Invisible Anchors Trap Particles in Branching Junctions.

Publication Year
2018

Type

Journal Article
Abstract

We combine numerical simulations and an analytic approach to show that the capture of finite, inertial particles during flow in branching junctions is due to invisible, anchor-shaped three-dimensional flow structures. These Reynolds-number-dependent anchors define trapping regions that confine particles to the junction. For a wide range of Stokes numbers, these structures occupy a large part of the flow domain. For flow in a V-shaped junction, at a critical Stokes number, we observe a topological transition due to the merger of two anchors into one. From a stability analysis, we identify the parameter region of particle sizes and densities where capture due to anchors occurs.

Journal
Phys Rev Lett
Volume
121
Issue
5
Pages
054502
Date Published
2018 Aug 03
ISSN Number
1079-7114
Alternate Journal
Phys Rev Lett
PMID
30118271