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Related Experiment Videos

Transition to turbulence in particulate pipe flow.

J-P Matas1, J F Morris, E Guazzelli

  • 1IUSTI-CNRS UMR 6595, Polytech'Marseille, Technopôle de Château-Gombert, 13453 Marseille Cedex 13, France.

Physical Review Letters
|February 7, 2003
PubMed
Summary

Suspended particles influence the transition to turbulence in fluids. Particle concentration and pipe-to-particle diameter ratios alter turbulence onset, with a proposed scaling law unifying these effects.

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Area of Science:

  • Fluid dynamics
  • Turbulence research
  • Particle-laden flows

Background:

  • Understanding the transition to turbulence is crucial in fluid mechanics.
  • The effect of suspended particles on flow stability is not fully understood.
  • Previous studies have not comprehensively addressed neutrally buoyant particle effects.

Purpose of the Study:

  • To experimentally investigate how suspended particles affect the transition to turbulence.
  • To determine the influence of particle concentration and diameter ratios on turbulence onset.
  • To develop a predictive model for particle-induced turbulence transition.

Main Methods:

  • Experiments were conducted using monodisperse, neutrally buoyant particles in a liquid.
  • Varying concentrations and pipe-to-particle diameter ratios were tested.

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  • The critical Reynolds number for the transition to turbulence was measured.

    • Main Results:

    • The transition to turbulence is delayed for large pipe-to-particle diameter ratios.
    • The transition to turbulence is hastened for small pipe-to-particle diameter ratios.
    • A scaling law was developed to correlate the departure from the critical Reynolds number with particle concentration.

    Conclusions:

    • Suspended particles significantly alter the critical Reynolds number for turbulence.
    • Both particle concentration and relative size are key parameters in particle-laden flow transitions.
    • The proposed scaling law offers a unified approach to predict turbulence onset in such flows.