Micromixing performance and the modeling of a confined impinging jet reactor/high speed disperser

Nie, Ao; Gao, Zhengming; Lin, Xue Ping; Cai, Ziqi; Evans, Geoffrey M.; Eaglesham, Archie

doi:10.1016/j.ces.2018.03.032

Cited by 30 publications

(24 citation statements)

References 40 publications

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“…26,57 Typically, characteristic reaction times (inverse of k cat ) of 0.01 to 1 s are found for enzyme catalyzed reactions, and they are perfectly in the range of (micro) mixing times observed in stirred tank (batch) reactors. 58 Thus, under homogenous conditions (one-phase systems, but also a slurry system with fine particles) the apparent (observed) reaction rate is seriously limited, in fact controlled, by the intensity of mass transfer. Overall the substrates as well as the (immobilized) enzymes all move into the same general direction.…”

Section: Catalysis Science and Technologymentioning

confidence: 99%

Hydroxynitrile lyases covalently immobilized in continuous flow microreactors

Helm

Bracco

Busch

et al. 2019

Catal. Sci. Technol.

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Section: Catalysis Science and Technologymentioning

confidence: 99%

Hydroxynitrile lyases covalently immobilized in continuous flow microreactors

Helm

Bracco

Busch

et al. 2019

Catal. Sci. Technol.

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“…Various models such as the IEM (interaction exchange with the mean) model, engulfment model and incorporation model have been employed to characterize the micromixing performance based on the micromixing time t m , which is independent of the reaction system and operation conditions. The engulfment model can provide a more quantitative and appropriate characterization of micromixing compared with the IEM model . The incorporation model is simplified from the engulfment model and more suitable for high volume ratios .…”

Section: Resultsmentioning

confidence: 99%

“…Therefore a correlation between micromixing time and energy rate dissipation is proposed here. Based on previous works, the micromixing time is a function of the energy rate dissipation. Further, the relationship was developed as follows:

t_{m} = C {((), ν false/ \overset{ϵ}{true})}^{0.5}

where

\overset{true‾}{ϵ}

= P L / ρ L is the average energy dissipation rate, ν is the kinematic viscosity and C is a coefficient whose values are shown in Table .…”

Section: Resultsmentioning

confidence: 99%

“…The engulfment model can provide a more quantitative and appropriate characterization of micromixing compared with the IEM model. 33,34 The incorporation model is simplified from the engulfment model and more suitable for high volume ratios. 31 Therefore, in this study, the incorporation model was adopted owing to the high volume ratio (360) between solutions A and B.…”

Section: Micromixing Time In Rfsr Determination Of Micromixing Timementioning

confidence: 99%

“…Therefore a correlation between micromixing time and energy rate dissipation is proposed here. Based on previous works, 26,27,33 the micromixing time is a function of the energy rate dissipation. Further, the relationship was developed as follows:…”

Section: Relationship Between Micromixing Time and Energy Rate Dissipmentioning

confidence: 99%

See 2 more Smart Citations

Micromixing efficiency in a rotating foam stirrer reactor with various reactor configurations and liquid viscosities

Yang

Ouyang

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND The rotating foam stirrer reactor (RFSR) has shown its high mass transfer efficiency. Nevertheless, its micromixing efficiency, which is one of the significant parameters, still needs more comprehensive study for its better application and optimization. This work therefore employed the iodide–iodate reaction system to analyze the micromixing efficiency in an RFSR, and the effects of reactor configuration and liquid viscosity on micromixing efficiency were investigated. RESULTS The results show that high micromixing efficiency can be achieved when the feed location is at the outer edge of the rotor. Solid foam with low pores per linear inch (ppi) and equipping baffles on the reactor wall can also considerably improve the micromixing efficiency. The results further reveal that the micromixing efficiency decreased with increasing liquid viscosity. Micromixing times in an RFSR with various configurations, estimated based on the incorporation model, ranged from 2.1 × 10−4 to 2.0 × 10−2 s. The minimum value is smaller than that of many conventional reactors and is competitive with that of some novel reactors. In addition, a correlation to predict the micromixing time based on the average energy dissipation rate was developed, which agreed well with experimental values. CONCLUSION This study indicates that the RFSR has excellent micromixing efficiency and also provides fundamental information for optimization of the RFSR and its application in process industries. © 2019 Society of Chemical Industry

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Micromixing in a gas–liquid vortex reactor

et al. 2021

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The gas–liquid vortex reactor (GLVR) has substantial process intensification potential for multiphase processes. Essential in this respect is the micromixing efficiency, which is of great importance in fast reaction systems such as crystallization, polymerization, and synthesis of nanomaterials. By creating a vortex flow and taking advantage of the centrifugal force field, the liquid micromixing process can be intensified in the GLVR. Results show that introducing a liquid into a gas‐only vortex unit results in suppression of primary and secondary gas flow. The Villermaux–Dushman protocol is applied to study the effects of the gas flow rate, liquid flow rate, and liquid viscosity based on a segregation index. Based on the incorporation model and reaction kinetics, the micromixing time of the GLVR is determined to be in the range of 10−4 ~ 10−3 s, which is comparable to the highly efficient rotating packed bed and substantially better than a static mixer.

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Micromixing performance and the modeling of a confined impinging jet reactor/high speed disperser

Cited by 30 publications

References 40 publications

Hydroxynitrile lyases covalently immobilized in continuous flow microreactors

Hydroxynitrile lyases covalently immobilized in continuous flow microreactors

Micromixing efficiency in a rotating foam stirrer reactor with various reactor configurations and liquid viscosities

Micromixing in a gas–liquid vortex reactor

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