- Title
- Influence of grid-generated turbulence on detachment of a bubble anchored to a vertical cylindrical surface: application to mineral flotation systems
- Creator
- Wang, Guichao; Sathe, Mayur; Mitra, Subhasish; Joshi, J. B.; Jameson, Graeme J.; Evans, Geoffrey M.
- Relation
- Chemeca 2013 : Challenging Tomorrow. Proceedings of Chemeca 2013 : Challenging Tomorrow (Brisbane, Qld 29 September - 02 October, 2013)
- Relation
- http://www.conference.net.au/chemeca2013
- Publisher
- Engineers Australia
- Resource Type
- conference paper
- Date
- 2013
- Description
- Flotation recovery of coarse particles (typically more than 100 micrometers in diameter) is adversely influenced by the liquid motion resulting from energy input associated with mixing of the gas and solid phases. In particular, the collected particles can become detached from the bubble as the particle-bubble aggregate passes through regions of different turbulence levels within the flotation cell. The dynamics of the bubble-particle turbulence interaction is almost impossible to visualize within a real flotation system as the phases are in constant motion which changes with time and position. In this study, a stationary vertical (flat-ended) needle of size 1.24mm has been used to generate a bubble which is anchored to the top of the vertically oriented cylindrical surface. An oscillating grid device was then applied to generate a known turbulent field around the anchored bubble. The strength of the turbulence needed to detach bubble of different size was measured. Particle image velocimetry (PIV) combined with laser induced fluorescence (LIF) technique using fluorescent tracer particles was applied to quantify the instantaneous velocity field around the disturbed bubble. The detachment of the bubble was then modeled following the same approach as that used for particle-bubble flotation detachment. The detachment process reported in this study has allowed us to obtain detailed quantitative analysis of the instantaneous flow field and can be directly related to the dynamics occurring within flotation cells.
- Subject
- bubble detachment; oscillating turbulence; PIV/LIF
- Identifier
- http://hdl.handle.net/1959.13/1342283
- Identifier
- uon:28936
- Identifier
- ISBN:9781922107077
- Language
- eng
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