@article{oai:oist.repo.nii.ac.jp:00001494,
 author = {Shin, Sangwoo and Ault, Jesse T. and Toda-Peters, Kazumi and Shen, Amy Q.},
 issue = {2},
 journal = {Physical Review Fluids},
 month = {Feb},
 note = {Merging of different streams in channel junctions represents a common mixing process that occurs in systems ranging from soda fountains and bathtub faucets to chemical plants and microfluidic devices. Here, we report a spontaneous trapping of colloidal particles in a merging flow junction when the merging streams have a salinity contrast. We show that the particle trapping is a consequence of nonequilibrium interactions between the particles, solutes, channel, and the freestream flow. A delicate balance of transport processes results in a stable near-wall vortex that traps the particles. We use three-dimensional particle visualization and numerical simulations to provide a rigorous understanding of the observed phenomenon. Such a trapping mechanism is unique from the well-known inertial trapping enabled by vortex breakdown [Proc. Natl. Acad. Sci. USA 111, 4770 (2014)], or the solute-mediated trapping enabled by diffusiophoresis [Phys..Rev. X 7, 041038 (2017)], as the current trapping is facilitated by both the solute and the inertial effects, suggesting a new mechanism for particle trapping in flow networks.},
 title = {Particle trapping in merging flow junctions by fluid-solute-colloid-boundary interactions},
 volume = {5},
 year = {2020}
}