TURBULENT DRAG REDUCTION POLYMERIC SOLUTIONS

The paper presents the results of a comprehensive analytical and experimental program on the effect of additives, mainly long-chain molecules, on drag reduction in turbulent flow of aqueous polymeric solutions. The intent of the study was to develop a basic understanding, deduced from the experimental observations, of the underlying physical mechanism responsible for the phenomenon. The paper assumes that the turbulent drag reduction of solutions of high-polymers is due to the damping of turbulent fluctuations by the interspersed polymers, thereby suppressing the generation of turbulence in the viscous sublayer of the flow. Transition itself would also be restrained at sufficiently great polymer concentrations. The basic experiment is the measurement of the friction factor versus Reynolds number for flow in a pipe for various concentrations of a given polymer dissolved in water. The experimental data on drag reduction are interpreted in terms of additive concentration, pipe diameter, and a hydraulic damping thickness analogous to the hydraulic roughness of rough surfaces. Formulas are accordingly derived for velocity profile and friction factor. ( Author )

  • Supplemental Notes:
    • Proceedings of the American Institute of Aeronautics & Astronautics Aerospace Sciences Meeting ( 8th ), New York, New York, 19-21JAN70
  • Corporate Authors:

    American Institute of Aeronautics and Astronautics

    1290 Avenue of the Americas
    New York, NY  USA  10019

    North American Rockwell Corporation

    2300 East Imperial Highway
    El Segundo, CA  USA  90245
  • Authors:
    • Van Driest, E R
  • Publication Date: 1970-1-21

Media Info

  • Pagination: 37 p.

Subject/Index Terms

  • Subject Areas: Design; Environment; Marine Transportation;

Filing Info

  • Accession Number: 00005996
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: AFOSR-70-0593TR Paper, 70-56
  • Contract Numbers: AF49 ( 638 )-1442
  • Files: TRIS
  • Created Date: Nov 25 1974 12:00AM