Numerical and experimental investigation on a planar passive micromixer embedded with omega-shaped obstacles for rapid fluid mixing

Sun, Jiajia; Shi, Zongqian; Zhong, Mingjie; Ma, Yuxin; Chen, Shuang; Liu, Xiaofeng; Jia, Shenli

doi:10.1016/j.cep.2022.109203

Cited by 8 publications

(4 citation statements)

References 33 publications

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“…Passive micromixing is a popular type of micromixer that requires no external Although known to attain high mixing efficiencies and quality, active micromixers have their limitations. The biggest drawback of active micromixers is their energy consumption [61]. The external energy source needed to promote mixing prevents the microchannel reactor system from being energy efficient.…”

Section: Micromixer Type Main Findings/mixing Methods Of Fluid Flow Y...mentioning

confidence: 99%

Enhancing Biodiesel Production: A Review of Microchannel Reactor Technologies

Subramaniam,

Wong,

Wong

et al. 2024

Energies

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The depletion of fossil fuels, along with the environmental damages brought by their usage, calls for the development of a clean, sustainable and renewable source of energy. Biofuel, predominantly liquid biofuel such as biodiesel, is a promising alternative to fossil fuels, due to its compatible direct usage within the context of compression ignition engines. However, the industrial production of biodiesel is far from being energy and time efficient, which contributes to its high production cost. These inefficiencies are attributed to poor heat and mass transfer of the transesterification reaction. The utilisation of microchannel reactors is found to be excellent in escalating heat and mass transfer of the reactants, benefitting from their high surface area-to-volume ratio. The microchannel also intensifies the mixing of reactants via the reactor design, micromixers and the slug flow patterns within the reactor, thus enhancing the contact between reactants. Simulation studies have aided in the identification of mixing regimes within the microchannel reactors, induced by various reactor designs. In addition, microwave irradiation heating is found to enhance biodiesel production by localised superheating delivered directly to the reactants at a molecular level. This enables the reaction to begin much earlier, resulting in rapid biodiesel production. It is postulated that the synergy between microchannel reactors and microwave heating would catapult a pathway towards rapid and energy-efficient biodiesel production by enhancing heat and mass transfer between reactants.

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Section: Micromixer Type Main Findings/mixing Methods Of Fluid Flow Y...mentioning

confidence: 99%

Enhancing Biodiesel Production: A Review of Microchannel Reactor Technologies

Subramaniam,

Wong,

Wong

et al. 2024

Energies

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“…They concluded that this mixer achieves high mixing performance and lower pressure drop when compared to zigzag, square wave, and grooved serpentine micromixers. Sun et al (2022) investigated some micromixers by varying the geometry of the walls and the size of omega-shaped obstacles along the path, and thus proposed to intensify the mixing through the generation of vortices, the change of the flow direction and the split and recombination of streams. With Reynolds numbers ranging from 0.01 to 50, the minimum mixing index value was 78% with a maximum pressure drop of 61.5k at Re=50.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the mixing index in a micromixer of side feeds in a conical chamber

Neves,

Amaral,

Klein

et al. 2024

Chemical Engineering and Processing - Process Intensification

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“…Even though active micromixers offer the advantage of forcefully controlling flow, they also come with certain drawbacks, including higher consumption of energy, complex structure, and challenges in fabrication [ 2 , 5 ]. These limitations significantly impede active micromixers from being applied in microfluidic systems, particularly in the context of portability and cost-effectiveness [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Mixing Performance of a Passive Micromixer Based on Split-to-Circulate (STC) Flow Characteristics

Juraeva,

Kang

2024

Micromachines

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We propose a novel passive micromixer leveraging STC (split-to-circulate) flow characteristics and analyze its mixing performance comprehensively. Three distinct designs incorporating submerged circular walls were explored to achieve STC flow characteristics, facilitating flow along a convex surface and flow impingement on a concave surface. Across a broad Reynolds number range (0.1 to 80), the present micromixer substantially enhances mixing, with a degree of mixing (DOM) consistently exceeding 0.84. Particularly, the mixing enhancement is prominent within the low and intermediate range of Reynolds numbers (0.1<Re<20). This enhancement stems from key flow characteristics of STC: the formation of saddle points around convex walls and flow impingement on concave walls. Compared to other passive micromixers, the DOM of the present micromixer stands out as notably high over a broad range of Reynolds numbers (0.1≤Re≤80).

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Numerical and experimental investigation on a planar passive micromixer embedded with omega-shaped obstacles for rapid fluid mixing

Cited by 8 publications

References 33 publications

Enhancing Biodiesel Production: A Review of Microchannel Reactor Technologies

Enhancing Biodiesel Production: A Review of Microchannel Reactor Technologies

Evaluation of the mixing index in a micromixer of side feeds in a conical chamber

Mixing Performance of a Passive Micromixer Based on Split-to-Circulate (STC) Flow Characteristics

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