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Mapping of collision regimes in flotation modelling
(2009)
  • Gijsbert Wierink
  • Juha Tiitinen
  • Kari Heiskanen
Abstract
The kinetics of bubble-particle collision are of particular interest in flotation modelling. Upon collision a mineral particle needs a critical amount of kinetic energy to overcome the energy barrier of bubble-particle attachment when sufficient sliding time is allowed. The nature of the bubble-particle collision is determined by relative velocity between bubble and particle, the turbulent contribution to velocity fluctuation, bubble and particle sizes, and particle density. However, collision kinetics characterization needs a description of a higher order momentum coupling due to the high void fraction of the dispersed phases in flotation systems. The momentum coupling can be obtained through the redistribution of the pressure field. The fluctuations in bubble pressure and surface tension during bubble-particle collision observed in experiments are used to quantify this momentum coupling. In this paper we explore a method to model the efficiency and rate of bubble-particle collisions in flotation systems by bubble pressure as a means momentum coupling. This method allows for quantitative mapping of bubble-particle collision regimes and can be used to further understand the physico-chemical behaviour of flotation systems.
Publication Date
December 11, 2009
Citation Information
Gijsbert Wierink, Juha Tiitinen, and Kari Heiskanen, "Mapping of collision regimes in flotation modelling". In: Proc. 7th Int Conf CFD in the Minerals and Process Industries, Melbourne, Australia, 9-11 December 2009.