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Related Experiment Videos

Passive scalar intermittency in low temperature helium flows.

F Moisy1, H Willaime, J S Andersen

  • 1Laboratoire de Physique Statistique, ENS, 24 rue Lhomond, 75231 Paris Cedex 05, France.

Physical Review Letters
|June 1, 2001
PubMed
Summary

Researchers measured passive temperature field mixing in turbulent flow using low-temperature helium gas. Findings reveal temperature structure function exponents saturate, indicating front-like structures dominate, with cliff widths scaling to the Kolmogorov length scale.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Turbulence Research

Background:

  • Understanding passive scalar mixing in turbulent flows is crucial for various scientific and engineering applications.
  • Previous studies have explored temperature fluctuations but lacked measurements across a wide range of microscale Reynolds numbers.

Purpose of the Study:

  • To investigate the mixing of a passive temperature field in turbulent flow.
  • To analyze the scaling properties of temperature structure functions and identify dominant statistical structures.
  • To determine the relationship between the characteristics of these structures and fundamental turbulence scales.

Main Methods:

  • Utilized low-temperature helium gas to achieve a microscale Reynolds number range (R(lambda)) from 100 to 650.
  • Performed new measurements of passive temperature field mixing.

Related Experiment Videos

  • Analyzed temperature structure functions, specifically the exponents xi(n) for orders up to n=10.

    • Main Results:

    • Observed saturation of temperature structure function exponents xi(n) to xi(infinity) ≈ 1.45 ± 0.1 for higher orders (n ≈ 10).
    • Identified this saturation as a signature of statistics dominated by front-like structures, termed 'cliffs'.
    • Quantified cliff characteristics, demonstrating their widths scale with the Kolmogorov length scale.

    Conclusions:

    • The study provides novel insights into passive scalar mixing in turbulent flows.
    • The findings confirm the significant role of intermittent, front-like structures in shaping temperature statistics.
    • The observed scaling of cliff widths offers a direct link between intermittent structures and the dissipative scales of turbulence.