System for high resolution 3D Imaging of Non-Spherical Sedimenting Particles
Abstract
Anisotropic particles are observed sedimenting in turbulence in a wide range of applications from ice crystals in clouds to plankton in the oceans. However, a quantitative understanding of this seemingly simple problem has not been obtained except in the simple case of very small particles where Stokes flow solutions can be used. In June of 2015, the Army Research Office funded a collaborative project between the group of Donald Koch at Cornell and the group of the PI at Wesleyan to combine experimental, simulation, and theoretical analysis of this problem to explore the dynamics of sedimenting particles with a broad range of shapes, sizes, and sedimentation velocities. This proposal is for a new camera system to allow the experiments to obtain much more accurate 3D orientations of non-spherical particles and to allow revolutionary measurements of the 3D velocity field around the particles as they are advected in the flow. The grant funds purchase of four Phantom Veo 640S cameras from Vision Research which will allow us to (1) to increase the accuracy of the measured 3D trajectories and orientations of non-spherical particles and improve the measured solid body rotation rates, (2) to allow measurement of high resolution velocity fields around non-spherical particles along their trajectories using new algorithms for multi-camera image analysis, (3) to improve the precision so that measurements can resolve arm bending by fluid stresses acting on the particles and the rotational acceleration of the particles. This work on precision 3D imaging of non-spherical particles promises to improve our understanding of particles sedimenting in turbulence and moves forward the state-of-the art in quantitative imaging in dynamic environments.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Oct 23, 2018
- Source ID
- W911NF1710176
Entities
People
- Greg A. Voth
Organizations
- Army Contracting Command
- United States Army
- Wesleyan University