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

Liu, Baoqing; Gao, Pengfei; Xu, Zhe; Sundén, Bengt; Zheng, Yijun

doi:10.1021/acs.iecr.9b01867

Cited by 6 publications

(1 citation statement)

References 23 publications

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“…Actually, due to the wide adaptability and flexible operation, coaxial mixers are increasingly used in viscous system, especially in the cases with high and varying viscosity. Different from the single-shaft impeller, the coaxial mixer consists of inner and outer impellers driven by two independent motors and has four rotation modes, namely, single rotation of inner or outer impeller, co-rotation or counter-rotation of inner and outer impellers . In previous research works, the coaxial mixers exhibit excellent performances of power, macromixing, heat transfer, gas dispersion, and solid suspension in viscous systems. − Pakzad et al employed three coaxial mixers to investigate the effect of central impeller type, central impeller speed, and anchor impeller speed on the mixing time and the specific power consumption through ERT and CFD methods.…”

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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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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Experimental investigation on micromixing characteristics of coaxial mixers in viscous system

et al. 2020

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An experimental investigation into the micromixing performance of coaxial mixers in a viscous system is reported, in which the iodide‐iodate reaction system is chosen to quantitatively characterize the product distributions. The effects of feeding time, feeding position, impeller speed, inner impeller configuration, and operation mode on the segregation index, Xs, are examined. It is revealed that the feeding near the inner impeller benefits micromixing and should be regarded as the preferred position. The presence of the rotating outer impeller causes the micromixing performance of the coaxial mixer to be significantly better than the single‐shaft mixer. While an increase in the outer impeller speed has a limited influence on micromixing, the inner impeller speed is the dominant influencing factor, that is, the Xs decreases obviously when the inner impeller speed is increased. On the other hand, the coaxial mixers with multiple and axial inner impellers have a better micromixing performance at the same specific power consumption, PV, than that with single and radial inner impellers. Among the configurations consisting of a Rushton impeller (RT), six‐straight‐blade turbine impeller (SBT), and six‐pitched (45°)‐blade turbine impeller (PBT), the Xs of the coaxial mixer is always the smallest at the same PV when the PBT + RT configuration is used as the inner impeller. In addition, it is found that the difference in Xs that results from various operation modes is small in terms of power consumption; however, the co‐rotation mode is still recommended for the micromixing of the coaxial mixer due to its excellent performance in general.

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Experimental study on coaxial mixer based on critical uniform dispersion of floating particles

et al. 2021

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

Cited by 6 publications

References 23 publications

Numerical Investigation and Estimating Correlation of Micromixing Performance of Coaxial Mixers

Numerical Investigation and Estimating Correlation of Micromixing Performance of Coaxial Mixers

Experimental investigation on micromixing characteristics of coaxial mixers in viscous system

Experimental study on coaxial mixer based on critical uniform dispersion of floating particles

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