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Related Experiment Videos

Drag reduction by polymers in wall bounded turbulence.

Victor S L'vov1, Anna Pomyalov, Itamar Procaccia

  • 1Department of Chemical Physics, The Weizmann Institute of Science, Rehovot, 76100 Israel.

Physical Review Letters
|July 13, 2004
PubMed
Summary

Polymers reduce drag in turbulent flows by suppressing momentum transfer to the wall. This study explains the maximum drag reduction asymptote using fluid mechanics principles and experimental data.

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Area of Science:

  • Fluid Mechanics
  • Polymer Physics
  • Turbulence

Background:

  • Turbulent wall-bounded flows are crucial in many engineering applications.
  • Achieving significant drag reduction is a key challenge.
  • Polymers are known to reduce drag, but the mechanism requires further elucidation.

Purpose of the Study:

  • To elucidate the mechanism of drag reduction by polymers in turbulent wall-bounded flows.
  • To develop the phenomenology of the maximum drag reduction asymptote.
  • To validate the theoretical framework with experimental measurements.

Main Methods:

  • Analysis of fluid mechanics equations.
  • Development of a theoretical framework for polymer-induced drag reduction.
  • Comparison with experimental data using a single parameter.

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Main Results:

  • Polymer stretching suppresses momentum flux to the wall, leading to drag reduction.
  • A theoretical model for the maximum drag reduction asymptote was developed.
  • The model shows agreement with experimental measurements based on Newtonian fluid information.

Conclusions:

  • The study provides a fundamental understanding of polymer-mediated drag reduction.
  • The developed phenomenology accurately describes the maximum drag reduction asymptote.
  • The findings offer a pathway for optimizing drag reduction strategies in turbulent flows.