Herein we present an investigation of the deposition of colloids onto granular and fibrous collectors by computational fluid dynamics (CFD) simulations . In particular the collision efficiency under unfavorable conditions, i.e., like-charged surfaces, was in focus. Particle trajectories were analyzed in a Lagrangian reference frame using a discrete phase model (DPM).
By user-defined functions (UDFs) we incorporated interception as important deposition mechanism and calculated interaction energies between particle and collector surfaces utilizing the extended Derjaguin‐Landau‐Verwey‐Overbeek (xDLVO) theory. Adhesive and hydrodynamic torques acting on deposited particles were compared through the developed UDFs to consider particle detachment. Within each DPM process, all abovementioned calculations on every particle are performed continuously, allowing to understand particle deposition under different physico-chemical conditions. Simulated data on collision efficiencies for the granular collector were in good agreement with theory and experiments. Simulations for the fibrous collector showed that...
Session: L15 - Depth Filtration and Adsorption - Modelling and Simulation
Day: 24 October 2019
Time: 10:45 - 12:00 h