- Title
- Analysis of dynamic interactions in a bubble-particle system in presence of an acoustic field
- Creator
- Yasmin, Dilruba; Mitra, Subhasish; Evans, Geoffrey
- Relation
- Minerals Engineering Vol. 131, p. 111-123
- Publisher Link
- http://dx.doi.org/10.1016/j.mineng.2018.11.008
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2019
- Description
- Use of an acoustic field in flotation is known to improve mineral recovery. However, studies in this area are rather limited and in general there is a lack of a mechanistic description of the collision and collection efficiency of particles in presence of an external acoustic field. This study aims to contribute to this knowledge gap by developing a simplified 3D numerical model of single bubble-particle interactions based on a discrete element method (DEM) based approach. Volume mode oscillatory behaviour of the bubble was modelled within the theoretical spherical shape limit (0.1 ≤ Bo ≤ 0.5) using 1D Rayleigh-Plesset equation in a quiescent liquid medium and one-way coupled to particle motion obtained through DEM. Interaction dynamics were simulated for various operating conditions involving three parameters, namely oscillation amplitude ratio (ε ≤ 0.1), excitation frequency (below and above resonance frequency) and bubble-particle surface-to-surface distance (~1.0 to 10.6% of bubble radius). Regime maps were constructed to establish suitable combinations of these three operating parameters to represent the collision and attachment behaviour of a particle with the oscillating bubble. While conventional flotation models predict particle collision efficiency based on the nearest streamline adjacent to the bubble surface, application of an acoustic field on a bubble was shown to incur collision with a particle in the far field away from the interface due to oscillatory motion. It was noted that although such collisions occurred in the below-resonance-frequency regime (~35 to 79Hz), particle attachment did not occur due to weakening of the attractive capillary force. In the above-resonance-frequency regime (3.61-14.4kHz), however, particle attachment was predicted and attachment probability increased in the vicinity of the bubble resonance frequency.
- Subject
- bubble-particle interaction; acoustic field; bubble oscillation; Rayleigh-Plesset model; DEM; collision; attachment
- Identifier
- http://hdl.handle.net/1959.13/1414626
- Identifier
- uon:36784
- Identifier
- ISSN:0892-6875
- Rights
- © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
- Language
- eng
- Full Text
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