DRAG REDUCTION AND SHEAR DEGRADATION OF DILUTE POLYMER SOLUTIONS AS MEASURED BY A ROTATING DISK

A saturated drag-reduction line for dilute polymer solutions is derived for a rotating disk from new velocity-similarity laws. Drag reduction measured by a rotating disk is found to have three domains--oversaturated, optimal and undersaturated. At a given boundary-layer thickness and wall-shear stress, the drag- reduction increases with increasing concentration in the undersaturated domain, and the drag reduction does not increase with increasing concentration in the oversaturated domain. The boundary between the two domains is the optimal drag reduction, which is determined by the type of polymer and its concentration and a Reynolds number based on shear velocity and disk radius or boundary-layer thickness. (Author)

• Corporate Authors:

  Naval Ship Research and Development Center

  Washington, DC  United States 
• Authors:
  • Huang, T T
  • Santelli, N
• Publication Date: 1972-9

Media Info

• Pagination: 30 p.

Subject/Index Terms

• TRT Terms: Additives; Boundary layer flow; Drag; Polymers; Shear stress; Walls
• Old TRIS Terms: Drag reduction; Polymer additives; Wall shear stress
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00043216
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: NSRDC-3678
• Files: TRIS
• Created Date: Apr 6 1973 12:00AM