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Related Experiment Video

Updated: Sep 21, 2025

High-speed Particle Image Velocimetry Near Surfaces
11:59

High-speed Particle Image Velocimetry Near Surfaces

Published on: June 24, 2013

33.3K

Two-time interval method to circumvent particle image velocimetry dynamic range.

Sunil V Bharadwaj1, G R Vybhav1

  • 1Engineering Mechanics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India.

Methodsx
|May 27, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method using dual-timing particle image velocimetry (PIV) to accurately measure low and high velocities in fluid flows. The technique effectively identifies and corrects erroneous velocity vectors for improved flow field analysis.

Keywords:
EntrainmentPIVTurbulent jets

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Related Experiment Videos

Last Updated: Sep 21, 2025

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Area of Science:

  • Fluid Dynamics
  • Experimental Fluid Mechanics
  • Turbulence Research

Background:

  • Particle Image Velocimetry (PIV) systems often produce noisy velocity data outside their dynamic range, particularly at low velocities.
  • Accurate velocity measurements are crucial for understanding complex flow phenomena like turbulent jets.

Purpose of the Study:

  • To develop a robust method for resolving velocity measurements in both low and high velocity regimes using PIV.
  • To improve the accuracy of PIV by detecting and replacing erroneous velocity vectors.

Main Methods:

  • Utilizes two distinct pulsed laser timings to acquire two sets of PIV data, each within a PIV system's dynamic range.
  • Employs a median-test of residuals, incorporating a normalized residual median based on a universal outlier detector, to validate and merge data sets.
  • Compares PIV data acquired with an appropriate time-delay to identify and correct erroneous vectors.

Main Results:

  • Successfully resolves velocity measurements across a wider range, overcoming limitations of standard PIV in low-velocity regions.
  • Demonstrates accurate detection and replacement of erroneous velocity vectors by comparing dual-timed PIV data.
  • Validated against existing experimental data and direct numerical simulations (DNS) of a round turbulent jet.

Conclusions:

  • The proposed dual-timing PIV method enhances measurement accuracy and reliability in challenging flow conditions.
  • The technique enables the capture of instantaneous entrainment velocity, even in unsteady flow fields.
  • This approach provides a significant advancement for quantitative fluid dynamics research.