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Laminar‐turbulent transitional flow phenomena in isosceles triangular cross‐section ducts
Author(s) -
Hanks Richard W.,
Cope Richard C.
Publication year - 1970
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.690160405
Subject(s) - laminar flow , turbulence , isosceles triangle , mechanics , shear stress , flow (mathematics) , newtonian fluid , open channel flow , physics , classical mechanics , geometry , mathematics
A theoretical analysis of the laminar‐turbulent transition phenomenon is presented for the case of steady, isothermal, fully developed flow of Newtonian fluids in straight ducts of constant isosceles triangular cross section. As a result of this analysis, the simultaneous existence of macroscopically large stable regions of laminar and turbulent flow are predicted to occur during the transition phenomenon. The existence of this special type of flow field, which has not been previously predicted theoretically, is shown to be a consequence of the presence of an asymmetric shear stress distribution. The results of an experimental study are also presented. These data verify the predictions made by the theoretical analysis.