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Lagrangian particle tracking at large Reynolds numbers.

Christian Küchler1, Antonio Ibanez Landeta1, Jan Moláček1

  • 1Max-Planck-Institute for Dynamics and Self-Organisation, 37077 Göttingen, Germany.

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Summary

This study introduces a new Lagrangian particle tracking system for studying fluid turbulence. The setup enables high-resolution particle tracking at unprecedented Taylor scale Reynolds numbers, advancing turbulence research.

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Area of Science:

  • Fluid Dynamics
  • Turbulence Research
  • Particle Tracking

Background:

  • Lagrangian frame is ideal for studying transport and mixing in fluid turbulence.
  • Previous Lagrangian measurements were limited to lower Reynolds numbers (Rλ ≈ 10³).
  • Eulerian methods using hot-wire anemometry have been extensively studied but have limitations.

Purpose of the Study:

  • To present a novel Lagrangian particle tracking setup in the Max Planck Variable Density Turbulence Tunnel (VDTT).
  • To enable high-resolution particle tracking at high Taylor scale Reynolds numbers (100–6000).
  • To validate the suitability of specific tracer particles for this experimental setup.

Main Methods:

  • Detailed description of the imaging setup within a pressurized facility.
  • Utilized laser illumination and a specific particle seeding mechanism.
  • Employed KOBO Cellulobeads D-10 particles as tracers and analyzed their properties.

Main Results:

  • The VDTT setup successfully achieves Taylor scale Reynolds numbers between 100 and 6000.
  • KOBO Cellulobeads D-10 particles show no significant charge.
  • Particle inertia has a negligible impact on results across various experimental conditions.

Conclusions:

  • The presented Lagrangian particle tracking setup is suitable for high Reynolds number turbulence studies.
  • The validated tracer particles and methodology overcome previous limitations in Lagrangian measurements.
  • This work paves the way for more in-depth investigations of turbulent transport and mixing.