DIFFUSION OF A TANGENTIAL DRAG-REDUCING POLYMER INJECTION ON A FLAT PLATE AT HIGH REYNOLDS NUMBERS

The diffusion of a thin tangential jet of an aqueous solution of drag-reducing polymer injected into the water- turbulent boundary layer of a flat plate at a freestream Reynolds number, 3.6 x 10 to the seventh power, and the accompanying drag reduction are investigated for a variety of initial concentrations and ratios of injection to freestream velocities. The concentration distribution along the wall is found to be mainly represented by two regions. In the first region the wall concentration is practically constant and equal to the injected one; in the second region the concentration varies approximately as the inverse of the distance from the injection slit. The length of the first region is significantly increased by the polymer solution injection as compared with the pure solvent injection. The drag-reduction effect associated with the polymer injection depends on the trailing-edge concentration achieved as a result of the diffusion process.

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  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  USA  07306-2907
  • Authors:
    • Fruman, D H
    • Tulin, M P
  • Publication Date: 1976-9

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  • Accession Number: 00148190
  • Record Type: Publication
  • Source Agency: Society of Naval Architects and Marine Engineers
  • Files: TRIS
  • Created Date: Feb 16 1977 12:00AM