Modelling of flow and interaction dynamics in multi-phase dispersions
(S Miklavcic, B Hajek, J Aarao, D Ward)
Multi-phase dispersions are the norm in the industry process of flotation
used for water purification, de-inking of recycled paper pulp, and advanced
mineral recovery. Despite being a heavily utilized method, the basic
processes inherent to flotation are complex. Important fluid dynamic
features such as many-bubble hydrodynamic interactions, volume changes due
to finite bubble compressibility, and non-uniform distributions of
surface-active agents and their affects on particle capture are all present
in these compressible systems. In this project modelling the dynamics of a
stream of deformable and compressible bubbles as they rise through a
dispersion of particles is effected via numerical simulations of the dynamic
motion and interaction of deformable bubbles and solid particles as the
bubbles rise under buoyancy. Features such as coalescence, hydrodynamic
factors favouring and hindering particle capture and particle collection
efficiency are studied. Comparisons are made between full numerical results
and empirical or phenomenological theories as well as experiments conducted
by international collaborators.
Funding
Swedish National Research Council Grant, Modelling of flow and interaction dynamics in multi-phase dispersions, $192,000