A general correlation for turbulent friction factors in non-Newtonian fluids
arXiv:1009.0968
Abstract
Correlations of friction factors are presented for the general case of purely viscous non-Newtonian fluids without requiring a priori the adoption of a rheological model. They are based on an empirical estimate of the shift in the wall layer edge and the Kolmogorov point. The predictions of friction factors have the same level of accuracy as those of the Dodge-Metzner correlation but the visualisation is more compatible with measured velocity profiles. The general correlations obtained can be used to easily retrieve correlations for specific rheological models.
17 pages, 5 figures; Key words: Turbulent pipe flow, friction factor, rheological models, power law, Bingham plastic, Ellis models