Particle Image Velocimetry (PIV) by TSI Inc.

piv-perex-02.jpg Particle Image Velocimetry is an advanced optical visualization and measuring method for research and diagnostics of fluid flow under laboratory or field operating conditions. It makes use of a laser light sheet that illuminates the investigated region where the fluid flow is visualized by introducing the particles into the fluid. A velocity vector map is evaluated from the two subsequent images of highlighted particles taken by CCD camera. The department runs a high performance, custom-made PIV system and a small size, portable standard system; both by TSI Incorporated.


  • high energy pulse Nd:YAG laser, beam energy 250 mJ at 532 nm
  • light sheet thickness between 0.5 and 5 mm
  • stereoscopic camera arrangement with Scheimpflug lens, resolution 1280 × 1024 pixels
  • observable area from 5 × 5 cm2 to 2 × 2 m2, resolution up to 5 μm/pixel with inspection area 4 × 3 mm if a microscope objective is applied
  • two/three-component velocity within a plane (2D2C ÷ 2D3C), no need for velocity calibration
  • image capture frequency up to 10 Hz
  • recording of cyclic and phase-resolved phenomena


Typical applications

  • research into fluid dynamics and turbulence, sprays and combustion processes, jet mixing, boundary layer flow
  • studies of aerodynamics and hydrodynamics in free/unbounded environment and transparent models
  • single-phase fluid flow, two-phase (liquid-gas, liquid-solid particles, sprays) flow
  • method is suitable for unsteady flow exhibiting changes in flow direction
  • experimental validation of computer models (CFD)

Provided outcomes

  • 2C – 3C velocity vectors of flow in a plane, sequential scanning for complete 3D investigated domain measurement
  • instantaneous and averaged flow patterns
  • advanced flow pattern processing: average and rms velocity components in the plane, turbulence intensity, turbulence visualization, vorticity distribution, streamlines, lines of constant speed, particle trajectory, shear stress and other spatial characteristics
  • possibility to evaluate a mass flow rate of the liquid when combined with Laser-Induced Fluorescence method

Related publications

Contact person

Jan Jedelsky, Ph.D., Associate Professor
phone: +420 54114 3266 | e-mail: jedelsky@fme_vutbr_cz

Energy Institute, Department of Thermodynamics and Environmetal Engineering
Faculty of Mechanical Engineering, Brno University of Technology
Technicka 2896/2, 616 69 Brno, Czech Republic

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