| Issue |
Europhys. Lett.
Volume 68, Number 6, December 2004
|
|
|---|---|---|
| Page(s) | 825 - 831 | |
| Section | Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics | |
| DOI | https://doi.org/10.1209/epl/i2004-10282-6 | |
| Published online | 17 November 2004 | |
Saturation of turbulent drag reduction in dilute polymer solutions
1
Dipartimento di Fisica and INFM, Università “Tor Vergata” Via della Ricerca Scientifica 1, I-00133 Roma, Italy
2
Department of Chemical Physics, The Weizmann Institute of Science Rehovot, 76100 Israel
Received:
15
June
2004
Accepted:
15
October
2004
Drag reduction by polymers in turbulent wall-bounded flows
exhibits universal and non-universal aspects. The universal
maximal mean-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
, concentration of polymer 
and the degree of
polymerization 
. We explain the mechanism of
saturation stemming from the finiteness of extensibility of the
polymers, predict its dependence on and N in the
limit of small and large , and present the
excellent comparison of our predictions to experiments on drag
reduction by DNA.
PACS: 47.27.-i – Turbulent flows, convection, and heat transfer / 47.27.Ak – Fundamentals / 47.27.Nz – Boundary layer and shear turbulence
© EDP Sciences, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.