- Title
- Numerical estimation of critical local energy dissipation rate for particle detachment from a bubble-particle aggregate captured within a confined vortex
- Creator
- Hoque, Mohammad Mainul; Doroodchi, E.; Jameson, G. J.; Evans, G. M.; Mitra, Subhasish
- Relation
- ARC.DP180103971 http://purl.org/au-research/grants/arc/DP180103971
- Relation
- Minerals Engineering Vol. 180, Issue April 2022, no. 107508
- Publisher Link
- http://dx.doi.org/10.1016/j.mineng.2022.107508
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2022
- Description
- In flotation, interactions of bubble-particle aggregates with turbulent flow structures in the liquid medium result in particle detachment. This study aims to simulate this phenomenon involving a bubble-particle aggregate (bubble diameter ∼ 3 mm and particle diameter ∼ 314 µm) interacting with a turbulent flow structure manifested as a confined vortex in a square cavity connected to a square cross-section channel. An interface resolved three dimensional (3D) computational fluid dynamics (CFD) model was developed to quantify the bubble-vortex interaction dynamics over a range of channel Reynolds numbers. The CFD model produced a good agreement with the experimentally measured vorticity magnitude, local energy dissipation rate, and bubble motion. It was shown that a bubble-particle aggregate could be captured within the vortex by suitably varying the channel Reynolds number, eventually leading to particle detachment. A separate force balance analysis was performed to determine a criterion for particle detachment utilising the CFD model predicted vorticity and local energy dissipation rate. It was shown that a critical local energy dissipation rate ∼ 1.59 m2/s3 was required for particle detachment to occur, which was also verified experimentally.
- Subject
- bubble-particle interaction; turbulence; vortex; local energy dissipation rate; particle attachment/detachment; CFD modelling
- Identifier
- http://hdl.handle.net/1959.13/1483046
- Identifier
- uon:51070
- Identifier
- ISSN:0892-6875
- Language
- eng
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