A novel passive micromixer with array of Koch fractal obstacles in microchannel

Shi, Xianchun; Wang, Long; Huang, Shaofu; Li, Feng

doi:10.1080/01932691.2019.1674156

Cited by 25 publications

(9 citation statements)

References 43 publications

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“…In numerical analysis, a high-quality mesh model is critical to the accuracy of the results [18]. The mesh independence test is very important to ensure that numerical data do not depend on grid size and shape [31]. Hence, structured tetrahedral cells were used for the numerical test as recommended by authors [32].…”

Section: = = δ (7)mentioning

confidence: 99%

Numerical Analysis of Mixing Performance of a Novel ‘Y-U’ Split and Recombine Micromixer

Mahmud¹

2021

JFFHMT

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This work presents a design of a new micromixer named 'Y-U' based on the split and recombine (SAR) principle. Five mixers are constructed varying a parameter, vertical cylindrical connector height H (Y-UH), starting from 0 mm to 0.8 mm. Numerical analysis is carried out at Reynolds numbers ranging from 1 to 50 using FLUENT 15 for the purpose of optimization. A well-known SAR mixer, namely 'H' is also studied in order to validate the numerical model. Proposed Y-U mixers offer better mixing performance than H mixer regardless of Reynolds numbers. The Y-U mixers show more than 90% efficiency at low Reynolds numbers ( ≤ 1) and efficiency is about 60% for Reynolds numbers from 10 to 50. Mixing efficiency depends on the vertical cylindrical connector height (H); efficiency and pressure drop increases with the increase of vertical cylindrical height. Y-U0.8 mm (H = 0.8 mm) shows better maximum efficiency compare to all examined mixers. In addition, the mixing cost is independent of vertical cylindrical height.

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Section: = = δ (7)mentioning

confidence: 99%

Numerical Analysis of Mixing Performance of a Novel ‘Y-U’ Split and Recombine Micromixer

Mahmud¹

2021

JFFHMT

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“…Although this work is the first simulation study examining chaotic mixing in integrated mix-and-inject devices, these types of effects in isolated micromixers have been reported on previously [17,[19][20][21][22]. For example, Jones et al [39] have carried out a parametric study of advection in order to investigate phenomena such as the stretching of interfaces and the chaotic stirring that occurs in micromixers incorporating twisted pipes.…”

Section: Introductionmentioning

confidence: 99%

“…The chaotic effect increases the effective contact surface area and overall contact time between the reactants, which results in an improved mixing efficiency compared to just a straight microchannel [9]. Examples of enhanced passive mixing strategies employed in micromixers include the use of intersecting channels [10][11][12][13][14][15], the addition of curvatures [16][17][18], and the inclusion of obstacles or barriers to the liquid flow [19][20][21][22][23]. For example, Solehati et al [24] conducted a numerical study comparing the mixing efficiencies of wavy and straight T-junction micromixers.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of Sub-Millisecond Integrated Mix-and-Inject Microfluidic Devices for Sample Delivery at Synchrotron and XFELs

2021

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Microfluidic devices which integrate both rapid mixing and liquid jetting for sample delivery are an emerging solution for studying molecular dynamics via X-ray diffraction. Here we use finite element modelling to investigate the efficiency and time-resolution achievable using microfluidic mixers within the parameter range required for producing stable liquid jets. Three-dimensional simulations, validated by experimental data, are used to determine the velocity and concentration distribution within these devices. The results show that by adopting a serpentine geometry, it is possible to induce chaotic mixing, which effectively reduces the time required to achieve a homogeneous mixture for sample delivery. Further, we investigate the effect of flow rate and the mixer microchannel size on the mixing efficiency and minimum time required for complete mixing of the two solutions whilst maintaining a stable jet. In general, we find that the smaller the cross-sectional area of the mixer microchannel, the shorter the time needed to achieve homogeneous mixing for a given flow rate. The results of these simulations will form the basis for optimised designs enabling the study of molecular dynamics occurring on millisecond timescales using integrated mix-and-inject microfluidic devices.

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“…Previous The effect of fractal-level roughness on the mixing of passive micromixers with low Re numbers has been studied (Wu and Chen 2019). The fractal theory has been applied in the field of micromixers such as fractal cantors (Shi et al 2021)…”

Section: Introductionmentioning

confidence: 99%

A Passive Micromixer with Koch Snowflakes Fractal Obstacle in Microchannel

2022

JAFM

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The passive micromixer is one of the essential devices that can be integrated into the Lab on Chip (LoC) system. Micromixer is needed to increase mixing efficiency. In this paper, two Koch fractal obstacle-based micromixer models of Secondary Snowflakes Fractal Micromixer (SSFM) and Tertiary Snowflakes Fractal Micromixer (TSFM) were designed. The effect of the Koch fractal resistance angles (15 o , 30 o , 45 o , 315 o , 330 o , 345 o ) and the influence of the inlet (T and T-vortex) were studied in this paper using COMSOL Multiphysics numerical simulations. The results showed that the TSFM structure with a 30 o angle on the T-vortex inlet is optimal. The deflection phenomena generated by the TSFM obstacle enhance the contact area between the two fluids and chaotic convection can be increased at Reynolds Number (Re) 0.05 and Re 100. This paper examines concentration curves along the channel ranging from 1 mol/L to 5 mol/L. This clearly shows that the fluid flow direction changes within the microchannel. This work provides a new design for the micromixer.

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A novel passive micromixer with array of Koch fractal obstacles in microchannel

Cited by 25 publications

References 43 publications

Numerical Analysis of Mixing Performance of a Novel ‘Y-U’ Split and Recombine Micromixer

Numerical Analysis of Mixing Performance of a Novel ‘Y-U’ Split and Recombine Micromixer

A Numerical Study of Sub-Millisecond Integrated Mix-and-Inject Microfluidic Devices for Sample Delivery at Synchrotron and XFELs

A Passive Micromixer with Koch Snowflakes Fractal Obstacle in Microchannel

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