CFD simulation of single-phase flow in flotation cells: Effect of impeller blade shape, clearance, and Reynolds number

Basavarajappa, Manjunath; Mišković, Sanja

doi:10.1016/j.ijmst.2019.05.001

Cited by 24 publications

(8 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The PIV measurement results confirmed the CFD prediction results. Similar simulation results of single‐phase flow in the mechanical flotation cell have also been reported in other literature 16,80,81 . These CFD simulations of the single‐phase flow are focused on the stirring unit of the mechanically agitated flotation machine or the mechanical cell, ignoring the flow of the medium, especially for the bubbles.…”

Section: Computational Fluid Dynamics Numerical Simulation Of Flotation Devicesupporting

confidence: 80%

Recent advances in computational fluid dynamics simulation of flotation: a review

Wang

Yan

et al. 2021

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

Flotation process is a multi‐phase and multi‐scale complex flow system, in which hydrodynamics plays an indispensable role. In recent years, computational fluid dynamics (CFD) numerical simulation has gradually become a powerful tool for studying flotation. In this review, the theories of CFD numerical simulation in flotation research were reviewed, involving various turbulence models and multi‐phase flow simulation approaches. An attempt has been made to analyze and discuss the characteristics and applicability of different turbulence models and multi‐phase flow simulation approaches in flotation researches in detail. The CFD simulation of two commonly used flotation devices, that is, mechanically agitated flotation machine and flotation column, has been reviewed in detail. The detailed principles, operation, and hydrodynamic of flotation devices were discussed from the viewpoint of CFD. The advances made in CFD simulation for studying flotation process, including particle suspension, bubble dispersion, particle–bubble collision, attachment, and detachment subprocesses have been critically analyzed. Focused analysis was given on the influence mechanism of turbulence on the particle–bubble interactions. Finally, the gaps in the available literature are discussed and potential research directions are also proposed.

show abstract

Section: Computational Fluid Dynamics Numerical Simulation Of Flotation Devicesupporting

confidence: 80%

Recent advances in computational fluid dynamics simulation of flotation: a review

Wang

Yan

et al. 2021

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

show abstract

“…The rise in the velocity of bubbles was reduced because of the decrease in the bubble diameter, thus increasing the residence time of the bubbles and promoting the gas holdup in the flotation cell . It is noted that the turbulence intensity in the flotation cell is improved due to the shearing action of the stirring impeller, which is beneficial to disperse air into small bubbles and provided a better flow-field condition for bubble mineralization. , eqs and describe the relationship between the flotation efficiency with D 32 and bubble surface area flux ( S B ), in which the gas dispersion plays a role through both the mechanical process ( J G / D 32 ) and particle collection ( E C × E A ). The surface area flux is in reverse ratio to the bubble diameter.…”

Section: Resultsmentioning

confidence: 99%

“…12 It is noted that the turbulence intensity in the flotation cell is improved due to the shearing action of the stirring impeller, which is beneficial to disperse air into small bubbles and provided a better flow-field condition for bubble mineralization. 41,46 eqs 5 and 6 25 describe the relationship between the flotation efficiency with D 32 and bubble surface area flux (S B ), in which the gas dispersion plays a role through both the mechanical process (J G /D 32 ) and particle collection (E C × E A ).…”

mentioning

confidence: 99%

Gas Dispersion Characteristics in a Novel Jet-Stirring Coupling Flotation Device

et al. 2022

View full text Add to dashboard Cite

A jet-stirring coupling flotation device (JSCFD) was proposed to analyze the distribution characteristics of gas holdup and bubble Sauter mean diameter (D 32 ) in a gas−liquid system under various parameters. Results of studies suggested that the gas holdup increased with methyl isobutyl carbinol concentration, feeding pressure, and gas flow rate. The maximal gas holdup in the absence of the stirring impeller was ∼23.29% for the bubble size of 0.59 mm, which was considerably lower than the maximum gas holdup of 66.27% for the bubble size of 0.31 mm in the presence of the stirring impeller; the gas holdup was raised by ∼43% due to the bubbles torn by the stirring impeller to generate extensive smaller size bubbles and increase the content of small bubbles, and increasing the stirring impeller speed was conducive to reduce the bubble size and increase the gas holdup in JSCFD. Compared to traditional flotation machines, the size of bubbles generated by JSCFD was smaller, and the gas holdup distribution conforms to the following order: JSCFD > mechanical flotation machine > column flotation, which demonstrated that the JSCFD had a noticeable effect on increasing the gas holdup and reducing the bubble size.

show abstract

“…However, the function of single-shaft stirring is also relatively simple. The large linear velocity at the tip of the blade will also be generated during the stirring process, resulting in high shear, the formation of the tail vortex, and stable symmetrical flow fields such as the “isolation zone”, which reduces the chaotic mixing efficiency of the fluid. − …”

Section: Introductionmentioning

confidence: 99%

Chaotic Mixing Intensification and Flow Field Evolution Mechanism in a Stirred Reactor Using a Dual-Shaft Eccentric Impeller

Yao

Tang

Liu

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Nearly 95% of the energy in the stirred reactor maintains the symmetrical flow field structure formed by fluid rotation, which reduces the efficiency of fluid transfer. In this paper, a dual-shaft eccentric impeller based on the Rushton turbine (RT) and pitched blade Rushton turbine (PBRT) was proposed to eliminate the stable symmetrical flow field structure in the mixing tank and improve the fluid transfer efficiency and chaotic mixing degree. The effects of impeller types, the height difference between impellers, and shaft eccentricity on the single-phase flow field were researched. The power consumption, mixing time, chaotic characteristic parameter the largest Lyapunov exponents, flow field structure evolution, and fluid velocity of different dual-shaft eccentric impeller systems were also investigated through experiments and computational fluid dynamics simulation. Results showed that changing the impeller types and height difference on different shafts could improve the mixing efficiency at a lower power consumption incremental level. Meanwhile, both visual experiments and numerical simulation analysis demonstrate that the reasonable combination of the above two variables can make full use of the advantages of different impellers, strengthen the fluid transfer, destroy the symmetrical structure of the flow field in the stirred reactor, and enhance the energy dissipation of the system through the fluid transfer effect between blades and the coupling effect of height difference, which is conducive to improving the mixing efficiency of the system.

show abstract

CFD simulation of single-phase flow in flotation cells: Effect of impeller blade shape, clearance, and Reynolds number

Cited by 24 publications

References 33 publications

Recent advances in computational fluid dynamics simulation of flotation: a review

Recent advances in computational fluid dynamics simulation of flotation: a review

Gas Dispersion Characteristics in a Novel Jet-Stirring Coupling Flotation Device

Chaotic Mixing Intensification and Flow Field Evolution Mechanism in a Stirred Reactor Using a Dual-Shaft Eccentric Impeller

Contact Info

Product

Resources

About