Use of PIV I — Lesson 2

This lesson covers the fundamental aspects of Particle Image Velocimetry (PIV), a technique used to measure chaotic flows. The lesson begins with an explanation of what PIV is and how it works, including the use of light sources and seeding particles to illuminate a specific area of the flow field. The lesson then delves into the working principle of PIV, explaining how the velocity of the fluid is calculated by measuring the velocity of the particles. The lesson also discusses the importance of image processing and correlation in obtaining accurate measurements. For instance, it's like using a camera to capture the movement of a group of birds in the sky, then analyzing the images to determine the speed and direction of the birds' flight.

Video Highlights

01:03 - Working principle of PIV
03:38 - Use of light sources and seeding particles
12:46 - Importance of image processing and correlation in PIV
28:01 - Stroboscopic effect
38:35 - Conversion of displacement vectors into raw velocity vectors

Key Takeaways

- Particle Image Velocimetry (PIV) is a technique used to measure chaotic flows by illuminating a specific area of the flow field using light sources and seeding particles.
- The velocity of the fluid is calculated by measuring the velocity of the particles.
- The process of image processing and correlation is crucial in obtaining accurate measurements in PIV.
- The stroboscopic effect, which represents a moving object by a series of short instantaneous movements, is an important concept in PIV.