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Related Experiment Video

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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

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Published on: February 27, 2016

Fluid particle accelerations in fully developed turbulence.

A La Porta¹, G A Voth, A M Crawford

¹Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853-2501, USA.

|March 10, 2001

Summary

This summary is machine-generated.

Researchers measured fluid particle accelerations in turbulent water flow, confirming Kolmogorov scaling at high Reynolds numbers. Particle accelerations were found to be highly intermittent, reaching extreme values.

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Area of Science:

Fluid dynamics
Turbulence research
Statistical physics

Background:

Particle motion in turbulent flows is crucial for transport and mixing.
Understanding fluid particle acceleration is key to validating turbulence theories like Kolmogorov's 1941 scaling.
Previous studies faced challenges in accurately measuring particle accelerations.

Purpose of the Study:

To experimentally investigate fluid particle accelerations in turbulent flow.
To test the Heisenberg-Yaglom prediction based on Kolmogorov's theory.
To quantify the intermittency and scaling of particle accelerations.

Main Methods:

Utilized a detector adapted from high-energy physics to track particles.
Conducted experiments in a laboratory water flow.
Achieved Reynolds numbers up to 63,000.

Main Results:

Observed Kolmogorov scaling of acceleration variance at high Reynolds numbers, within experimental error.
Found particle accelerations to be highly intermittent, with peaks up to 1,500 times gravity.
Noted that acceleration data reflect the large-scale flow's anisotropy across all tested Reynolds numbers.

Conclusions:

Experimental results support Kolmogorov's scaling theory for fluid particle accelerations in turbulence.
The extreme intermittency of acceleration highlights a key characteristic of turbulent flows.
Anisotropy of the large-scale flow influences particle acceleration at all scales studied.