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Bubbly turbulent drag reduction is a boundary layer effect.

Thomas H van den Berg1, Dennis P M van Gils, Daniel P Lathrop

  • 1Department of Applied Physics, IMPACT, and J.M. Burgers Center for Fluid Dynamics, Physics of Fluids Group, University of Twente, P.O. Box 217, 7500 AE Enschede, Netherlands.

Physical Review Letters
|March 16, 2007
PubMed
Summary

Injecting bubbles into turbulent Taylor-Couette flow with rough walls increases dimensionless drag. This suggests bubbly drag reduction is a boundary layer effect, not a bulk flow phenomenon.

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Area of Science:

  • Fluid Dynamics
  • Turbulence Research
  • Multiphase Flow

Background:

  • Turbulent Taylor-Couette flow is a key model for studying fluid dynamics.
  • Bubble injection typically reduces drag, while rough walls increase it.
  • Understanding interactions between bubbles and wall roughness is crucial.

Purpose of the Study:

  • To investigate the effect of bubble injection on turbulent Taylor-Couette flow with rough walls.
  • To determine if bubbles can reduce drag in the presence of wall roughness.
  • To elucidate the mechanism of bubbly drag reduction.

Main Methods:

  • Experimental study of turbulent Taylor-Couette flow.
  • Controlled injection of bubbles into the flow.
  • Varying Reynolds number up to 4 x 10^5.
  • Measurement of drag forces on rough walls.

Main Results:

  • Dimensionless drag was enhanced in the presence of bubbles and rough walls.
  • Dimensional drag remained unchanged.
  • Smooth boundary layers could not form due to wall roughness.

Conclusions:

  • Bubble injection does not reduce drag when walls are rough.
  • Bubbly drag reduction is confirmed as a phenomenon exclusive to smooth boundary layers.
  • Wall roughness negates the drag-reducing effects of bubbles in this flow regime.