Numerical simulation of hydrodynamics in an uncovered unbaffled stirred tank

Li, Liangchao; Xu, B.

doi:10.1007/s11696-017-0180-1

Cited by 9 publications

(2 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the unbaffled stirred tanks, the fluid movement is dominated by circular motion, and vortices will inevitably form at the gas–liquid interface, unlike the baffled stirred tank. Li et al , used the VOF method to simulate the free-surface flow in an unbaffled stirred tank. They analyzed the effects of various parameters, including impeller rotational speed, diameter, direction of rotation, blade angle, and impeller height, on the free-surface vortex and impeller power consumption.…”

Section: Introductionmentioning

confidence: 99%

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

Jiao,

Zhang,

Gao

et al. 2024

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

Jiao,

Zhang,

Gao

et al. 2024

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Numerically, one of the first CFD models for unbaffled systems was performed by [24]. Since then, an increasing number of researchers have used different CFD models to study the free surface [25][26][27][28], the effect of rotational speed and fluid [29][30][31], using different conventional 2-eq. turbulence models [32] and more advanced turbulence models such as RSM [33][34][35], DES [30], and LES [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Study of a Pharmaceutical Full-Scale Hydrogenation Reactor

et al. 2022

View full text Add to dashboard Cite

The pharmaceutical industry has been quite successful in developing new hydrogenation processes, and the chemistry of hydrogenation is currently well understood. However, it is a complex process to scale and optimize due to its high exothermicity, use of expensive catalysts and solvents, and its mass transfer requirements. Therefore, the aim of this work is to develop a CFD model to be able to describe the mass transfer, hydrodynamics, and mixing with respect to changes in rotational speed for a full-scale pharmaceutical hydrogenation reactor. In the first stage, a simple CFD model is used to predict the development of the surface vortex, and it is validated against literature data. In the second stage, the CFD model is tested on a full-scale configuration equipped with a Rushton turbine and a bottom kicker to study the formation of the surface vortex. Simulation results show the ability to predict the development of the surface vortex. These results are used to estimate the liquid height and mixing time as a function of several rotational speeds, allowing us to propose novel process correlations for this particular configuration. Although modelling the complete hydrogenation process would be challenging, this work is seen as a first step towards developing models that demonstrate the use of CFD at such large reactor scales.

show abstract

Numerical simulation of transient power consumption characteristics in an unbaffled stirred tank

Ke-feng

Xiang

2020

Chem. Pap.

View full text Add to dashboard Cite

Numerical simulation of hydrodynamics in an uncovered unbaffled stirred tank

Cited by 9 publications

References 33 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

Computational Fluid Dynamics Study of a Pharmaceutical Full-Scale Hydrogenation Reactor

Numerical simulation of transient power consumption characteristics in an unbaffled stirred tank

Contact Info

Product

Resources

About