Micromixing simulation of novel large-double-blade impeller

Liu, Baoqing; Zhang, Yikun; Zheng, Yijun; Huang, Bolin; Chen, Xiaoge; Jin, Zhi Min

doi:10.1016/j.jtice.2016.06.029

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…The parallel test reactions have been applied to evaluate the mass transfer or mixing efficiency in various kinds of mixers. − In this work, a valid method proposed by Jasińska was employed to characterize the liquid–liquid two-phase mass transfer and mixing efficiency. This method is based on the following reaction system …”

Section: Experimental Methodsmentioning

confidence: 99%

Liquid–Liquid Dispersion and Selectivity of Chemical Reactions in the Inline Teethed High Shear Mixers

Guo

Zhao

et al. 2021

Ind. Eng. Chem. Res.

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The effects of various structural and operating parameters on liquid–liquid dispersion and selectivity of chemical reactions in inline single-row teethed high shear mixers (HSMs) were studied by a parallel competitive reaction system. The product distribution X S was applied to evaluate the mass transfer characteristics. The results show that X S decreases evidently at first in tandem with a slight increase as the rotor speed and flow rate rise. The results also indicate that the structural parameters of the rotors play a more important role in enhancing the mass transfer efficiency at higher rotor speed. Compared with adjusting other structural parameters, increasing the teeth number of the rotor can most significantly decrease both X S and Sauter mean drop size d 32. Computational fluid dynamics was applied to predict the flow and power characteristics. Furthermore, a dimensionless correlation for X S is established to provide references for the design and optimization of inline HSMs in liquid–liquid systems.

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Section: Experimental Methodsmentioning

confidence: 99%

Liquid–Liquid Dispersion and Selectivity of Chemical Reactions in the Inline Teethed High Shear Mixers

Guo

Zhao

et al. 2021

Ind. Eng. Chem. Res.

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“…Actually, the mixing process includes two levels of homogenization, i.e., macromixing and micromixing. 1 Macromixing is the process for fluid elements to break up and advect into a space of interest and corresponds to the reactor scale. 2 Micromixing refers to the viscous-convective deformation along with the molecular diffusion process.…”

Section: Introductionmentioning

confidence: 99%

“…Mixing operation driven by stirring is very common in process industries such as chemical, pharmaceutical, metallurgy, sewage treatment, and so on. Actually, the mixing process includes two levels of homogenization, i.e., macromixing and micromixing . Macromixing is the process for fluid elements to break up and advect into a space of interest and corresponds to the reactor scale .…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation and Estimating Correlation of Micromixing Performance of Coaxial Mixers

Liu

Sun

Jin

et al. 2019

Ind. Eng. Chem. Res.

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In view of the significance, complexity, and difficulty of micromixing in viscous system, coaxial mixers with wide adaptability to viscosity are first combined with micromixing. The effects of feeding position, rotation mode, and impeller type on the micromixing performance of coaxial mixers are investigated numerically with the standard engulfment model and eddy dissipation concept model, and a dimensionless estimating correlation of segregation index X s is established based on the Buckingham π theorem. The results show that feeding near the discharge zone of the impeller favors the micromixing and Rushton turbine impeller (RT) is better qualified as the impeller near feeding point compared to six-straight-blade turbine impeller (SBT) and six-pitched (45°)-blade turbine impeller (PBT). At the same specific power consumption, the coaxial mixer has better micromixing performance with PBT + RT as inner impeller than with SBT + RT, and the difference of segregation index resulting from the rotation mode is small. Moreover, the proposed correlation is validated to be suitable for qualitative evaluation of micromixing performance of coaxial mixer consisting of inner impeller combining PBT and RT and outer anchor.

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“…For example, a coaxial mixer consists of an outer anchor and an inner Rushton turbine. It is suitable for high viscosity or pseudo-plastic mixing, and its large double-blade impeller can achieve a better micromixing performance [11]. Many studies have used CFD to predict the behavior of liquid-solid systems.…”

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confidence: 99%

A Study of Dispersed Phenomena on Rushton and Rushton V-CUT

Kunopagarnwong

Srinophakun

Manasthammakul³

2018

AJAS

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The flow behavior of liquid-solid particles in mixing tanks using a modified Rushton impeller, called a Rushton V-cut impeller, was studied. Both the Rushton and Rushton V-cut impellers were compared at a 300 rpm stirring speed and a 10 % wt solid concentration. Hydrodynamic behaviors, such as solid volume fraction, velocity, pressure, and shear stress, in both the Rushton and Rushton V-cut impellers were investigated. Computational fluid dynamics (CFD) software able to understanding of hydrodynamics of stirring liquids which contain solid particles. CFD programme was to predict the mixing flow of the highly viscous system. Therefore, the present work was carried out using CFD software with the Eulerian-Eulerian approach with a turbulent k-Îµ model. The simulation of mixing tanks was consisted of moving and stationary zones by using moving references frame method or MFR. The results were observed that Rushton V-cut can dramatically reduce pressure up to 20% and the shear stress up to 64.38% while keeping the liquid-solid mixing at a considerable degree. Therefore, this design can reduce the power consumption.

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Micromixing simulation of novel large-double-blade impeller

Cited by 6 publications

References 16 publications

Liquid–Liquid Dispersion and Selectivity of Chemical Reactions in the Inline Teethed High Shear Mixers

Liquid–Liquid Dispersion and Selectivity of Chemical Reactions in the Inline Teethed High Shear Mixers

Numerical Investigation and Estimating Correlation of Micromixing Performance of Coaxial Mixers

A Study of Dispersed Phenomena on Rushton and Rushton V-CUT

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