We present the detailed microscale modelling of flotation processes by means of Density Functional Hydrodynamics (DFH), which is the method developed by the authors during the last 20 years [1–5]. The DFH is the direct 3D numerical modelling method for compositional flow with gas, liquid and solid phases taking into account viscosity, compressibility, interfacial tension, gravity, diffusion, and a range of rheological models. Also, this method incorporates phenomena with phase transitions involving bulk and surface phases, such as degassing and adsorption.
The basic principles of the DFH are following: a) the Helmholtz energy or the entropy of the mixture is a functional depending on molar densities of the constituent chemical components, b) classical local conservation laws for components, momentum and energy are used as governing equations, c) constitutive relations and boundary conditions are consistent with the density functional.
We demonstrate 3D numerical simulations by DFH for three-phase mixtures comprising contact angles, wettability, rheological properties, and gravitational segregation. The proposed modelling is expected to help in fundamental understanding of processes in solid-liquid separation, mineral processing, and waste-water treatment.
Session: L15 - Flotation and Hybrid Processes for Water Treatment
Day: 15 March 2018
Time: 14:45 - 16:00 h