A Novel Hybrid Scheme for Making Feasible Numerical Investigations of Industrial Three-Phase Flows with Aggregation

Ström, Henrik; Bondelind, Mia; Sasic, Srdjan

doi:10.1021/ie400886u

Cited by 8 publications

(2 citation statements)

References 28 publications

(40 reference statements)

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“…A model of such an industrial system must therefore be able to handle all the links in this chain in order to deduce any information about the performance of the equipment. A promising route to such simulations is via so-called hybrid schemes [39]. The method presented in the current work can be used for the derivation of hydrodynamic interaction forces between different configurations of bubbles and particles, as well as bubble-particle attachment probabilities as functions of locally varying parameters.…”

Section: Simulations Of Industrial Unitsmentioning

confidence: 99%

Detailed Simulations of the Effect of Particle Deformation and Particle-fluid Heat Transfer on Particle-particle Interactions in Liquids

Ström

Sasic

2015

Procedia Engineering

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A multiphase DNS (direct numerical simulation) method is used to investigate two types of particle-particle interactions relevant in dispersed liquid-solid flows: the interaction between two solid particles under non-isothermal conditions, and the interaction between a solid particle and a deforming particle (e.g. a bubble). It is shown that the drafting, kissing and tumbling sequence of two sedimenting solid particles can be significantly affected by the presence of simultaneous particle-fluid heat transfer. For small but finite internal particle heat sources, the drafting sequence is faster and the interaction is speeded up. However, for larger internal heat sources, the kissing and tumbling events may be inhibited altogether by the natural convection currents developing around the particles. In addition, isothermal interactions between a solid particle and a bubble are investigated. It is shown that the particle-bubble attachment process may be significantly altered under conditions of lowered surface tension (i.e. after addition of surfactants) due to an increased tendency for the bubble to deform.

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Section: Simulations Of Industrial Unitsmentioning

confidence: 99%

Detailed Simulations of the Effect of Particle Deformation and Particle-fluid Heat Transfer on Particle-particle Interactions in Liquids

Ström

Sasic

2015

Procedia Engineering

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“…Among different turbulence models, K‐ε has the highest application and provides more consistent results with experimental works (Bloom & Heindel, 2003; Deng et al, 2017; Kim et al, 2015; Lakghomi et al, 2015a, 2015b). Also, mathematical models have been used to simulate the particle size and forces acting on it together with the flow conditions in DAF (Bondelind et al, 2013; Dong‐Heui & Mi‐Sug, 2018; Ström et al, 2013). Shahbazi showed that micro‐turbulences have a more significant effect on particle flotation.…”

Section: Introductionmentioning

confidence: 99%

Particle removal optimization in rotating dissolved air flotation used in paper‐recycling wastewater treatment

Jelodar

Rad

Borghei

et al. 2021

Water & Environment J

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Rotating dissolved air flotation (RDAF) has been utilized for several decades in paper‐recycling wastewater treatment; however, it has rarely been addressed in the literature, which makes research into this system challenging and complicated. However, in this work, a full‐scale industrial wastewater treatment system for a paper‐recycling mill in Mazandaran province, Iran, was evaluated. Experiments indicated that under the same wastewater and chemical conditions, there are differences in the removal efficiencies. This finding was investigated by conducting simulation in ANSYS CFX R18.0 and experimentation simultaneously. Thus, the main purpose of this research was to optimize the operation to achieve the highest removal efficiencies in a cost‐effective manner. For simulation, the flow was considered as a two‐phase homogeneous flow with a continuous solid–fluid phase, which discharges into the separation zone at different scenarios. Particles with diameters of 250, 500 and 1000 μm were introduced at four frame rotating speeds of 0.125, 0.25, 0.5 and 0.75 rpm. Measured qualitative parameters of the effluent included COD, BOD, TSS, TDS, conductivity and turbidity, whose removal efficiency ranges were (32.2%–54.8%), (32.7%–54.47%), (94.5%–97.1%), (0.47%–0.55%), (0.48%–0.59%) and (more than 55%), respectively. Moreover, the optimum rotating speeds of the frame for particles with diameters of 250, 500 and 1000 μm were obtained as 0.25, 0.5 and 0.125 rpm, respectively; these values were compared and found to agree with the experimental results.

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Numerical investigation on mixing behaviour in the contact zone of an industrial‐scale dissolved air flotation tank

Chen,

Huang,

Hao

2024

Can J Chem Eng

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The mixing behaviour of the wastewater and the recycle bubbly water in the contact zone could affect the separation performance of dissolved air flotation systems. In this study, the mixing characteristics in the contact zone of an industrial‐scale dissolved air flotation tank were investigated using the computational fluid dynamics method. At first, the influence of the turbulence model on the simulation results was clarified. It is demonstrated that the realizable k‐ε model could predict the gas holdup distribution with better accuracy, and the maximum relative deviation between the predicted gas holdup and the experimental results is only 10%. The influence of the geometry and operating parameters on the mixing process was then studied numerically. It is found that the mixing performance in the contact zone could be improved by decreasing the height position of the nozzle inlet in a certain range. The reason is that microbubbles disperse better in the bottom region and a double circulation flow state forms in the contact zone when the nozzle inlet is installed at a low height. Additionally, the mixing process could be further enhanced by decreasing the diameter of the nozzle inlet. As to the operating conditions, increasing the recycle ratio could not only increase the gas holdup but also improve the mixing performance in the contact zone. When the recycle flow rate remains constant, increasing the wastewater flow rate will lead to a decrease in gas holdup and deterioration of the mixing effect.

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A Novel Hybrid Scheme for Making Feasible Numerical Investigations of Industrial Three-Phase Flows with Aggregation

Cited by 8 publications

References 28 publications

Detailed Simulations of the Effect of Particle Deformation and Particle-fluid Heat Transfer on Particle-particle Interactions in Liquids

Detailed Simulations of the Effect of Particle Deformation and Particle-fluid Heat Transfer on Particle-particle Interactions in Liquids

Particle removal optimization in rotating dissolved air flotation used in paper‐recycling wastewater treatment

Numerical investigation on mixing behaviour in the contact zone of an industrial‐scale dissolved air flotation tank

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