Effect of surface properties on the flow characteristics and mass transfer performance in microchannels

Zhao, Yuchao; Su, Yuanhai; Chen, Guangwen; Yuan, Quan

doi:10.1016/j.ces.2009.10.027

Cited by 66 publications

(31 citation statements)

References 27 publications

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“…Up to now, plenty of studies on liquid–liquid slug flow in microchannels have yielded considerable insights, including formation process, film distribution, pressure drop, mass transfer and so on. At smaller scale (sub‐millimeter), the fluid behavior is mainly dominated by viscous force and surface tension.…”

Section: Introductionmentioning

confidence: 99%

Formation of liquid–liquid slug flow in a microfluidic T‐junction: Effects of fluid properties and leakage flow

Yao

Liu

et al. 2017

AIChE Journal

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Characteristics of liquid-liquid slug flow are investigated in a microchannel with focus on the leakage flow that bypasses droplets through channel gutters. The results show that the leakage flow rate varies in a range of 10.7-53.5% and 8.3-30.9% of the feed flow rate, during the droplet formation (i.e., at T-junction) and downstream flow (i.e., in the main channel), respectively, which highly depends on Ca number and wetting condition. Empirical correlations are proposed to predict them for perfectly and partially wetting conditions. Leakage flow contribution is further used to improve the Garstecki model for size scaling in order to extend its suitability for both squeezing and shearing regimes. The instantaneous flow rates of the immiscible phases are found to fluctuate periodically with the formation cycles, but in opposite behavior. The effect of the presence of leakage flow on such fluctuation are investigated and compared with gas-liquid systems.

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Section: Introductionmentioning

confidence: 99%

Formation of liquid–liquid slug flow in a microfluidic T‐junction: Effects of fluid properties and leakage flow

Yao

Liu

et al. 2017

AIChE Journal

Self Cite

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“…In recent years, gas-liquid flows in micro-and milli-channels have been the subject of an extensive literature (Garstecki et al, 2006;Dietrich et al, 2008;Pohorecki et al, 2008;Sobieszuk and Pohorecki, 2010;Zhao et al, 2010;Kashid et al, 2011;Roudet et al, 2011;Wang et al, 2013;Pan et al, 2014;Zhu et al, 2014;Kastens et al, 2015). Most of these works are devoted to the understanding and modeling of the hydrodynamics associated with the Taylor flows, as this kind of flow enables to achieve the best gas-liquid mass transfer rates required for implementing http://dx.doi.org/10.1016/j.ces.2016.01.013 gas-liquid reactions.…”

Section: Introductionmentioning

confidence: 99%

Visualization and characterization of gas–liquid mass transfer around a Taylor bubble right after the formation stage in microreactors

Yang

Dietrich

Loubière

et al. 2016

Chemical Engineering Science

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“…The organic phase holdup and the specific interfacial area can be defined as

φ_{org} = \frac{V_{org}}{V_{mc}} = \frac{Q_{org}}{Q_{org} + Q_{aqu}} = \frac{1}{1 + q}

a = \frac{A_{int}}{V_{mc}}

…”

Section: Methodsmentioning

confidence: 99%

“…Mass‐transfer phenomenon in two‐phase MCs and MRs has been studied in the literature . Some researchers have investigated mass transfer in the liquid‐liquid slug flow using different sizes of capillaries .…”

Section: Introductionmentioning

confidence: 99%

The effect of the size of square microchannels on hydrodynamics and mass transfer during liquid‐liquid slug flow

Sattari-Najafabadi

Esfahany

Wu³

et al. 2017

AIChE Journal

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The present study investigated the influence of square microchannel (MC) size on hydrodynamics and mass transfer in the liquid‐liquid slug flow regime. Three square MCs with the hydraulic diameters of 200, 400, and 600 μm were used. The employed method for estimating mass‐transfer coefficients remarkably increased the accuracy of the results. The findings revealed that decreasing the MC size improved the interfacial area due to plug length enlargement and deteriorated mass‐transfer resistances because of augmented internal circulations, leading to the considerable enhancement of mass‐transfer coefficients. The increasing effect on the overall mass‐transfer coefficient became greater with flow velocity, showing that size effect on mass‐transfer resistances was more profound at higher flow velocities. The influence of size on the interfacial area was significantly greater than that on mass‐transfer resistances due to the significant increment of wall film length with the decrease in channel size. © 2017 American Institute of Chemical Engineers AIChE J, 2017

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Effect of surface properties on the flow characteristics and mass transfer performance in microchannels

Cited by 66 publications

References 27 publications

Formation of liquid–liquid slug flow in a microfluidic T‐junction: Effects of fluid properties and leakage flow

Formation of liquid–liquid slug flow in a microfluidic T‐junction: Effects of fluid properties and leakage flow

Visualization and characterization of gas–liquid mass transfer around a Taylor bubble right after the formation stage in microreactors

The effect of the size of square microchannels on hydrodynamics and mass transfer during liquid‐liquid slug flow

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