PARTICLE IMAGE VELOCIMETRY Meaning and
Definition
-
Particle image velocimetry (PIV) is a non-intrusive optical technique used in fluid mechanics to quantitatively measure the velocity field of a fluid. It is employed to study the motion of particles in a fluid, enabling researchers to understand the behavior, dynamics, and properties of fluid flows. PIV involves the use of small tracer particles dispersed within the fluid, which are illuminated by a laser sheet. As the particles move with the flow, their positions are captured by a camera and analyzed to obtain velocity information.
The technique utilizes two consecutive images to extract the displacement of particles over a short time interval. By comparing the positions of the particles in the two images, the velocity vectors of the fluid can be determined through mathematical algorithms. These velocity vectors provide spatial and temporal information about the fluid flow, such as velocity magnitude, direction, and vorticity.
PIV has numerous applications in various fields, including aerospace engineering, environmental science, and biomedical research. It enables the investigation of complex flow phenomena, such as turbulence, boundary layers, and vortices. The technique has the advantage of being non-intrusive, allowing measurements to be made without disrupting or altering the behavior of the flow. PIV provides quantitative, high-resolution velocity data, making it a valuable tool for understanding and analyzing fluid dynamics.
