Intensification of mixing efficiency and reduction of pressure drop in a millimeter scale T-junction mixer optimized by an elliptical array hole structure

Zhao, Shufan; Hu, Runze; Nie, Yingying; Sheng, Lianzhu; He, Wei; Zhu, Ning; Guo, Kai

doi:10.1016/j.cep.2022.109034

Cited by 8 publications

(2 citation statements)

References 37 publications

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“…Most of the existing literature calculates porosity by reaching the ratio of the open hole area to the channel area, [25,26] without taking into account changes in thickness, Therefore, we have improved the method of calculating porosity, and the porosity ξ is calculated as follows:…”

Section: Geometry Modelmentioning

confidence: 99%

“…Most of the existing literature calculates porosity by reaching the ratio of the open hole area to the channel area, [ 25,26 ] without taking into account changes in thickness, Therefore, we have improved the method of calculating porosity, and the porosity ξ is calculated as follows:

ξ = \sqrt[3]{\frac{normalπ \times {(\frac{D}{2})}^{2} \times d - V_{x}}{normalπ \times {(\frac{D}{2})}^{2} \times d}}

where ξ is the porosity of the mesh baffle, D is the diameter of the small cylinder, d is the diameter of the mixed channel, and V x is the volume of the baffle. For complex structures, the volume of the baffle can be calculated using the software, and V x in this paper is calculated using ANSYS Geometry.…”

Section: Geometry Modelmentioning

confidence: 99%

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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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Section: Geometry Modelmentioning

confidence: 99%

“…Most of the existing literature calculates porosity by reaching the ratio of the open hole area to the channel area, [ 25,26 ] without taking into account changes in thickness, Therefore, we have improved the method of calculating porosity, and the porosity ξ is calculated as follows: