Abstract
A new method for tracking both position and orientation of non-spherical particles under free-fall conditions in water has been developed. The particles are recorded with background illumination in a water tank. Two cameras with 90◦ between camera axes allow for stereoscopic reconstruction. The implementation is done in Python using the toolbox OpenCV (Open Computer Vision). Contours around each particle image are determined. The contours are compared to back-projected contours from a three-dimensional model of the particle that is rotated to different orientations to find the best match. The method is tested on three cuboid shapes: a cube, a short rod with a square cross section and a rectangular flat cuboid. The latter falls with periodic oscillations while the two first show more advanced dynamics. Reynolds number based on terminal velocity of the particle is in the order of 250. It is also shown that a particle falling in the wake of another particle can get a significant change in terminal velocity and rotational dynamics
Original language | English |
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Title of host publication | Proceedings of the 15th International Symposium on Particle Image Velocimetry – ISPIV 2023 |
Number of pages | 8 |
Publisher | International Symposium on Particle Image Velocimetry |
Publication date | 2023 |
Publication status | Published - 2023 |
Event | 15th International Symposium on Particle Image Velocimetry - San Diego State University, San Diego, United States Duration: 19 Jun 2023 → 21 Jun 2023 Conference number: 15 https://piv.sdsu.edu/ |
Conference
Conference | 15th International Symposium on Particle Image Velocimetry |
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Number | 15 |
Location | San Diego State University |
Country/Territory | United States |
City | San Diego |
Period | 19/06/2023 → 21/06/2023 |
Internet address |