CFD simulation on influence of suspended solid particles on bubbles' coalescence rate in flotation cell

Sarhan, A.R.; Naser, Jamal; Brooks, Geoffrey

doi:10.1016/j.minpro.2015.11.014

Cited by 72 publications

(23 citation statements)

References 46 publications

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“…The change of mean bubble diameter in the riser (see Figure aii) with U g interprets the similar regularity. However, it is contrary to the cognition that higher U g accelerates the bubbles breakup rate, thus results in a smaller bubble size . The possible reason for this discrepancy is that, under present operating conditions, the JLR operates in pseudo‐homogeneous flow regime, where bubble coalescence is still dominant, which is in agreement with the observation by Besagni and Inzoli .…”

Section: Resultssupporting

confidence: 79%

Experimental investigation on multiscale hydrodynamics in a novel gas–Liquid–Solid three phase jet‐Loop reactor

Gao

et al. 2019

AIChE Journal

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Multiphase flow hydrodynamics in a novel gas–liquid–solid jet‐loop reactor (JLR) were experimentally investigated at the macroscales and mesoscales. The chord length distribution was measured by an optical fiber probe and transformed for bubble size distribution through the maximum entropy method. The impacts of key operating conditions (superficial gas and liquid velocity, solid loading) on hydrodynamics at different axial and radial locations were comprehensively investigated. JLR was found to have good solid suspension ability owing to the internal circulation of bubbles and liquid flow. The gas holdup, axial liquid velocity, and bubble velocity increase with gas velocity, while liquid velocity has little influence on them. Compared with the gas–liquid JLRs, solids decrease the gas holdup and liquid circulation, reduces the bubble velocity and delays the flow development due to the enhanced interaction between bubbles and particles (Stokes number >1). This work also provides a benchmark data for computational fluid dynamics (CFD) model validation. © 2019 American Institute of Chemical Engineers AIChE J, 65: e16537, 2019

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Section: Resultssupporting

confidence: 79%

Experimental investigation on multiscale hydrodynamics in a novel gas–Liquid–Solid three phase jet‐Loop reactor

Gao

et al. 2019

AIChE Journal

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“…The advances made in the modeling and simulations of the equipment were critically analyzed, and specific emphasis was given to the bubble-particle interactions and the effect of turbulence on these interactions. The simulation of flow behavior of flotation cells has been studied using multiphase E-E [38,39], mixture phase [40], and E-L [41,42] approaches. Mostly, the finite volume approach has been utilized in the reported studies, wherein local values of the flow properties are calculated by solving the governing continuity and momentum equation for each phase [37].…”

Section: Computational Fluid Dynamics (Cfd) In Multiphase Systemsmentioning

confidence: 99%

Trends in Modeling, Design, and Optimization of Multiphase Systems in Minerals Processing

2019

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Multiphase systems are important in minerals processing, and usually include solid–solid and solid–fluid systems, such as in wet grinding, flotation, dewatering, and magnetic separation, among several other unit operations. In this paper, the current trends in the process system engineering tasks of modeling, design, and optimization in multiphase systems, are analyzed. Different scales of size and time are included, and therefore, the analysis includes modeling at the molecular level (molecular dynamic modeling) and unit operation level (e.g., computational fluid dynamic, CFD), and the application of optimization for the design of a plant. New strategies for the modeling, design, and optimization of multiphase systems are also included, with a strong focus on the application of artificial intelligence (AI) and the combination of experimentation and modeling with response surface methodology (RSM). The integration of different modeling techniques such as CFD with discrete element simulation (DEM) and response surface methodology (RSM) with artificial neural networks (ANN) is included. The paper finishes with tools to study the uncertainty, both epistemic and stochastic, based on uncertainty and global sensitivity analyses, which is present in all mineral processing operations. It is shown that all of these areas are very active and can help in the understanding, operation, design, and optimization of mineral processing that involves multiphase systems. Future needs, such as meso-scale modeling, are highlighted.

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“…Sarhan et al [9][10][11] reported that the addition of hydrophobic particles can enhance bubble coalescence and reduce the gas holdup. In addition, the bubble concentration decreased with the addition of hydrophobic particles [12].…”

Section: Introductionmentioning

confidence: 99%

Population Balance Model Simulation of the Particle Effect on Flow Hydrodynamics in Slurry Beds

Shi

et al. 2019

Chem Eng & Technol

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Computational fluid dynamics (CFD) simulation can provide in‐depth knowledge on hydrodynamics in slurry‐bed reactors. The accuracy of CFD simulation is highly depending on the description of the interactions between gas phase and slurry phase with the drag model. Conventional drag models were usually developed for gas‐liquid systems without considering the presence of particles in slurry‐bed reactors. A modified drag model is proposed by taking into account the effect of particles. Simulation results proved the accuracy of the model in predicting hydrodynamics in the slurry bed. A higher particle concentration can increase the gas velocity and decrease the gas holdup due to the lower drag force between gas phase and slurry phase. The bubble size is predicted to be larger at higher particle concentrations due to the increased liquid eddy length scale. Considering the particle effect is critical for accurately simulating slurry‐bed reactors.

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CFD simulation on influence of suspended solid particles on bubbles' coalescence rate in flotation cell

Cited by 72 publications

References 46 publications

Experimental investigation on multiscale hydrodynamics in a novel gas–Liquid–Solid three phase jet‐Loop reactor

Experimental investigation on multiscale hydrodynamics in a novel gas–Liquid–Solid three phase jet‐Loop reactor

Trends in Modeling, Design, and Optimization of Multiphase Systems in Minerals Processing

Population Balance Model Simulation of the Particle Effect on Flow Hydrodynamics in Slurry Beds

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