Title

Roles of Molecular Structure and Solvation on Drag Reduction in Aqueous Solutions

Document Type

Article

Publication Date

1991

Department

Polymers and High Performance Materials

Abstract

Drag reduction performance of water-soluble copolymers tailored with specific structural features has been examined. These copolymers including polyelectrolytes, polyampholytes, and hydrophobically-modified polymers respond to changes in ionic strength as indicated by changes in hydrodynamic volume in aqueous solution. Drag reduction performance is greatly affected by polymer microstructure and by solvation. A new method of data representation in which drag reduction efficiency is shown as a function of volume fraction allows comparison of a large number of polymer types. Further normalization utilizing an empirical shift factor allows all data to fall on a single efficiency curve. Results of this study suggest that predictive dynamic extensional models might be improved by inclusion of parameters reflective of solvent and associative interactions as well as hydrodynamic volume.

Publication Title

ACS Symposium Series

Volume

467

First Page

320

Last Page

337