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Generalized correlation for friction loss in drag reducing polymer solutions
Author(s) -
Darby Ron,
Chang HsunFu D.
Publication year - 1984
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.690300216
Subject(s) - drag , friction factor , rheology , turbulence , tube (container) , viscoelasticity , mechanics , friction loss , dissipation , newtonian fluid , pipe flow , parasitic drag , flow (mathematics) , materials science , non newtonian fluid , thermodynamics , physics , composite material , reynolds number
Abstract The definition of the pipe flow friction factor has been extended to include the effect of fluid viscoelastic properties on energy dissipation in turbulent tube flow. The resulting friction factor includes a characteristic fluid relaxation time, which can be determined directly from rheological measurements, and reduces to the usual Fanning friction factor for inelastic fluids. The use of this more general friction factor enables turbulent tube flow data for both fresh and shear degraded “concentrated” drag reducing polymer solutions of various concentrations in various tube sizes to be correlated by the usual f vs. N Re relation for Newtonian fluids in smooth tubes.