Design and evaluation of two-dimensional passive micromixer based on unbalanced convergence-divergence-splits and reverse-collisions-recombination

Zou, Lili; Gong, Yao; Chen, Longsheng; Xiang, Yi; Liu, Wankun

doi:10.1016/j.ces.2021.116816

Cited by 23 publications

(9 citation statements)

References 32 publications

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“…In addition, because of the Coanda effect, more intense unbalanced feedback flow (i.e., a more unbalanced lateral driving force) could be produced due to the asymmetrical configuration of mixing units, which can induce more intense oscillating flow and thereby more efficient chaotic mixing. A similar phenomenon was found in the Tesla micromixer . Moreover, higher uniform mixing could be achieved with the advance of the stage level owing to the premixing and longer residence time, especially for S-OFM, where much higher homogeneous mixing is achieved in stage II than in stage I (Supporting Information, Figure S7d,h).…”

Section: Resultsmentioning

confidence: 99%

“…A similar phenomenon was found in the Tesla micromixer. 42 Moreover, higher uniform mixing could be achieved with the advance of the stage level owing to the premixing and longer residence time, especially for S-OFM, where much higher homogeneous mixing is achieved in stage II than in stage I (Supporting Information, Figure S7d,h). At Re = 531, both NS-OFM (Supporting Information, Figure S7e,g) and S-OFM (Supporting Information, Figure S7f,h) can achieve uniform mixing of species in stage II and much better homogeneous mixing in the later stages.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Mixing Characteristic and High-Throughput Synthesis of Cadmium Sulfide Nanoparticles with Cubic Hexagonal Phase Junctions in a Chaotic Millireactor

Wei

Yang

et al. 2022

Langmuir

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A four-stage oscillating feedback millireactor with splitters (S-OFM) was designed to improve the mixing performance based on chaotic advection. Three-dimensional CFD simulations were used to investigate its flow characteristics and mixing performance, and the generation mechanisms of secondary flows were examined. The results show that the mixing index (MI cup ) increased with the increase in the Reynolds number (Re), and MI cup could reach 99.8% at Re = 663. Poincarémapping and Kolmogorov entropy were adopted to characterize the chaotic advection intensity, which indicates that there is a intensity increase with the increase in Re. In addition, the results of Villermaux−Dushman experiments demonstrate that S-OFM performs excellently, and the mixing time could reach 1.04 ms at Re = 2764. Finally, S-OFM was successfully used to synthesize CdS nanoparticles with cubic hexagonal phase junctions. At a flow rate of 180 mL/min, the average particle size was 10.5 nm and the particle size distribution was narrow (with a coefficient of variation of 0.14).

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Mixing Characteristic and High-Throughput Synthesis of Cadmium Sulfide Nanoparticles with Cubic Hexagonal Phase Junctions in a Chaotic Millireactor

Wei

Yang

et al. 2022

Langmuir

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“…To reduce the interference of the experimental error by the backlight source, eq is used to normalize the converted grayscale image I ni = I i − I min I max − I min where I min and I max are the pixel color intensities of the deionized water and ink solution in the inlet channel obtained by grayscale image conversion, respectively.…”

Section: Physical Models and Experimental Proceduresmentioning

confidence: 99%

Multidirectional Vortex Micromixer Utilizing a Curved Channel with Variable Cross-Sectional Circular Arc Mixing Chambers

Xue,

Jin

2024

Ind. Eng. Chem. Res.

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A planar passive multidirectional vortex micromixer with a simple geometry and easy fabrication has been proposed and developed. The design of the microchannel structure integrates the flow impact, Dean flow, and vortex mixing effect by periodically arranging jet channels and variable cross-sectional circular arc mixing chambers. The complex vortex flow facilitates the breaking of the original laminar barrier of the fluid, which leads to efficient mixing by increasing the contact area of fluid mediums and reducing the diffusion distance of fluid molecules. The micromixer has been fabricated using precision micromilling technology, and the fluid mixing process was observed using a microscope imaging system. The fluid mixing process was simulated using commercial software, and the obtained numerical simulation results are consistent with the experimental results. At a flow Reynolds number of 70, the mixing index of the micromixer with a radius ratio of 2.66 is about 72% at the end of the first mixing module, and after completion of the flow of three mixing modules, the mixing index of its outlet channel cross section can reach more than 95%. This micromixer's simple and reliable performance makes it ideal for flexible applications in micro total analysis systems.

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“…41 By introducing complex structures within the channels, it is possible to overcome the limitations imposed by diffusion on mass transfer. 42,43 H. Amini et al 44 analyzed the complex ow patterns made by stream deformation about a series of single cylinders in a microuidic channel. Compared to other shapes, cylindrical bodies facilitate the recombination of uid aer splitting, thereby promoting transverse mass transfer.…”

Section: Introductionmentioning

confidence: 99%

Solute-particle separation in microfluidics enhanced by symmetrical convection

Yao,

Lin,

et al. 2024

RSC Adv.

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Design and evaluation of two-dimensional passive micromixer based on unbalanced convergence-divergence-splits and reverse-collisions-recombination

Cited by 23 publications

References 32 publications

Mixing Characteristic and High-Throughput Synthesis of Cadmium Sulfide Nanoparticles with Cubic Hexagonal Phase Junctions in a Chaotic Millireactor

Mixing Characteristic and High-Throughput Synthesis of Cadmium Sulfide Nanoparticles with Cubic Hexagonal Phase Junctions in a Chaotic Millireactor

Multidirectional Vortex Micromixer Utilizing a Curved Channel with Variable Cross-Sectional Circular Arc Mixing Chambers

Solute-particle separation in microfluidics enhanced by symmetrical convection

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