VISCOUS DRAG REDUCTION IN DEVELOPING PIPE FLOW

The characteristics of flow in the entrance region of a rough pipe were studied for water flow and for polymer injection into a boundary layer in a 12-in. diam, 200-ft long steel pipe. The tests without injection provided information on the velocity profile and boundary layer development. A mathematical model was developed for predicting boundary layer thickness, core velocity, and pressure coefficient in the inlet region. Polymer was injected through a perforated wall pipe section located 3.5 pipe diameters from the pipe inlet. Drag reduction, degradation, velocity and concentration profiles were measured. (Modified author abstract)

  • Corporate Authors:

    Colorado State University, Fort Collins

    Hydro Machinery Laboratory
    Fort Collins, CO  USA 
  • Authors:
    • Tullis, J P
    • Ramu, KLV
  • Publication Date: 1973-11

Media Info

  • Pagination: 61 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00052235
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: HM-34
  • Contract Numbers: N00014-67A-0299-0021
  • Files: TRIS
  • Created Date: May 7 1974 12:00AM