Co-current air–water two-phase flow patterns in vertical triangular microchannels

Zhao, Tianshou; Bi, Qincheng

doi:10.1016/s0301-9322(00)00051-3

Cited by 233 publications

(122 citation statements)

References 12 publications

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“…As it can be seen from the figure, when superficial liquid velocity remains unchanged, with the increase of superficial gas velocity, G K a also increases. The mass transfer coefficient trend is basically the same with the phenomenon a number of researchers observed within the microchannel when the equivalent diameter is greater than 1mm [13][14][15] . It can also be seen from the figure that the increasing trend of G K a is gradually slowing down with the increase of superficial gas velocity.…”

Section: Experimental Principlesupporting

confidence: 80%

Study on Mass Transfer within the Microchannel Reactor

Li¹

2015

Proceedings of the 4th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering 2015

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Abstract. Taking CO 2 absorption as background, this paper makes a research on the experiments of CO 2 absorption of the NaOH solution within microchannel reactor. By changing the concentration, superficial gas velocity and superficial liquid velocity of NaOH solution, their impact on the CO 2 absorption rate is studied, and the results show that the overall mass transfer coefficient G K a increases when NaOH solution concentration increases. Under the same superficial liquid velocity, when superficial gas velocity increases, G K a also increases, and with the increase of superficial gas velocity, the increasing trend gradually slows down. At the same superficial gas velocity, with the increase of superficial liquid velocity, G K a also increase, and with the increase of superficial gas velocity, the increasing trend becomes faster. Experimental partThe experimental device is shown in figure 1, the ratio of N 2 and CO 2 gas flow is adjusted to 1: 1 by the mass flow meter, and the mixed gas gets into a microchannel of the microchannel reactor. The NaOH solution is withdrawn from advection pump at 30 ℃ super-heated water bath, then it flows into another microchannel of the microchannel reactor. Two-phase of liquid and gas contact in the main microchannel for the gas absorption process, and finally enter the gas-liquid separator for gas-liquid separation. The inner diameter of the microchannel reactor used in this experiment is 0.5mm. After the gas separation, the export flow is measured by the bubble flowmeter. Absorbing liquid titrates nitric acid solution to determine the amount of CO2 absorption. This experiment uses double indicator method, three consecutive parallel tests of each experiment are made to get the average.

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Section: Experimental Principlesupporting

confidence: 80%

Study on Mass Transfer within the Microchannel Reactor

Li¹

2015

Proceedings of the 4th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering 2015

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“…In addition, two-phase flow pattern maps in microchannel were similar with each other, although microchannels with different hydraulic diameters and different gas and liquid phases were applied [40,[44][45][46].…”

Section: Flow Pattern Analysismentioning

confidence: 93%

Process Characteristics of CO2 Absorption by Aqueous Monoethanolamine in a Microchannel Reactor

Chen

Yuan

2012

Chinese Journal of Chemical Engineering

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Process characteristics of CO 2 absorption using aqueous monoethanolamine (MEA) in a microchannel reactor were investigated experimentally in this work. A T-type rectangular microchannel with a hydraulic diameter of 408 μm was used. Operating parameters, i.e. temperature, pressure and molar ratio of MEA to CO 2 were studied. Under 3 MPa pressure, the mole fraction of CO 2 in gas phase could decrease from 32.3% to 300×10 −6 at least when gas hourly space velocity ranged from 14400 to 68600 h −1 and molar ratio of MEA to CO 2 was kept at 2.2. In particular, the effects of temperature on CO 2 absorption flux, mass transfer driving force, gas-liquid contact time and enhancement factor were analyzed in detail and found that mass transfer enhancement by chemical reaction was a crucial factor for the process of CO 2 absorption.

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“…will cause gas-liquid two-phase flow in microchannels to behave very differently from that in conventional large-sized tubes (>10 mm). For example, phenomena such as the disappearance of stratified flow regime, suppression of the bubbly flow existence region and flow characteristics independent of channel orientation will be expected for two-phase flow in microchannels [28][29][30][31][32].…”

Section: Two-phase Flow In Microchannelsmentioning

confidence: 99%