Hydrodynamics and Mass Transfer of Gas‐Liquid and Liquid‐Liquid Taylor Flow in Microchannels

Абиев, Р. Ш.; Svetlov, S. D.; Haase, Stefan

doi:10.1002/ceat.201700041

Cited by 48 publications

(31 citation statements)

References 100 publications

(214 reference statements)

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“…Microfluidic devices are very powerful tools for the development of intensified, efficient, resource saving, and environmental-friendly processes. The small length scales offer, among others, high surface-to-volume ratio, enhanced heat/mass rates, narrow drop size and residence time distributions, and safe operation [1,2]. In recent years, there have been increased efforts to translate studies from microfluidic devices into practical applications in many areas including, hydrometallurgy for efficient separation and enrichment of metal ions, biotechnology for 2 cell manipulation, analytical chemistry (μ-TAS systems) for DNA and protein purification, and pharmaceuticals for drug delivery [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Studies on mass transfer of europium(III) in micro-channels using a micro Laser Induced Fluorescence technique

Angeli

Tsaoulidis

Weheliye

2019

Chemical Engineering Journal

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The mass transfer of europium(III) from an aqueous to an organic phase was studied in a quartz microchannel (internal diameter of 200 μm) using a novel micro Laser Induced Fluorescence (micro-LIF) technique. Europium(III) was extracted from a 1M nitric acid solution into an organic solution of TBP(1.2M)/CMPO(0.2M) in Exxsol D80. For the flow rates investigated plug flow was established. An experimental and data processing methodology was developed to calculate concentration profiles from the fluorescing light intensity profiles in both phases at different locations along the microchannel. In particular, the effect that the high light intensity of the organic phase has on the measurements in the aqueous phase was taken into account. Mass transfer was found to be significant in the beginning of the channel close to the inlet (1 mm distance) with extraction percentages varying between 20 to 40% depending on the total flow rate. High extraction efficiency (~80%) was achieved at short residence times (in the first 6 s), while the overall volumetric mass transfer coefficients varied between 0.05 and 3.3 s-1 .

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Section: Introductionmentioning

confidence: 99%

Studies on mass transfer of europium(III) in micro-channels using a micro Laser Induced Fluorescence technique

Angeli

Tsaoulidis

Weheliye

2019

Chemical Engineering Journal

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“…The volumetric liquid phase mass transfer coefficients of CO 2 -dimethyl carbonate system were estimated from the measured rate combined approach of the online high-speed photography and the unit cell model was adopted by Yao et al (2014a), and the mass transfer was determined based on the absorption rate of CO 2 gas bubbles in water. However, there still remains a lack of understanding of the mechanism especially the dynamics details during the dissolution of gas bubbles and the evolution of k L a along microchannels (Abiev et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Dynamic changes in gas-liquid mass transfer during Taylor flow in long serpentine square microchannels

Zhang

Yao

et al. 2018

Chemical Engineering Science

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The present work focuses on the hydrodynamics variation and mass transfer characteristics of Taylor flow along long serpentine microchannels with a square cross-section. The volumetric mass transfer coefficient (k L a) is regarded as the transient change value to characterize the gas-liquid mass transfer process of CO 2 in water. All experimental data of Taylor bubble are obtained from 1,000 continuously captured images. An online high-speed imaging method and the unit cell model are adopted in this study. The effects of gas and liquid flow rates, together with microchannel geometry are investigated on Taylor bubble characteristics in terms of length, velocity and the mass transfer performance. Taylor bubble length shrinks and subsequently plateaus out along the flow direction from the T-junction, resulting in the decrease in Taylor bubble velocity. k L a in a unit cell gradually decreases along the serpentine microchannel, and increases as the channel cross-sectional area decreases. As the gas flow rate increases under a given liquid flow rate, a critical point is found for the evolution of k L a and k L

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“…For these reasons, gas-liquid reactions can be improved by employing flow conditions [13]. As a consequence, interfacial area mixing and flow of gas-liquid systems in confined spaces have been subject to extensive research by academia [14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Energy Optimization of Gas–Liquid Dispersion in Micronozzles Assisted by Design of Experiment

2017

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Abstract:In recent years gas-liquid flow in microchannels has drawn much attention in the research fields of analytics and applications, such as in oxidations or hydrogenations. Since surface forces are increasingly important on the small scale, bubble coalescence is detrimental and leads to Taylor bubble flow in microchannels with low surface-to-volume ratio. To overcome this limitation, we have investigated the gas-liquid flow through micronozzles and, specifically, the bubble breakup behind the nozzle. Two different regimes of bubble breakup are identified, laminar and turbulent. Turbulent bubble breakup is characterized by small daughter bubbles and narrow daughter bubble size distribution. Thus, high interfacial area is generated for increased mass and heat transfer. However, turbulent breakup mechanism is observed at high flow rates and increased pressure drops; hence, large energy input into the system is essential. In this work Design of Experiment assisted evaluation of turbulent bubbly flow redispersion is carried out to investigate the effect and significance of the nozzle's geometrical parameters regarding bubble breakup and pressure drop. Here, the hydraulic diameter and length of the nozzle show the largest impacts. Finally, factor optimization leads to an optimized nozzle geometry for bubble redispersion via a micronozzle regarding energy efficacy to attain a high interfacial area and surface-to-volume ratio with rather low energy input.

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Hydrodynamics and Mass Transfer of Gas‐Liquid and Liquid‐Liquid Taylor Flow in Microchannels

Cited by 48 publications

References 100 publications

Studies on mass transfer of europium(III) in micro-channels using a micro Laser Induced Fluorescence technique

Studies on mass transfer of europium(III) in micro-channels using a micro Laser Induced Fluorescence technique

Dynamic changes in gas-liquid mass transfer during Taylor flow in long serpentine square microchannels

Energy Optimization of Gas–Liquid Dispersion in Micronozzles Assisted by Design of Experiment

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