Mixing enhancement of a passive microfluidic mixer containing triangle baffles

Wang, Lei; Ma, Shenghua; Wang, Xuejing; Bi, Hongmei; Han, Xiaojun

doi:10.1002/apj.1837

Cited by 46 publications

(32 citation statements)

References 37 publications

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“…As the global trend is shifting towards microsystem technology development, this vital fluid-mixing process is also in search of mixing the fuel and oxidizer at the micro level. The design of MMs has been broadly examined with the aid of computational fluid dynamics (see previous studies [220][221][222][223][224][225][226][227]. The molecular diffusion process is also involved under certain standardized conditions, though such a mixing strategy is generally quite inefficient due to very low molecular diffusivities.…”

Section: Combustion Technologymentioning

confidence: 99%

Frontiers in combustion techniques and burner designs for emissions control and CO₂capture: A review

et al. 2019

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Summary The use of fossil fuel is expected to increase significantly by midcentury because of the large rise in the world energy demand despite the effective integration of renewable energies in the energy production sector. This increase, alongside with the development of stricter emission regulations, forced the manufacturers of combustion systems, especially gas turbines, to develop novel combustion techniques for the control of NOx and CO2 emissions, the latter being a greenhouse gas responsible for more than 60% to the global warming problem. The present review addresses different burner designs and combustion techniques for clean power production in gas turbines. Combustion and emission characteristics, flame instabilities, and solution techniques are presented, such as lean premixed air‐fuel (LPM) and premixed oxy‐fuel combustion techniques, and the combustor performance is compared for both cases. The fuel flexibility approach is also reviewed, as one of the combustion techniques for controlling emissions and reducing flame instabilities, focusing on the hydrogen‐enrichment and the integrated fuel‐flexible premixed oxy‐combustion approaches. State‐of‐the‐art burner designs for gas turbine combustion applications are reviewed in this study, including stagnation point reverse flow (SPRF) burner, dry low NOx (DLN) and dry low‐emission (DLE) burners, EnVironmental burners (including EV, AEV, and SEV burners), perforated plate (PP) burner, and micromixer (MM) burner. Special emphasis is made on the MM combustor technology, as one of the most recent advances in gas turbines for stable premixed flame operation with wide turndown and effective control of NOx emissions. Since the generation of pure oxygen is prerequisite to oxy‐combustion, oxygen‐separation membranes became of immense importance either for air separation for clean oxy‐combustion applications or for conversion/splitting of the effluent CO2 into useful chemical and energy products. The different carbon‐capture technologies, along with the most recent carbon‐utilization approaches towards CO2 emissions control, are also reviewed.

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Section: Combustion Technologymentioning

confidence: 99%

Frontiers in combustion techniques and burner designs for emissions control and CO₂capture: A review

et al. 2019

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“…Wang et al [19] carried out simulations and experimental investigations on a passive microfluidic mixer containing triangular baffles. Wang et al [19] carried out simulations and experimental investigations on a passive microfluidic mixer containing triangular baffles.…”

Section: Introductionmentioning

confidence: 99%

“…Using baffles and inserting obstacles in the channels is another common approach used previously by researchers in the context of passive mixing. Wang et al [19] carried out simulations and experimental investigations on a passive microfluidic mixer containing triangular baffles. They found that the mixing efficiency of their design was much better than that of a common Y-mixer over a wide range of Re from 0.1-500, and concluded that more groups of the triangular baffles and bigger apical angles lead to better mixing of the solutions.…”

Section: Introductionmentioning

confidence: 99%

Diffusion and convection mixing of non‐Newtonian liquids in an optimized micromixer

2018

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An optimized planar micromixer has been employed to study its performance in mixing liquids with various rheological behaviours. This design takes advantage of a number of passive techniques, including split-and-recombination of the channel, contraction of the channel, and embedding diamond-shaped obstacles in the main channels. Three-dimensional Navier-Stokes equations, along with an advection-diffusion model are solved by means of a finite-element scheme. Numerical simulations are performed for species with power law indexes ranging from 0.6-1.4, and the resulting mixing efficiencies are compared for different cases. Pressure drop is also evaluated and compared by taking into account the rheological behaviour of the fluids. The results revealed that in the studied range of Reynolds numbers, shear-thickening fluids present higher efficiencies in the diffusion-dominated regimes by 5 % at the best case. Shear-thinning flows have a better performance at higher Reynolds numbers and expedite the diffusion-advection transition point compared to other regimes. Transition occurs at a Reynolds number of 0.1 for the shear-thinning regime, while for Newtonian fluids this point is at a Reynolds number equal to 1. Moreover, it is found that the variation of mixing efficiency for shear-thickening flows with different fluid behaviour indexes is not significant in the studied Reynolds number range.

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“…The role of microfluidic systems is becoming more and more important during the past decades, especially in chemical synthesis and biological diagnosis . Micromixing is one of the most important decisive factors in most of the microfluidic reactions and diagnostic assays . Hence, novel channel designs need to be developed in order to gain excellent mixing effect.…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8][9] Micromixing is one of the most important decisive factors in most of the microfluidic reactions and diagnostic assays. [10,11] Hence, novel channel designs need to be developed in order to gain excellent mixing effect. There are mainly two broad types of mixers, i.e.…”

Section: Introductionmentioning

confidence: 99%

Micromixing enhancement in a novel passive mixer with symmetrical cylindrical grooves

Wang

Han

2015

Asia-Pacific J Chem Eng

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A passive micromixer with symmetrical cylindrical grooves along the channel was designed, fabricated and characterized. Systematic numerical simulations of mixing with Re ranging from 1.0 to 500 predict the optimized parameters and the mixing enhancement. The optimized depth of the cylindrical grooves is 100 µm. The experimental results have also confirmed the improvement of the mixing effect. Considering pressure drop and mixing enhancement, Re values of 10 and 100 are suitable for mixing of liquids with diffusion coefficients of 10−9 and 6 × 10−11 m2/s, respectively. The percentage of mixing of this micromixer is 2.22‐fold better than that of common Y‐mixer with Re of 10 at the distance of 19 mm from the meeting point of two fluids with the diffusion coefficient of 10−9 m2/s; similarly, the percentage of mixing of the new design is 2.18 times better than that of common Y‐mixer with Re of 100 at the distance of 19 mm from the meeting point of two fluids with the diffusion coefficient of 6 × 10−11 m2/s. This easy fabricated micromixer can be utilized for biological reactions and analytical assays. © 2015 Curtin University of Technology and John Wiley & Sons, Ltd.

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Mixing enhancement of a passive microfluidic mixer containing triangle baffles

Cited by 46 publications

References 37 publications

Frontiers in combustion techniques and burner designs for emissions control and CO₂capture: A review

Frontiers in combustion techniques and burner designs for emissions control and CO₂capture: A review

Diffusion and convection mixing of non‐Newtonian liquids in an optimized micromixer

Micromixing enhancement in a novel passive mixer with symmetrical cylindrical grooves

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Mixing enhancement of a passive microfluidic mixer containing triangle baffles

Cited by 46 publications

References 37 publications

Frontiers in combustion techniques and burner designs for emissions control and CO2capture: A review

Frontiers in combustion techniques and burner designs for emissions control and CO2capture: A review

Diffusion and convection mixing of non‐Newtonian liquids in an optimized micromixer

Micromixing enhancement in a novel passive mixer with symmetrical cylindrical grooves

Contact Info

Product

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Frontiers in combustion techniques and burner designs for emissions control and CO₂capture: A review

Frontiers in combustion techniques and burner designs for emissions control and CO₂capture: A review