title: Drag reduction by polymer additives from turbulent spectra.
abstract: We extend the analysis of the friction factor for turbulent pipe flow reported by G. Gioia and P. Chakraborty [Phys. Rev. Lett. 96, 044502 (2006)] to the case where drag is reduced by polymer additives.
authors.affiliation: Departamento de Física, FCEN, Universidad de Buenos Aires, and IFIBA-CONICET, Buenos Aires, Argentina. calzetta@df.uba.ar
authors.forename: Esteban
authors.initials: E
authors.lastname: Calzetta