Experimental study on the mixing and dispersing of floating particles in viscous system

Liu, Baoqing; Zheng, Yijun; Chen, Mingqiang; Huang, Bolin; Jin, Zhi Min

doi:10.1002/cjce.22581

Cited by 10 publications

(2 citation statements)

References 15 publications

(29 reference statements)

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“…It was mixed with the tangential flow near the center and generated the eccentric vortex. The position of the vortex observed in experiment (Liu et al, 2016), as shown in Figure 10, was basically the same where the largest intensity appeared in the simulation (Chen, 2015). 3The turbulence intensity near the surface in the vessel equipped with a Rushton turbine was larger than those in the vessels equipped with other impellers.…”

Section: Distribution Of Turbulence Intensitysupporting

confidence: 52%

CFD simulation of the mixing and dispersing of floating particles in a viscous system

Liu

Zheng

Chen

et al. 2017

Braz. J. Chem. Eng.

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Based on the Gidaspow model, the distributions of velocity, turbulence intensity, and solid concentration in stirred vessels equipped with a down-pumping propeller (TXL), a six flat-blade disc turbine (Rushton), or a downpumping six 45° pitched-blade turbine (PBTD-6) in a viscous system were simulated. The power curve of the TXL propeller and the dimensionless solid concentrations of one sampling point in the vessel at different agitation speeds were obtained by simulation and experiment, which were in good agreement with each other. The results showed that: (1) both the tangential velocity and turbulence intensity on the liquid surface caused by a Rushton turbine were the highest of the three conditions at the same agitation speed; (2) the turbulence intensity on the azimuth of 90° behind the baffle near the shaft on the liquid surface was relatively larger than that in other regions; (3) the uniformity of solid concentration distribution in the stirred vessel equipped with a Rushton or PBTD-6 turbine was better than that with a TXL impeller at the same agitation speed.

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Section: Distribution Of Turbulence Intensitysupporting

confidence: 52%

CFD simulation of the mixing and dispersing of floating particles in a viscous system

Liu

Zheng

Chen

et al. 2017

Braz. J. Chem. Eng.

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“…However, practical industrial mixing processes are mostly carried out in viscous systems, and the system viscosity may change during the mixing process, such as the tank coacervation reaction of butadiene rubber and the process system of recovering yellow phosphorus tail gas to produce formic acid, , in which the system viscosities are high and variable. Hence, it is necessary to study the drawdown and dispersion of floating particles in viscous systems and choose a novel mixer suitable for viscous systems. , …”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Drawdown of Floating Particles in Viscous Systems Driven by Coaxial Mixers

Liu

Gao

et al. 2019

Ind. Eng. Chem. Res.

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In view of the current situation of single form and low efficiency, a coaxial mixer with wide adaptability was combined with the drawdown of floating particles in viscous systems, and the effects of operation mode, impeller type, impeller diameter, impeller submergence, system viscosity, solid concentration and particle size were investigated experimentally. It is found that the coaxial mixer under corotation mode can achieve the critical drawdown of floating particles with lower speed and power than the corresponding single-shaft mixer, and the advantage becomes more obvious with increasing system viscosity and solid volume fraction. Under the same conditions, compared with the axial and radial flow impellers, the mixed flow impeller with down-pumping mode can effectively draw the floating particles down with the lowest critical speed and power. Moreover, a larger impeller diameter and smaller impeller submergence are recommended for the drawdown of floating particles, but the impeller diameter should not exceed half of the vessel diameter.

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Solid distribution and mixing time in stirred tanks: The case of floating particles

et al. 2017

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This work concerns floating particle distribution and liquid mixing dynamics in a solid‐liquid stirred tank. Measurements of local solids concentration distribution at steady‐state conditions and of liquid homogenization in the presence of dispersed particles at transient conditions are collected with up‐pumping and down‐pumping pitched blade turbines. Electrical resistance tomography is the selected experimental technique for the data acquisition in the opaque solid‐liquid mixture. For the time dependent conductivity data processing, the same method commonly applied to the mixing time determination from planar laser induced fluorescence measurements is considered. The method is successfully extended to the characterization of liquid mixing with floating particles. The local data obtained by the ERT technique over the whole vessel volume are fully exploited. The robustness of the method for tackling conductivity variations close to the liquid free surface and due to the particles movement is assessed.

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Experimental study on the mixing and dispersing of floating particles in viscous system

Cited by 10 publications

References 15 publications

CFD simulation of the mixing and dispersing of floating particles in a viscous system

CFD simulation of the mixing and dispersing of floating particles in a viscous system

Experimental Investigation on Drawdown of Floating Particles in Viscous Systems Driven by Coaxial Mixers

Solid distribution and mixing time in stirred tanks: The case of floating particles

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