Design and optimization of a novel ellipsoidal baffle mixer with high mixing efficiency and low pressure drop

Zhao, Shufan; Sheng, Lianzhu; He, Wei; Zhu, Ning; Li, Yuguang; Ji, Dong; Guo, Kai

doi:10.1002/jctb.7179

Cited by 13 publications

(2 citation statements)

References 33 publications

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“…However, the mixers still have some problems, such as unstable mixing, a large energy loss, and the low and unadjustable ratio of pesticide and water. The structural optimization of injection mixers has also been extensively studied internationally, in which the mixing effect and energy loss of mixers can be improved by changing the geometry of the inner cavity of the mixer and the position, shape and number of guide plates [20][21][22][23][24]. Han et al [25] adopted numerical simulation and pilot scale test methods to optimize the structure of the static mixing device, to improve the mixing effect and save energy.…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Study of Ball-Head Cone-Tail Injection Mixer Based on Computational Fluid Dynamics

Shi

Xiang

et al. 2023

Agriculture

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The uniform and accurate mixing of pesticides in water is a necessary prerequisite for plant protection, especially for enabling precise variable spraying, and is also an important method to achieve a precise reduction in pesticide spraying. In order to ensure the uniform mixing of pesticides and water and solve the problems of traditional injection mixers, such as the limited range in the mixing ratio and unadjustable proportion, an active injection liquid mixer is designed in this paper. The mixer can be matched with an online mixing and spraying device to achieve accuracy in mixing and spraying. In this paper, a computational fluid dynamics (CFD) method is used to optimize the structure of the mixer. Through comparative analysis, the optimal structure of the mixer was found. It has a spherical head and conical tail, the number of guide plates is seven, and the shape is semicircular. By calculating the volume fraction of pesticide distribution under different cross-sections, the coefficient of variation in the process of mixing is obtained. The analysis shows that the maximum coefficient of variation of the ball-head cone-tail active injection mixer was 2.88% (lower than the allowable 5%) with a mixing ratio ranging from 300:1 to 3000:1. At the same time, image analysis methods of high-definition photography and ultraviolet spectrophotometry were used to analyze the mixing effect of the mixer. The test results show that, when the pressure of the pesticide injection is 1 MPa, the distribution of the pesticide and water in the ball-head cone-tail injection mixer is more uniform under different mixing ratios, and it has a better spatio-temporal distribution uniformity with the concentration changing a little at different times and different spatial locations. The mixer can provide a theoretical reference and technical support for the subsequent realization of an accurate online variable spray.

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Section: Introductionmentioning

confidence: 99%

Design and Experimental Study of Ball-Head Cone-Tail Injection Mixer Based on Computational Fluid Dynamics

Shi

Xiang

et al. 2023

Agriculture

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“…demand for industrial scale-up of continuous flow chemical processes has gradually increased. [7][8][9] However, it is difficult to achieve high mass and heat transfer efficiency and high throughput in a continuous flow reactor at the same time.…”

mentioning

confidence: 99%

Improvement of mass and heat transfer efficiency in a scale‐up microfluidic mixer designed by CFD simulation

Nie

Zhao

et al. 2023

Can J Chem Eng

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Due to scale effects, directly enlarging the size of the micromixer is an easy way to reduce the efficiency of mass and heat transfer in the continuous flow chemical process. It is urgently needed to solve the problem of mass and heat transfer efficiency of the scale‐up mixer. A scale‐up microfluidic mixer with a porous structure was designed to improve the mass and heat transfer efficiency using computational fluid dynamics (CFD) simulations. The effects of rotation angle, porosity, and baffle spacing were studied to optimize the mixer structure. Compared with the 1 mm mixer without structure, the scale‐up mixer has a higher mixing efficiency and an 80% reduction in energy consumption at Re ≥ 700. A Nusselt number was used to evaluate the heat transfer efficiency of the mixer during fluid heating. The results show that the porous baffle promotes the generation of secondary flow and enhances the heat transfer effect, making its Nu increase by three times compared with the unstructured mixer. The scale‐up microfluidic mixer with a porous structure can effectively improve the mass and heat transfer performance. This study can provide a reference for the design or development of a novel scale‐up mixer.

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Optimized design of macro‐microreactor for scale‐up of liquid–liquid chemical processes

Zhao,

Hu,

Wang

et al. 2024

AIChE Journal

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The scale‐up of microreactor‐based flow chemical process represents a grand challenge in chemical engineering. The small characteristic size (<1000 μm) of a typical microreactor leads to not only microscale effect (process intensification) but also low throughput. Here, we report macro‐microreactor to achieve scale‐up of liquid–liquid chemical operation with process intensification. By incorporating the designed internals based on computational fluid dynamics, the characteristic size of the macro‐microreactor is expanded into 3000–4000 μm. The optimized design of macro‐microreactor with helical‐shaped internal exhibits both similar or even stronger microscale effect and high throughput in contrast to the typical microreactor. For the liquid–liquid chemical process, seven times higher mass transfer coefficient and about half reduction of the pressure drop are realized. These macro‐microreactors would find further applications in industrial chemical manufacturing.

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Design and optimization of a novel ellipsoidal baffle mixer with high mixing efficiency and low pressure drop

Cited by 13 publications

References 33 publications

Design and Experimental Study of Ball-Head Cone-Tail Injection Mixer Based on Computational Fluid Dynamics

Design and Experimental Study of Ball-Head Cone-Tail Injection Mixer Based on Computational Fluid Dynamics

Improvement of mass and heat transfer efficiency in a scale‐up microfluidic mixer designed by CFD simulation

Optimized design of macro‐microreactor for scale‐up of liquid–liquid chemical processes

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