CFD simulation of unexpected trapping of particles at a T junction

Supplementary video from the paper "Unexpected trapping of particles at a T junction," authored by Daniele Vigolo (a), Stefan Radl (b), and Howard A. Stone (a), published in PNAS Early Edition http://www.pnas.org/content/early/2014/03/12/1321585111.abstract Author Affiliations: (a) Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544; and (b) Institute for Process and Particle Engineering, Graz University of Technology, 8010 Graz, Austria Movie S2. Interaction of particles with vortical flow structures at a T junction to explain the trapping mechanism. Euler--Lagrange simulations; all simulations use ρp/ρf=0.15. Part 1: small particles with dp=0.01 at Re=250 cannot accumulate in the vortices; Part 2: large particles with dp=0.1 at Re=250 can enter the vortex, but exit axially; Part 3: large particles with dp = 0.1 at Re = 360 enter the vortex, and get trapped; Part 4: trapping of large particles with dp = 0.1 in unsteady flows.