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Drag reduction by compressible bubbles.

T S Lo1, Victor S L'vov, Itamar Procaccia

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

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 12, 2006
PubMed
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Bubble dynamics significantly impact drag reduction in turbulent flows. Their compressibility, not just fluid property changes, is key to achieving substantial drag reduction, offering new avenues for flow control.

Area of Science:

  • Fluid dynamics
  • Turbulence research
  • Multiphase flow

Background:

  • Drag reduction is crucial for energy efficiency in fluid systems.
  • Previous studies focused on bubble-induced fluid property renormalization, yielding limited drag reduction.
  • The dynamical effects of bubbles, particularly compressibility, were underexplored.

Purpose of the Study:

  • To investigate the role of bubble compressibility in drag reduction within stationary turbulent flows.
  • To demonstrate how bubble dynamics, beyond simple fluid property changes, enhance drag reduction.
  • To quantify the potential for significant drag reduction through bubble compressibility.

Main Methods:

  • Simulations of turbulent flows with dispersed bubbles.
  • Analysis of bubble compressibility effects on mixture properties.

Related Experiment Videos

  • Comparison of drag reduction with and without considering bubble dynamics.

    • Main Results:

    • Bubble compressibility significantly amplifies drag reduction effects.
    • Dynamical compressibility effects lead to higher drag reduction than mere fluid property renormalization.
    • Substantial drag reduction is achievable by harnessing bubble compressibility.

    Conclusions:

    • Bubble compressibility is a critical factor for effective drag reduction in turbulent flows.
    • Exploiting bubble dynamics offers a promising strategy for advanced flow control.
    • This research opens new possibilities for energy-efficient fluid transport.