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Drag enhancement with polymers.

N François1, D Lasne, Y Amarouchene

  • 1Université Bordeaux 1, Centre de Physique Moléculaire Optique et Hertzienne (UMR 5798 CNRS), 351 cours de la Libération, 33405 Talence, France.

Physical Review Letters
|February 1, 2008
PubMed
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Adding polymers to fluid flow around a cylinder increases drag. This drag enhancement stems from polymer interactions that alter the flow field, creating higher shear and velocity fluctuations near the cylinder.

Area of Science:

  • Fluid dynamics
  • Polymer physics

Background:

  • Drag on cylindrical objects is a fundamental concept in fluid mechanics.
  • Polymer additives are known to influence fluid flow characteristics.

Purpose of the Study:

  • To investigate the effect of polymer presence on drag experienced by a cylinder.
  • To elucidate the relationship between polymer-flow interactions and drag enhancement.

Main Methods:

  • Experimental measurement of drag force on a cylinder in a polymer-modified flow.
  • Flow visualization and analysis in the vicinity of the cylinder.

Main Results:

  • A significant enhancement in drag was observed with the addition of polymers.
  • The presence of polymers induced higher shear rates and increased velocity fluctuations.

Related Experiment Videos

  • Molecular elongation of polymers was noted in the modified flow field.

    • Conclusions:

    • Polymer additives enhance drag on cylinders by fundamentally altering the surrounding flow dynamics.
    • The observed drag increase is a direct consequence of polymer-induced modifications, including shear bands and velocity fluctuations.