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Communication Dans Un Congrès Année : 2016

A SHADOW PTV TECHNIQUE FOR PARTICLE TRACKING IN AN INHOMOGENEOUS TURBULENT FLOW

Résumé

We use a Shadow Particle Tracking Velocimetry technique (S-PTV) with collimated light to investigate the dynamics of a turbulent von Kármán (VK) flow of water. Such a PTV technique, easy to calibrate as apparent particle position on the images do not depend on the camera-particle distance, allows to track small objects (100 µm particles, fibers, ...) with low power LEDs as light sources. Investigating the dynamics of Lagrangian tracers, we observe the flow produced in a square tank is bistable, the two states having a life time of several minutes so that the high speed recordings appear as snapshots of one of the two states that can be reconstructed from the particle trajectories. We show the two states topologies strongly differ from the one of the mean flow, and how the bistability affects the dispersion of tracers.
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Dates et versions

hal-02519200 , version 1 (25-03-2020)

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  • HAL Id : hal-02519200 , version 1

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Peter Huck, Nathanaël Machicoane, Romain Volk. A SHADOW PTV TECHNIQUE FOR PARTICLE TRACKING IN AN INHOMOGENEOUS TURBULENT FLOW. 24th International Congress of Theoretical and Applied Mechanics (ICTAM 2016), Aug 2016, Montreal, Canada. ⟨hal-02519200⟩
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