Physics-based froth modelling: new developments and applications

ISSN： 1061-8562

Source： International Journal of Computational Fluid Dynamics, Vol.23, Iss.2, 2009-02, pp. : 147-153

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Abstract

This article describes the use of a flotation froth model based on foam physics. The model is briefly described by introducing the structure of froths and the equations that govern foam motion and liquid drainage. The methodology of combining the physical models for each phase into a complete description is reviewed. A boundary condition unique to froths, surface bursting, is detailed and its behaviour shown. The article does not dwell on the model itself, focussing instead on illustrating the utility of this physics-based froth modelling approach to optimising industrial flotation. This is illustrated with examples of improved understanding and operation. First, the liquid flow equations are solved explicitly, giving a clear interpretation of process variables and their importance on flotation behaviour. Second, an industrial example of the use of the model for improved air addition management is shown. This approach to froth modelling captures very closely the behaviour of flotation behaviour, and can be used for process optimisation. The most significant challenges that remain are discussed; most notably, understanding and incorporating the rates of bubble coalescence in the froth and bursting on the surface.