Turbulent Drag Reduction by Flexible and Rodlike Polymers: Crossover Effects at Small Concentrations
Chaotic Dynamics
2009-11-11 v1
Abstract
Drag reduction by polymers is bounded between two universal asymptotes, the von-K\'arm\'an log-law of the law and the Maximum Drag Reduction (MDR) asymptote. It is theoretically understood why the MDR asymptote is universal, independent of whether the polymers are flexible or rodlike. The cross-over behavior from the Newtonian von-K\'arm\'an log-law to the MDR is however not universal, showing different characteristics for flexible and rodlike polymers. In this paper we provide a theory for this cross-over phenomenology.
Keywords
Cite
@article{arxiv.nlin/0602055,
title = {Turbulent Drag Reduction by Flexible and Rodlike Polymers: Crossover Effects at Small Concentrations},
author = {Emily S. C. Ching and T. S. Lo and Itamar Procaccia},
journal= {arXiv preprint arXiv:nlin/0602055},
year = {2009}
}
Comments
5 pages, 4 figures, submitted to Physical Review E