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Related Experiment Video

Updated: May 9, 2026

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

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

Published on: February 27, 2016

Ghost particle velocimetry: accurate 3D flow visualization using standard lab equipment.

Stefano Buzzaccaro¹, Eleonora Secchi, Roberto Piazza

¹Department of Chemistry (CMIC), Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy. stefano.buzzaccaro@polimi.it

Physical Review Letters

|August 13, 2013

Summary

We introduce ghost particle velocimetry, a novel technique for microfluidic flow analysis. This method reconstructs 3D velocity profiles without perturbing the flow, even in turbid samples.

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Last Updated: May 9, 2026

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

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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

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Published on: June 24, 2013

Area of Science:

Fluid Dynamics
Microfluidics
Optical Measurement Techniques

Background:

Traditional particle velocimetry methods can perturb microfluidic flows.
Imaging techniques are crucial for analyzing fluid behavior at micro-scales.

Purpose of the Study:

To develop a non-perturbing particle velocimetry technique for microfluidic channels.
To enable 3D velocity profile reconstruction in microfluidic systems.

Main Methods:

Utilizing ghost particle velocimetry (GPV) by imaging and cross-correlating scattering speckle patterns.
Employing tracers or refractive-index fluctuations in the sample.
Leveraging a standard microscope with low-cost digital camera and specific illumination.

Main Results:

Successfully reconstructed velocity patterns in microfluidic channels without flow perturbation.
Achieved 3D profile reconstruction with a resolution of a few tenths of microns.
Demonstrated suitability for analyzing phase separation in liquid mixtures under shear.

Conclusions:

Ghost particle velocimetry offers a non-invasive method for microfluidic flow analysis.
The technique is versatile, applicable to various samples including turbid ones.
GPV provides high-resolution 3D velocity mapping with standard microscopy equipment.