Mixing intensification through modifications of PBT impellers studied by DEM-VOF method

Li, Bao; Wang, Jingtao

doi:10.1016/j.cep.2022.109001

Cited by 8 publications

(2 citation statements)

References 44 publications

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“…Kang et al , investigated the effects of tank geometry, impeller rotation speed, particle density, diameter, and volume fraction on free-surface vortices, flow patterns, and particle suspension dynamics using the DEM-VOF method. Li et al , analyzed the effects of blade pitched angle and modified impeller (including making cutouts and adding fittings) on free interface evolution, particle suspension, and power consumption. E et al analyzed the effect of particle shape on multiphase fluid flow, velocity distribution, and turbulent kinetic energy based on three typical ellipsoidal particles.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…Nowadays, the crystallization, fermentation, and hydrometallurgical processes all often involve high solid concentrations (>0.2 v/v). Most research studies focus on dilute slurry conditions, − while the challenges of dense solid–liquid mixing have already attracted universal attention. − Power consumption is one of the important indicators for evaluating the performance of mixers, and Wu et al discovered that with growing amounts of solid content, the stirring power would increase exponentially. To reduce the just-suspended power at heavy solid concentrations, Wang et al and Wu et al recommend adopting mixers with a higher power number, and removing baffles from the stirred tank was also confirmed to be an effective way. , Additionally, several researchers established numerical models of dense solid–liquid mixing, − which all highlighted the significance of solid collisions on predicted values.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Synergistic Mechanism of Coaxial Mixers in Dense Solid–Liquid Mixing Systems

Wan

et al. 2023

Ind. Eng. Chem. Res.

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Coaxial mixers have broad application prospects owing to their special structure and operation mode, and the synergistic mechanism of coaxial slurry mixing systems was first investigated utilizing the computational fluid dynamics method. The results indicated that with the help of an outer anchor, the propeller in the up-pumping direction could more easily make solids suspend compared with that in the down-pumping direction. The increasing outer impeller speed had both positive and negative effects, and with the boundary of the inner impeller’s axial location, axial flows in stirred tanks were enhanced and inhibited, respectively. The tangential flows induced by the outer impeller could change the distribution of high axial velocity regions, whose moving path was opposite to the propeller’s pumping direction. According to the synergistic mechanism, a larger off-bottom clearance of the up-pumping propeller enabled promoting the quality of the solid suspension.

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Energy Conversion Characteristics of an In-Line Mixing Pump in Solid–Liquid Two-Phase Dynamic Mixing

Luo,

Cao,

Pei

et al. 2023

Arab J Sci Eng

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Mixing intensification through modifications of PBT impellers studied by DEM-VOF method

Cited by 8 publications

References 44 publications

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

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

Numerical Study on the Synergistic Mechanism of Coaxial Mixers in Dense Solid–Liquid Mixing Systems

Energy Conversion Characteristics of an In-Line Mixing Pump in Solid–Liquid Two-Phase Dynamic Mixing

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