TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE

Science journal

 
ISSN (print) 2542-2324 /(online) 2618-8244


Articles of The Transactions of KSRC








Physical nature of frictional resistance reduction in dilute polymer solutions in turbulent boundary layer flows



Full text article (in russian)

Year

 
2016

Issue

 
376

Volume

 
2

Pages

 
59–92

Caption

 
Physical nature of frictional resistance reduction in dilute polymer solutions in turbulent boundary layer flows

Authors

 
O. Orlov

Keywords

 
turbulent boundary layer, laminar sublayer, polymer solution, shear stress, Newtonian fluid, transverse vortices in viscous sublayer, globules of polymer’s macromolecules

Summary

 
Originally, the frictional resistance of surface in polymer solution flow is reduced due to attachment  of  macromolecules  to  the  surface  changing  the  physical  conditions  of  nonstationary flows generation in viscous sublayer. After the attachment, the macromolecules become a substance with dual physical nature: on the one hand, it is a new elastic part of wetted surface, on the other hand, it is an element of fluid medium. The macromolecules at the surface interact with flow in viscous sublayer at fluid-solid interface. This interaction is decreasing the resistance. All subsequent changes of flow in polymer solutions boundary layer occur due to reduction of shear stresses at the surface following the laws of semi-empirical theory of Newtonian fluid boundary layer.

Rubrics

 
Naval architecture

Back to the list



 





 
Login:
Password:
Register
Forgot your password?


Last issues

All rights reserved © Krylov state research centre, 2017 — 2022


ISSN (print) 2542-2324 / ISSN (online) 2618-8244

Address: Moskovskoye shosse, 44, Saint-Petersburg, 196158

Phone: +7(812) 415-49-80