Lowering mechanical degradation of drag reducers in turbulent flow
- 1 January 2007
- journal article
- Published by Springer Science and Business Media LLC in Journal of Materials Research
- Vol. 22 (1), 56-60
- https://doi.org/10.1557/jmr.2007.0003
Abstract
Drag reduction (DR) agents are used in several ppm concentrations to accelerate significantly the flow through conduits in oil pipelines, oil well operations, flood water disposal, fire fighting, field irrigation, transport of suspensions and slurries, sewage systems, water heating and cooling systems, airplane tank filling, marine systems, and also in biomedical systems including blood flow. The drag reduction agents are typically high molecular mass polymers; in industrial applications they undergo mechanical degradation in turbulent flow. We provide an equation that describes quantitatively the degradation, thus predicting drag reduction as a function of time and of the concentration of the drag reduction agent. We report how grafting a polymer on the backbone of a different polymer affects the drag reduction efficacy. Our grafted polymer undergoes degradation by flow turbulence more slowly and also provides high levels of drag reduction efficacy at much lower concentrations than homopolymers do.Keywords
This publication has 30 references indexed in Scilit:
- Universal drag reduction characteristics of polyisobutylene in a rotating disk apparatusPolymer, 1999
- Grafted amylopectin: applications in flocculationColloids and Surfaces A: Physicochemical and Engineering Aspects, 1998
- Chain overlap and entanglements in dilute polymer solutions: Brownian dynamics simulationMacromolecular Theory and Simulations, 1995
- Slow crack propagation in polyethylene: determination and predictionPolymer, 1991
- Flow of dilute polymer solutions: chain conformations and degradation of drag reducersMacromolecules, 1990
- Screening and excess low-angle scattering in semidilute solutions of polystyrene in benzenePolymer, 1988
- Enhanced drag reduction via Interpolymer AssociationsJournal of Non-Newtonian Fluid Mechanics, 1987
- Numerical evaluation of screening length and anomalous small-angle X-ray scattering of polystyrene in benzenePolymer, 1987
- Flow‐assisted degradation in dilute polystyrene solutionsPolymer Engineering & Science, 1980
- Effects of solvent nature on the mechanical degradation of high polymer solutionsJournal of Applied Polymer Science, 1978