Drag reduction by polymers in turbulent wall-bounded flows exhibits universal and non-universal aspects. The universal maximal moan-velocity profile was explained in a recent theory. The saturation of this profile and the crossover back to the Newtonian plug are non-universal, depending on Reynolds number Re, concentration of polymer cp and the degree of polymerization N p. We explain the mechanism of saturation stemming from the finiteness of extensibility of the polymers, predict its dependence on c p and N in the limit of small cp and large Re, and present the excellent comparison of our predictions to experiments on drag reduction by DNA.

Benzi, R., L'Vov, V., Procaccia, I., Tiberkevich, V. (2004). Saturation of turbulent drag reduction in dilute polymer solutions. EUROPHYSICS LETTERS, 68(6), 825-831 [10.1209/epl/i2004-10282-6].

Saturation of turbulent drag reduction in dilute polymer solutions

BENZI, ROBERTO;
2004-01-01

Abstract

Drag reduction by polymers in turbulent wall-bounded flows exhibits universal and non-universal aspects. The universal maximal moan-velocity profile was explained in a recent theory. The saturation of this profile and the crossover back to the Newtonian plug are non-universal, depending on Reynolds number Re, concentration of polymer cp and the degree of polymerization N p. We explain the mechanism of saturation stemming from the finiteness of extensibility of the polymers, predict its dependence on c p and N in the limit of small cp and large Re, and present the excellent comparison of our predictions to experiments on drag reduction by DNA.
2004
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/02 - FISICA TEORICA, MODELLI E METODI MATEMATICI
English
Con Impact Factor ISI
Fluid dynamics, turbulence, drag reduction, polymers
Benzi, R., L'Vov, V., Procaccia, I., Tiberkevich, V. (2004). Saturation of turbulent drag reduction in dilute polymer solutions. EUROPHYSICS LETTERS, 68(6), 825-831 [10.1209/epl/i2004-10282-6].
Benzi, R; L'Vov, V; Procaccia, I; Tiberkevich, V
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/32893
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