CFD simulation of hydrodynamics and mixing performance in dual shaft eccentric mixers

Wang, Songsong; Xiong, Xia; Liu, Peiqiao; Zhang, Qiongzhi; Zhang, Qian; Tao, Changyuan; Wang, Yundong; Liu, Zuohua

doi:10.1016/j.cjche.2023.03.004

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…Additionally, as the distance between both sides of the symmetrical structure and branch pipe (5) increases, the drag coefficient tends to change slowly along with the increasing Reynolds number. Branch pipes (1) and ( 9), branch pipes ( 2) and ( 8), branch pipes (3) and ( 7), and branch pipes (4) and ( 9) are located on both sides of branch pipe (5) structure. With the symmetry of the structure, the variation trend of the resistance coefficient in each symmetrical branch pipe also presents symmetry.…”

Section: Pressure Loss Analysis Of Each Branch Pipe Of Airflowmentioning

confidence: 99%

“…The mixing of multiphase fluids and fluids with different densities is a common occurrence in various chemical production processes. [1][2][3][4][5][6][7][8][9][10][11][12] Mixers play a crucial role in facilitating fluid mixing across diverse fields such as biomedical diagnosis, food industry, chemical reactions, and environmental monitoring. [13][14][15][16] The quality of mixing performance, which represents the degree of mixing for multiphase and single-phase fluids with varying densities, holds significant importance in industrial production processes.…”

Section: Introductionmentioning

confidence: 99%

“…The mixing of multiphase fluids and fluids with different densities is a common occurrence in various chemical production processes 1–12 . Mixers play a crucial role in facilitating fluid mixing across diverse fields such as biomedical diagnosis, food industry, chemical reactions, and environmental monitoring 13–16 .…”

Section: Introductionmentioning

confidence: 99%

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Study on mixing characteristics of multichamber static mixer

Shi

Liu

2023

Engineering Reports

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This study presents a specialized mixer design for gas burners aimed at improving the efficiency of phase mixing while minimizing system resistance and energy consumption. The proposed design utilizes a multi‐cavity mixer employing both radial and axial mixing techniques, eliminating the need for additional power supply. Full premixed combustion of small gas‐fired industrial boiler has the function of “inhibiting” NOx emission from the source, and good mixing of fuel and combustion supporting air in the early stage is the primary prerequisite for realizing full premixed combustion denitration. In this article, a radial multichamber static mixer is designed following the characteristics of full premixed mixing in gas‐fired industrial boilers. The results demonstrate that the maximum pressure drop of the static mixer is 806 Pa; for gas and air branch pipes, the resistance coefficient f decreases rapidly with the increase in Reynolds number; when Re ≥ 1.2 × 103, the resistance coefficient in the air branch pipe decreases slowly; when Re ≥ 4.5 × 103, the resistance coefficient of gas branch pipe decreases slowly. Additionally, the maximum calculation error of symmetrical gas branch pipe is 9.1%. The static mixer's inlet exhibits a converted velocity of 24 m/s, and the outlet demonstrates an airflow velocity of 23.2 m/s. As a result, a kinetic energy loss of 6.5% is observed. The static mixing chamber makes the airflow rotate and causes different gases to shear and mix. The mixing channel has the function of correcting the airflow deviation, especially for the sudden expansion section. Generally, the two gases can be mixed evenly at the outlet of the mixer. The standard k‐e model and realizable k‐e model are employed to simulate the sudden expansion channel, and indicate that the standard k‐e has a wider range of influence. Further investigation is recommended to better comprehend and optimize this particular area of influence.

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Section: Pressure Loss Analysis Of Each Branch Pipe Of Airflowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on mixing characteristics of multichamber static mixer

Shi

Liu

2023

Engineering Reports

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Multi‐shaft stirred reactors mixing efficiency: Rapid characterization strategy based on chaotic attractors

Meng,

Yang,

Wang

et al. 2024

AIChE Journal

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The complex fluid dynamics mechanism of multi‐shaft stirring systems has constrained their application in industrial production. In this work, we have extracted torque signals to correlate power consumption with rotational speeds across single, dual, and triple shaft stirred reactors. Remarkably, the reasons behind the unique linear power consumption‐rotational speed relationship exhibited in triple‐shaft reactor, through the application of Fractional Fourier Transform. Our comparative analysis, through mixing energy, reveals multi‐shaft systems' superiority in energy‐efficient mixing. More importantly, the interaction between impellers and fluid within a reactor is reflected in the evolving of torque chaotic attractors. We have established a novel characterization strategy by fractal dimension of attractors which reflect the reactors' mixing efficiency. By mathematically modeling these attractors, we have demonstrated their potential as a tool for establishing the internal dynamics equations of stirred reactors. This approach offers a new method for evaluating mixing effectiveness and automated control of stirring machinery.

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