Gas–liquid microdispersion and microflow for carbon dioxide absorption and utilization: a review

Current Opinion in Chemical Engineering, Journal Year: 2023, Volume and Issue: 40, P. 100917 - 100917

Published: April 15, 2023

Language: Английский

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Efficient conversion of propane in a microchannel reactor at ambient conditions

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Jan. 29, 2024

Abstract The oxidative dehydrogenation of propane, primarily sourced from shale gas, holds promise in meeting the surging global demand for propylene. However, this process necessitates high operating temperatures, which amplifies safety concerns its application due to use mixed propane and oxygen. Moreover, these elevated temperatures may heighten risk overoxidation, leading carbon dioxide formation. Here we introduce a microchannel reaction system designed within an aqueous environment, enabling highly selective active propylene production at room temperature ambient pressure with mitigated risks. A selectivity over 92% rate 19.57 mmol m Cu −2 h −1 are simultaneously achieved. This exceptional performance stems situ creation active, oxygen-containing catalytic surface activation, enhanced transfer via enlarged gas-liquid interfacial area reduced diffusion path by establishing Taylor flow using custom-made T-junction microdevice. offers appealing approach accelerate gas-liquid-solid reactions limited solubility gaseous reactant.

Language: Английский

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A comprehensive study of droplet formation in a capillary embedded step T-junction: From squeezing to jetting

Chemical Engineering Journal, Journal Year: 2021, Volume and Issue: 427, P. 132067 - 132067

Published: Aug. 28, 2021

Language: Английский

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Taylor Bubble Generation Rules in Liquids with a Higher Viscosity in a T-Junction Microchannel

Industrial & Engineering Chemistry Research, Journal Year: 2022, Volume and Issue: 61(6), P. 2623 - 2632

Published: Feb. 4, 2022

Generation of bubbles in a T-junction microdevice is vital to microfluidic applications for its advantages easy fabrication and scaling-up, but the bubble generation liquids with higher viscosity rarely reported unstable dispersion behavior under constant flow rate-driven condition. Accordingly, this work investigates rules (45.6–240.5 mPa·s) constant-pressure method. It shows that formation process viscous contains three stages, expansion, shrinking, necking, which are obviously different from filling squeezing stages lower liquid. Importantly, satellite as new performance could be observed first time gas–liquid microdispersion process. The mechanism some novel phenomena revealed by interface evolution rules. Finally, mathematical model developed predict length.

Language: Английский

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Hydrodynamics of gas–liquid microfluidics: A review

Chemical Engineering Science, Journal Year: 2023, Volume and Issue: 285, P. 119563 - 119563

Published: Nov. 25, 2023

Language: Английский

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Microdispersion of Gas or Water in an Anthraquinone Working Solution for the H₂O₂ Synthesis Process Intensification

Industrial & Engineering Chemistry Research, Journal Year: 2023, Volume and Issue: 62(3), P. 1695 - 1705

Published: Jan. 17, 2023

The Reidl–Pfleiderer process intensification for H2O2 synthesis is urgently required. Microdispersion technique becoming one of the highest promising ways, but microdispersion rules gas or liquid in anthraquinone working solution have not been mentioned until now. This study employs an observation platform to investigate performances hydrogen, oxygen, water provide reliable data developing new microchemical processes. influence two-phase flow rate, viscosity, and channel size on bubble a circular microchannel was studied. A specific surface area higher than 20 000 m2/m3 obtained when 150 μm. unified mathematical prediction model gas–liquid liquid–liquid developed, it can be used future practical industrial system intensification.

Language: Английский

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Remarkable improvement of gas–liquid mass transfer by modifying the structure of conventional T‐junction microchannel

AIChE Journal, Journal Year: 2023, Volume and Issue: 69(7)

Published: April 7, 2023

Abstract Enhancing the mass transfer performance just by modifying channel structure without external energy input is one of most important topics for microchemical technology development. This work reports high‐performance gas–liquid in a novel step T‐junction microchannel. The liquid‐side coefficient has been significantly improved order magnitude when compared with conventional T‐junction, which higher up to 60 × 10 −4 m/s. To our knowledge, it might be highest value obtained microchannel input. parameters bubble generation frequency and interface movement velocity different microdevices are explored reveal mechanism behind ultra‐high T‐junction. Finally, two models considering gas absorption developed volume, proposed coefficient.

Language: Английский

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Surfactant effect on mass transfer characteristics in the generation and flow stages of gas–liquid Taylor flow in a microchannel

Separation and Purification Technology, Journal Year: 2023, Volume and Issue: 312, P. 123368 - 123368

Published: Feb. 8, 2023

Language: Английский

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Remarkable reduction of microbubble size by constructing a flexible interaction region in a T‐junction microchannel

AIChE Journal, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

Abstract High‐efficiency reduction of the microbubble size is important for bubble‐based microflow processes but has hitherto required high‐energy‐consumption methods. This study designed a new T‐junction microchannel with flexible interaction region exhibiting apparent superiority in producing smaller bubbles high energy‐utilization efficiency, and first time breaks limitation flow pattern ordinary microchannel. The results indicate that under given two‐phase working conditions, was greatly reduced compared to one. formation mechanism microdevice analyzed via simulated liquid velocity field. Importantly, bubbly appeared rapidly higher gas rate, which totally opposite expectations T‐junction. Finally, interface analysis, importance on viscous shearing force clarified, bubble size‐prediction model developed.

Language: Английский

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Controlling microbubble formation in microfluidic devices: Advancements in experimental, theoretical, and numerical strategies

Applied Physics Reviews, Journal Year: 2025, Volume and Issue: 12(2)

Published: April 7, 2025

Microfluidic devices are becoming increasingly popular for producing microbubbles, as these provide much greater control over microbubble size compared to traditional methods such sonication and amalgamation. Recent developments in microfabrication technologies have prompted several modifications conventional microfluidic devices, which allow one “engineer” microbubbles relevant specific biomedical applications. The pursuit of improvements engineering requires a detailed understanding fluid flow behavior systems, is where the motivation this work originates from. This provides an extensive review theoretical, experimental, numerical investigations reported literature understand formation using devices. evolution gas–liquid interfaces during formation, pinch-off mechanism, confinement effect on production rate been discussed. scaling laws prediction diameter regimes maps providing details about interplay different forces also reviewed. Furthermore, CFD simulations based interface tracking schemes along with recent strategies upscale We conclude by outlining need current systems produce can pave way new research field microfluidics engineering.

Language: Английский

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