Free‐Surface Turbulent Flow in an Eccentric Stirred Tank

Yang, Fengli; Zhou, Shenjie; Zhang, Cuixun

doi:10.1002/ceat.201600354

Cited by 5 publications

(5 citation statements)

References 49 publications

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“…This is different from the situation in the unbaffled concentrically stirred tank, whose free surface profile is generally symmetrical. The same trend can be confirmed in Yang et al’s work . As the eccentricity distance increases, the vortex size becomes smaller and the depth of the free surface is shallower.…”

Section: Results and Discussionsupporting

confidence: 80%

“…The same trend can be confirmed in Yang et al's work. 48 As the eccentricity distance increases, the vortex size becomes smaller and the depth of the free surface is shallower. 23a analyzes the evolution of particles in the stirred tank for different off-bottom clearances h. As indicated, the larger the h, the closer the impeller is to the free surface, which exacerbates the turbulent flow near the water surface, making it easier for the particles to be caught in the vortex.…”

Section: Effect Of Eccentric Distance 331 Particle Drawdown and Dispe...mentioning

confidence: 99%

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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: Results and Discussionsupporting

confidence: 80%

Section: Effect Of Eccentric Distance 331 Particle Drawdown and Dispe...mentioning

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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“…Its dimensions include a diameter of 0.032 m, a height of 0.3 m, and a thickness of 5 mm, resulting in a volume of 0.0241 m 3 . Figures (1,2) show the stirred tank used in the current study.…”

Section: Experimental Rig and Proceduresmentioning

confidence: 99%

“…To verify that the solution is independent of the grid utilized. To accomplish this, five grid resolutions were utilized, as given in Table (1). The velocity magnitude (in m/s) was computed against the number of cells, as shown in Figure (7), and the grid with (243,000) had the lowest amount of error (2.19%).…”

Section: Mesh and Grid Generationmentioning

confidence: 99%

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Study the effect of a new design of a twisted impeller blade on the vortexes formation and power consumption using a centric and eccentric stirred tank experimentally and numerically

Salho,

Hamzah

2024

Preprint

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Vortex formation in stirred tanks is one of the problems facing many stirred tank designers. The current study depicts experimentally and numerically the effect of changing the impeller structure and its location in a twisted shape on the shape of the vortex, energy consumption, flow patterns, and turbulent kinetic energy. Numerically, the finite volume method was used, the mathematical model used the Volume of Fluid to simulate the free surface between air and water, and the mathematical model (k- ε ) was used to simulate turbulent flow. Rotational speeds of the impeller of different values between (150-450 RPM) were applied, noting the effect of changing the location of the impeller experimentally and numerically on the flow parameters and other parameters. The current study showed that the rate of deviation in the values of torque and energy consumption between the numerical and practical studies is relatively acceptable in addition to the convergence in the shape of the vortex. The results obtained showed that the shape and location of the impeller affect the shape of the vortex, and changing the rotation speed affects the growth and depth of the vortex. The study also showed that the amount of torque for the un-baffled stirred tank is less than that for the eccentric stirred tank, depending on the rotation speed. For example, at the rotation speed (350RPM) it was (0.034 N.m) and at the same speed, it was (0.093 N.m) for the eccentric location. The study also showed a comparison of flow patterns between the central and eccentric locations of the impeller.

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Surface vortex formation and free surface deformation in an unbaffled vessel stirred by on-axis and eccentric impellers

Yamamoto

Fang

Komarov

2019

Chemical Engineering Journal

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Free‐Surface Turbulent Flow in an Eccentric Stirred Tank

Cited by 5 publications

References 49 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

Study the effect of a new design of a twisted impeller blade on the vortexes formation and power consumption using a centric and eccentric stirred tank experimentally and numerically

Surface vortex formation and free surface deformation in an unbaffled vessel stirred by on-axis and eccentric impellers

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