DEM-VOF simulations on the drawdown mechanisms of floating particles at free surface in turbulent stirred tanks

Kang, Qing; Yang, Chao; Wang, Jingtao

doi:10.1016/j.cej.2021.133275

Cited by 17 publications

(10 citation statements)

References 39 publications

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“…We have verified its accuracy in capturing the gas–liquid interface of particle-containing flows and simulating three-phase flows . Additionally, we have extended the method to solid–liquid suspension studies in stirred tanks and achieved good agreement with the experimental data. ,, …”

Section: Simulation Conditions and Verificationmentioning

confidence: 68%

“…27 Additionally, we have extended the method to solid−liquid suspension studies in stirred tanks and achieved good agreement with the experimental data. 28,29,31 In this work, the precision of the DEM−VOF model was assessed through comparison with Guida et al's experimental data. 60 The operating conditions and parameters of the tank matched the literature, using particles with a density of 2485 kg/m3 and a diameter of 3 mm, with a mass load of 5.2%.…”

Section: Simulation Conditions and Verificationmentioning

confidence: 99%

“…The CFD-DEM model is extensively used for simulating solid–liquid suspensions. − Sun et al developed a method coupling the volume of fluid (VOF) method with the discrete element model (DEM) based on CFD-DEM for simulating free-surface solid–liquid flow with complex wall boundaries . Our team previously developed the DEM–VOF method for turbulent free-surface solid–liquid flows in complex geometries and applied it to the study of stirred tanks. − …”

Section: Introductionmentioning

confidence: 99%

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Effects of Particle Suspension on Surface Vortex in Unbaffled Stirred Tanks through DEM–VOF

Jiao,

Zhang,

Gao

et al. 2024

Ind. Eng. Chem. Res.

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The interaction between the gas–liquid interface and suspended solid particles is an interesting scientific topic and could be studied effectively through the coupled method of discrete element method (DEM) and volume of fluid (VOF) since VOF could capture the evolution of the interface and DEM could describe the particle behaviors very well. In this work, the effects of the particle suspension on the surface vortex in unbaffled stirred tanks are investigated through DEM–VOF in order to reduce the surface vortex and sustain the stability while ensuring effective particle suspension, as the free-surface vortex leads to poor mixing and poor stability in unbaffled stirred tanks. The results show that suspended particles aid in diminishing the surface vortex scale by lessening the turbulence kinetic energy and the radial gradient of fluid velocity. In previous studies, the impeller clearance has almost no effects on the surface vortex in particle-free stirred tanks. However, when there are particles in the tank, it is disclosed in this study that the surface vortex reduces in size along with the decreasing impeller clearance.

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Section: Simulation Conditions and Verificationmentioning

confidence: 68%

Section: Simulation Conditions and Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Particle Suspension on Surface Vortex in Unbaffled Stirred Tanks through DEM–VOF

Jiao,

Zhang,

Gao

et al. 2024

Ind. Eng. Chem. Res.

Self Cite

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“…divided into 28 sections, the number of particles in each section was counted, and finally the relative standard deviation (σ), which represents the uniformity of the particle distribution, was calculated by eq 22. 32 According to the particle suspension criterion proposed by Bohnet and Niesmak, 45 the suspension is considered to be uniform when σ < 0.2. When σ is between 0.2 and 0.8, the suspension is considered to have reached a critical value for uniformity.…”

Section: Dem-vof Coupling Modelmentioning

confidence: 99%

Discrete Element Method–Volume of Fluid Simulation of Drawdown and Dispersion for Floating Particles in Stirred Tanks: Influences of Impeller Parameters

Li,

Zhang,

et al. 2024

Ind. Eng. Chem. Res.

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Exploring the drawdown and dispersion behaviors of particles in stirred tanks can provide insights and valuable references for optimizing the design of equipment and improving the efficiency of the stirring process. In this article, the kinetic behaviors of drawdown and dispersion of floating particles in the stirred tank were simulated by the DEM-VOF (discrete element method−volume of fluid) model. The influences of impeller parameters (blade number n, rotation speed w, eccentric distance l, and off-bottom clearance h) on the granular characteristics (particle distribution, coupling force, total force, and translational/rotational kinetic energies), fluid dynamics (fluid velocity and turbulent kinetic energy), and gas−liquid free surface were investigated. The results show that the drawdown process of floating particles can be divided into the pull-down stage, dispersion stage, and cycle stage. With the increase in n, w, l, or h, the duration of the pull-down stage decreases, while the duration of the cycle stage increases. Due to the vortex effect and turbulent motion in the stirred tank, both the particle characteristics and flow dynamics change with the impeller parameters. Besides, large n or w, small l, and moderate h result in the deeper gas−liquid free surface.

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“…The second mechanism is related to capillary phenomena which force the liquid to rise up through narrow capillaries between the particles. Kang et al [32] used discrete element model coupled with volume of fluid method (DEM-VOF) to simulate the entrainment of floating particles from the free surface into a turbulent flow in stirred vessels. The results revealed that the entrainment process can be divided into three stages, namely pull-down, dispersion and cycle stage, sequentially.…”

Section: Introductionmentioning

confidence: 99%

Free surface entrainment of oxide particles and their role in ultrasonic treatment performance of aluminum alloys

Sun

Higashi

Romankov

et al. 2022

Ultrasonics Sonochemistry

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DEM-VOF simulations on the drawdown mechanisms of floating particles at free surface in turbulent stirred tanks

Cited by 17 publications

References 39 publications

Effects of Particle Suspension on Surface Vortex in Unbaffled Stirred Tanks through DEM–VOF

Effects of Particle Suspension on Surface Vortex in Unbaffled Stirred Tanks through DEM–VOF

Discrete Element Method–Volume of Fluid Simulation of Drawdown and Dispersion for Floating Particles in Stirred Tanks: Influences of Impeller Parameters

Free surface entrainment of oxide particles and their role in ultrasonic treatment performance of aluminum alloys

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