TURBULENT PRESSURE FLUCTUATIONS IN WATER WITH ADDITIVES

The pressure fluctuations at the wall beneath a turbulent boundary layer were measured for various concentrations of dilute polymer solutions to determine the effect of the polymer on the structure of the flow and to provide an insight into the mechanism causing the drag reduction which has been observed in such flows. The mechanism of drag reduction is explained in terms of a branching process involving energy transfer to the polymer molecules at an energy level which is lower than that of viscous dissipation. As a consequence of this mechanism there is also a reduction in the production of turbulent energy in order to maintain an equilibrium energy structure. (Author)

• Corporate Authors:

  University of Southampton

  Highfield Campus
  Southampton, Hampshire  United Kingdom  SO17 1BJ
• Authors:
  • MILLWARD, A
• Publication Date: 1971-9

Media Info

• Pagination: 71 p.

Subject/Index Terms

• TRT Terms: Additives; Atmospheric pressure; Boundary layer; Drag; Polymers; Turbulence; Turbulent boundary layer
• Old TRIS Terms: Drag reduction; Polymer additives; Pressure fluctuations
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00033643
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: Final Rpt
• Contract Numbers: F61052-67-C-0086
• Files: TRIS
• Created Date: Aug 25 1972 12:00AM