SOME EFFECTS OF STORAGE AND SHEAR HISTORY ON THE FRICTION REDUCING PROPERTIES OF DILUTE POLYMER SOLUTIONS

The drag reducing properties of two dilute polymer solutions were studied using a simple turbulent pipe flow apparatus under various conditions of storage and mechanical degradation. Aqueous solutions of Polyox WSR-301 (polyethylene oxide) and Separan AP-30 (polyacrylamide) were prepared at 500 PPMW and then diluted into weak concentrations for storage and testing on a day by day basis. Data which display the friction reducing effectiveness as a function of aging and repeated shear degradation are presented for both polymers. At concentrations of 10, 25, 50 and 100 PPMW, aged samples showed the same 'peak' effectiveness as freshly prepared ones. However, the aging process reduced all the ability to resist mechanical degradation. Anomalies were found in which solutions tend to partially recover from shear degradation under certain conditions, and in other cases tend to improve their friction reducing efficiency after continuous shearing. Experimental results suggest that entanglement or aggregation of polymer molecules could be one of the important mechanisms involved in friction reduction. (Author)

  • Supplemental Notes:
    • Presented At AIAA/Navy Marine Systems, Propulsion and ASW Meeting, Newport, R.I., 4-6 May 70.
  • Corporate Authors:

    University of California, La Jolla

    La Jolla, CA  USA  92037
  • Authors:
    • Ellis, A T
    • Ting, R Y
    • Nadolink, R H
  • Publication Date: 1970

Media Info

  • Pagination: 8 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00024760
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: AIAA-70-532 Res Rept
  • Contract Numbers: N00014-69-A02006004
  • Files: TRIS
  • Created Date: Jan 14 1972 12:00AM