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Fluid friction and heat transfer in plain, concentric annuli
Author(s) -
Ratkowsky D. A.
Publication year - 1966
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.5450440102
Subject(s) - annulus (botany) , reynolds number , radius , concentric , mechanics , flow (mathematics) , kinetic energy , heat transfer , friction factor , thermodynamics , physics , mathematics , geometry , materials science , turbulence , classical mechanics , composite material , computer security , computer science
Each of the two friction factors in an annulus is defined in terms of the average kinetic energy of the fluid in the region between the radius of maximum velocity and the appropriate wall. These friction factors thus defined can be uniquely correlated against corresponding Reynolds numbers. The correlation is excellent for the outer portion of flow for all values of the radius ratio r 1 / r 2 , but not as good for the inner region of flow when r 1 / r 2 is small. Applying the Colburn analogy, inner and outer wall j‐factors are similarly correlated with the same degree of accuracy.