Drag Reduction in Turbulent Wall-Bounded Flows of Realistic Polymer Solutions

Autor:	F. Serafini, F. Battista, P. Gualtieri, C. M. Casciola
Rok vydání:	2022
Předmět:	Friction Polymers Viscosity friction viscosity DNA polymers General Physics and Astronomy
Zdroj:	Physical Review Letters. 129
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.129.104502
Popis:	Suspensions of DNA macromolecules (0.8 wppm, 60 kbp), modeled as finitely extensible nonlinear elastic dumbbells coupled to the Newtonian fluid, show drag reduction up to 27% at friction Reynolds number 180, saturating at the previously unachieved Weissenberg number ≃10^{4}. At a large Weissenberg number, the drag reduction is entirely induced by the fully stretched polymers, as confirmed by the extensional viscosity field. The polymer extension is strongly non-Gaussian, in contrast to the assumptions of classical viscoelastic models.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a03650d000324300c7b0d5996bd5ba2c https://doi.org/10.1103/physrevlett.129.104502 Zobrazit plný text záznamu