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Polymer additives alter bubble-induced turbulence in fluids. Even without shear, polymers create steeper energy spectra, enhancing flow coherence and demonstrating viscoelastic effects in multiphase systems.

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Area of Science:

  • Fluid Dynamics
  • Rheology
  • Multiphase Flow

Background:

  • Bubble swarms in fluids generate pseudoturbulence.
  • Polymer additives are known to modify fluid properties.

Purpose of the Study:

  • Investigate the impact of polymer additives on bubble-induced pseudoturbulence.
  • Characterize changes in energy spectra and flow coherence.

Main Methods:

  • Experimental study of bubble swarms in polymer solutions.
  • Analysis of velocity fluctuations and energy spectra.
  • Lagrangian stretching statistics to assess flow coherence.

Main Results:

  • A critical polymer concentration induces steeper energy spectra (k scaling).
  • This new scaling is independent of gas volume fraction in the inertial limit.
  • Polymers enhance flow coherence, evidenced by Lagrangian stretching statistics.

Conclusions:

  • Viscoelastic effects significantly modify bubble-induced turbulence, even in shear-free conditions.
  • Polymer additives play a crucial role in altering multiphase flow characteristics.
  • Findings offer new insights into elastic stresses in complex fluids.