer for fully developed flow in a pipe show that the eddy diffusivity for mass close to the wall is described by the functionality\documentclass{article}\pagestyle{empty}\begin{document}$$ \frac{\varepsilon} {\nu} = g({y^+}) $$\end{document}The best interpretation of presently available data in a pipe and in an annulus is given by the following, more explicit relation\documentclass{article}\pagestyle{empty}\begin{document}$$ \frac{\varepsilon} {\nu} = 0.00032y^{+ 4} $$\end{document}The evidence for this latter relation is not as conclusive as one would like. Accurate measurements of concentration profiles close to a wall are needed.