Particle Tracking of Orientation and Velocity of Arbitrary Shape

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Abstract

A method for tracking position and orientation of regular and irregular particles is developed. The method uses two perpendicular cameras and the computer vision library OpenCV. It allows for simultaneous tracking of 3 translational and 3 rotational degrees of freedom and for multiple particles trailing each other. The method requires a model of the geometric shape of the particle to measure orientation. The model is projected to both cameras and compared to shadow images of the real particle. The method is validated by using synthetic data. Three regular particles are used, a cube, a short rod and a flat plate. Irregular particles are obtained from a plastic granulation process. A total of 10 irregular particles are used. The fluid medium is room temperature water and the particle densities are approximately 1030 kg/m3 and 1420 kg/m3 for the regular and irregular particles respectively. The Reynolds number for the irregular particles vary between 550 < Rep < 850 for the regular particles it is Rep ≈ 250. The particle drag coefficients and their change in rotation is discussed. The variation in orientation is observed to be linked to the aspect ratio however with notable outliers. Irregular particles falling in distinct modes are observed and four are selected and further analyzed showing the close link between instantaneous velocity and orientation
Original languageEnglish
Title of host publicationProceedings of the 21st International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics 2024
Number of pages26
Publication date2024
ISBN (Print)978-989-53637-1-1
DOIs
Publication statusPublished - 2024
Event21st International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics - Lisbon, Portugal
Duration: 8 Jul 202411 Jul 2024

Conference

Conference21st International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics
Country/TerritoryPortugal
CityLisbon
Period08/07/202411/07/2024

Keywords

  • Non-spherical particles,
  • Irregular particles
  • Settling
  • Shadow imaging

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