- Title
- Effects of turbulence on bubble-particle collision in flotation: A LeS-Lagrange approach
- Creator
- Wang, Ai; Hoque, Mohammad Mainul; Ge, Linhan; Evans, Geoffrey; Mitra, Subhasish
- Relation
- 29th International Mineral Processing Congress (IMPC 2018). Proceedings of the 29th International Mineral Processing Congress (IMPC 2018), Volume 5 (Moscow, Russia 17-21 September, 2018) p. 3418-3427
- Publisher
- International Agency of Congress Management (MAKO LLC)
- Resource Type
- conference paper
- Date
- 2019
- Description
- Dispersed phase interactions involving bubbles and particles in the turbulent environment play a significant role in the flotation process. The conventional collision models only account for the deterministic rather than the stochastic behavior of turbulenct flow. What the bubble-particle collisions would be like remains an open problem due to the complex nature of turbulent flow. To address this research question, the present study aims to quantify the bubble-particle collision efficiency incorporating turbulence using the computational method. Multiple solid particles were released to interact with a single stationary rigid bubble (non-deformable interface). Effect of particles Stokes number, turbulent intensity (TI) and integral length scale on the bubble-particle collision efficiency (P c ) was examined. Large Eddy Simulation method (LES) was used to compute the continuous phase. Fluctuating velocity required at the inlet boundary condition was derived from Gaussian energy spectrum to generate the upstream turbulence. Discrete Phase Model (DPM) is used to simulate particle trajectory. The characteristics of turbulent flow were analyzed through Energy spectrum and energy dissipation rate. The critical initial releasing radius of the annulus, where P c equals zero, reaches up to 1.5(R b +R p ) under high turbulent intensity (TI) 20.48% compared to 0.23(R b +R p ) calculated from the traditional P c model. Pc decreases as the distance of initial releasing annulus between bubble centre increases. P c increases as particle Stokes number increase up to 0.66. The collision efficiency for particles of St less than 0.38 is higher under TI 11.78% compared to TI 4%.
- Subject
- bubble; particle; collision; DPM; flotation; turbulence
- Identifier
- http://hdl.handle.net/1959.13/1459867
- Identifier
- uon:45801
- Identifier
- ISBN:9781510874992
- Language
- eng
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