Isolated mixing regions and mixing enhancement in a high-viscosity laminar stirred tank

Kang, Qing; Liu, Jinfan; Yang, Chao; Wang, Jingtao

doi:10.1016/j.cjche.2021.11.008

Cited by 7 publications

(2 citation statements)

References 88 publications

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“…IMRs are coherent structures formed based on the free shear effect of the mixing layer 17 . These regions exhibit high fluid rotational velocity and low mass exchange rate, resulting in energy consumption and reduced mixing efficiency 18 . In fact, over 90% of the energy in STRs is consumed to maintain the symmetric flow field structure formed by fluid rotation.…”

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confidence: 99%

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Spatially Optimized Multi-Shafts Stirred Reactors: An Experimental Study on Spatiotemporal Instabilities

Meng,

Wang,

Yang

et al. 2023

Preprint

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Multi-shaft stirred reactors significantly impact the mixing efficiency and eliminate isolated mixed regions. Herein, the chaotic characteristics and spatiotemporal instability of flow fields were investigated in three different stirred reactor, and a novel flow field visualization technique was proposed to address limitations with low-viscosity fluids. Results demonstrated the chaotic behavior and energy transfer are inconsistent at various axial positions in the S-T-STR, D-T-STR, and T-T-STR flow fields, which are supported by pressure pulsation attractors, fractal dimension, largest Lyapunov exponents, multiscale entropy, and Kolmogorov entropy analysis. Torque signal attractor images confirmed stable periodic energy input to the flow field through the impeller. Hilbert spectrum analysis revealed time instability and periodic energy features after flow field stabilization. T-T-STR exhibited reduced spatial and temporal instability, denser periodic cycles, accelerated flow field structure evolution and energy transfer rate. These distinctions result from the distinctive flow field structure within each reactor configuration.

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confidence: 99%

“…As a result, more energy is required to overcome this flow field structure and create instability and chaos there in order to improve the mass transfer and mixing efficiency, especially in high viscosity industrial systems 18 .…”

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confidence: 99%