title: Simulation of particle mixing in turbulent channel flow due to intrinsic fluid velocity fluctuation.
abstract: We combine a discrete-element-method simulation with a stochastic process to model the movement of spherical particles in a turbulent channel flow. With this model we investigate the mixing properties of two species of particles flowing through the channel. We find a linear increase of the mixing zone with the length of the pipe. Flows at different Reynolds number are studied. Below a critical Reynolds number at the Taylor microscale of around Rc ≈ 300 the mixing rate is strongly dependent on the Reynolds number. Above Rc the mixing rate stays nearly constant.
authors.affiliation: Computational Physics, IfB, ETH-Hönggerberg, Schafmattstrasse 6, CH-8093 Zürich, Switzerland. buthomas@ethz.ch
authors.forename: Thomas
authors.initials: T
authors.lastname: Burgener
authors.forename: Dirk
authors.initials: D
authors.lastname: Kadau
authors.forename: Hans J
authors.initials: HJ
authors.lastname: Herrmann