Flow structures govern particle collisions in turbulence
Fluid Dynamics
2019-03-27 v2 Chaotic Dynamics
Atmospheric and Oceanic Physics
Abstract
The role of the spatial structure of a turbulent flow in enhancing particle collision rates in suspensions is an open question. We show and quantify, as a function of particle inertia, the correlation between the multiscale structures of turbulence and particle collisions: Straining zones contribute predominantly to rapid head-on collisions compared to vortical regions. We also discover the importance of vortex-strain worm-rolls, which goes beyond ideas of preferential concentration and may explain the rapid growth of aggregates in natural processes, such as the initiation of rain in warm clouds.
Cite
@article{arxiv.1810.10285,
title = {Flow structures govern particle collisions in turbulence},
author = {Jason R. Picardo and Lokahith Agasthya and Rama Govindarajan and Samriddhi Sankar Ray},
journal= {arXiv preprint arXiv:1810.10285},
year = {2019}
}
Comments
10 pages, 5 figures