STW 14916 Particle Fluid Particle Interaction

Project: Research direct

Project Details


Magnetic density separation is a way to separate a stream of plastic waste into different types of plastic. To this end the plastic particles are inserted into a ferro-fluid which is exposed to a non-homogeneous magnetic field. The magnetic field makes the effective mass density of the fluid dependent on the height and every particle will move towards the height where its mass density equals the effective mass density of the fluid. For this process it is very important to keep the turbulence level of the fluid as small as possible, since turbulence induces mixing and this will counteract the separation. Turbulence is prevented by moving the horizontal walls of the system with the mean fluid velocity and by relaminarization of the flow by a honeycomb. However, velocity fluctuations of the fluid are also invoked by the motion of the particles and separation of the particles is hampered by particle collisions.In this project we study the separation efficiency of this method by performing point-particle direct numerical simulation of the flow with particles, including the effects of the particles on the flow and particle collisions. Initially, only spherical particles are considered, but in a later stage also ellipsoidal particles will be treated, since they resemble the real plastic particles more closely. Also the effects of the velocity fluctuations generated by the honeycomb will be taken into account. Results are compared with experimental results performed in the Department of Applied Physics.
People involved in this project: Hans Kuerten, Sina Tajfirooz & Lyon Hegh
Short titleSeparation of plastic waste
Effective start/end date1/10/161/05/21