DIFFUSION OF POLYMER ADDITIVES IN A DEVELOPING TURBULENT BOUNDARY LAYER

The results of an experimental study of the diffusion of water and aqueous polymer when tangentially injected from a line slot into a two-dimensional external turbulent boundary layer formed on a flat plate are presented. Concentration profiles were obtained by adding a tracer dye to the injected liquid and measuring the fluorescence, using a spectrophotometer, of samples taken from the flowfield. Empirical equations describing the transverse and longitudinal concentration field for given injections and flow parameters are presented. The results show that turbulent diffusion of polymer solution is suppressed compared to that of water when the concentration at the walls is higher than 0.75 wppm (weight parts per million) but increased below this value. The data also confirm the deduction of others that a series of regions can be defined, and that their length is dependent on the injection concentration and flow rate. A universal concentration profile is described for the final region which is in agreement with the observations of others.

• Corporate Authors:

  American Institute of Aeronautics and Astronautics

  1290 Avenue of the Americas
  New York, NY  United States  10019
• Authors:
  • Latto, B
  • El Riedy, OKF
• Publication Date: 1976-10

Media Info

• Features: Figures; References;
• Pagination: p. 135-139
• Serial:
  • Journal of Hydronautics
  • Volume: 10
  • Issue Number: 4
  • Publisher: American Institute of Aeronautics and Astronautics

Subject/Index Terms

• TRT Terms: Additives; Atmospheric diffusion; Boundary layer; Boundary layer flow; Polymers; Turbulence; Turbulent boundary layer
• Old TRIS Terms: Concentration profiles; Polymer additives; Turbulent diffusion
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00148577
• Record Type: Publication
• Source Agency: American Institute of Aeronautics and Astronautics
• Files: TRIS
• Created Date: Feb 23 1977 12:00AM