A Study of Molecular Parameters Influencing Polymer Drag Reduction.
Abstract
The effects of three molecular parameters on drag reduction were studied under turbulent-flow conditions. Drag reduction capability of linear polymers is altered by branching. Many short side chains decrease efficiency, while fewer but long branches increase it. The drag reduction of polyelectrolytes can be reversibly destroyed or enhanced by changes in configuration resulting from changes in pH or ionic strength or by complexing with counter-ion polyelectrolytes. Cross-linking can enhance or destroy the drag-reducing capability of a linear molecule, depending on the degree of cross-linking. Polymer degradation in turbulent flow is somewhat less in branched and cross-linked molecules than in linear ones.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1975
- Accession Number
- ADA020813
Entities
People
- Robert H. Wade
Organizations
- Naval Undersea Warfare Center