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Transistion from laminar to turbulent flow in pipes
Author(s) -
Ryan N. W.,
Johnson M. M.
Publication year - 1959
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.690050407
Subject(s) - laminar flow , turbulence , reynolds number , mechanics , laminar sublayer , newtonian fluid , pipe flow , flow (mathematics) , open channel flow , laminar flow reactor , flow separation , thermodynamics , mathematics , physics , classical mechanics
Abstract In pipeline design, for which one needs a means of ascertaining whether the flow will be laminar or turbulent, the Reynolds number is the criterion for Newtonian fluids. The principal purpose of this study was to formulate a more general criterion to characterize the flow regime and to test this form in application to non‐Newtonian fluids. Intuitive physical arguments suggested the use of a local stability parameter which is a function of the ratio of input energy to energy dissipation for an element of fluid. If the parameter is applied to a Newtonian fluid in laminar pipe flow, one finds that it has a maximum value of 0.385 times the critical Reynolds number, or 808. As the criterion is presumed to be general, it is inferred that the value of 808 defines the boundary between stable laminar and stable turbulent pipe flow for all fluids. The inference has been varified for several pseudoplastic fluids.