Hydrodynamic irreversibility of non-Brownian suspensions in highly confined duct flow
Metadatos
Mostrar el registro completo del ítemEditorial
Cambridge University Press
Materia
Suspensions Particle/fluid flow
Fecha
2023-09-11Referencia bibliográfica
Antolik, J., Howard, A., Vereda, F., Ionkin, N., Maxey, M., & Harris, D. (2023). Hydrodynamic irreversibility of non-Brownian suspensions in highly confined duct flow. Journal of Fluid Mechanics, 974, A11. [doi:10.1017/jfm.2023.793]
Patrocinador
US Department of Energy: FWP 80278, DE-AC05-76RL01830; University of Granada; MICINN PID2019-104883GB-I00 project (Spain)Resumen
The irreversible behaviour of a highly confined non-Brownian suspension of spherical
particles at low Reynolds number in a Newtonian fluid is studied experimentally and
numerically. In the experiment, the suspension is confined in a thin rectangular channel
that prevents complete particle overlap in the narrow dimension and is subjected to
an oscillatory pressure-driven flow. In the small cross-sectional dimension, particles
rapidly separate to the walls, whereas in the large dimension, features reminiscent of
shear-induced migration in bulk suspensions are recovered. Furthermore, as a consequence
of the channel geometry and the development and application of a single-camera particle
tracking method, three-dimensional particle trajectories are obtained that allow us to
directly associate relative particle proximity with the observed migration. Companion
simulations of a steadily flowing suspension highly confined between parallel plates are
conducted using the force coupling method, which also show rapid migration to the walls
as well as other salient features observed in the experiment. While we consider relatively
low volume fractions compared to most prior work in the area, we nevertheless observe
significant and rapid migration, which we attribute to the high degree of confinement.