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  United States 
• Authors:
  • Tullis, J P
  • Ramu, KLV
• Publication Date: 1973-11

Media Info

• Pagination: 61 p.

Subject/Index Terms

• TRT Terms: Additives; Drag; Polymers; Roughness; Velocity
• Old TRIS Terms: Concentration profiles; Drag reduction; Polymer additives; Velocity profiles
• Subject Areas: Design; Marine Transportation;

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