Gas-liquid mass transfer and intensification in 3D-rhombus microchannel

doi:10.11949/0438-1157.20210929

Abstract

Abstract:

The effect of microchannels with three-dimensional interlaced diamond structures on the mass transfer enhancement of ionic liquid 1-butyl-3-methylimidazole tetrafluoroborate([Bmim][BF₄])aqueous solution of CO₂ absorption process was studied. The main flow regimes were slug flow and broken-slug flow in this study. The influences of the gas and liquid phase flow rates, the concentration of ionic liquid on the liquid side volumetric mass transfer coefficient k_La, enhancement factor E, CO₂ absorption efficiency X and pressure drop ΔP were studied. Experimental results showed that 3D-rhombus microchannel could significantly improve the volumetric mass transfer coefficient and the absorption efficiency in comparison with the straight channel, and the enhancement factor could reach 2.1, while the increment of pressure drop is only 0.9 kPa. A new dimensionless empirical correlation for predicting k_La was proposed with good predicting performance. The volume of fluid (VOF) method was utilized to simulate gas-liquid two-phase flow to obtain the velocity vector contour distribution of continuous phase. The vortexes could be induced by the 3D-rhombus microchannel to enhance the mass transfer.

Key words: microchannel, ionic liquid, mass transfer enhancement, carbon dioxide, gas-liquid two-phase flow

摘要：

研究了具有三维交错菱形结构的微通道对离子液体1-丁基-3-甲基咪唑四氟硼酸盐([Bmim][BF₄])水溶液吸收CO₂过程的传质增强作用。实验主要聚焦于弹状流和破碎弹状流。考察了弹状流型下气液流量、离子液体浓度对体积传质系数k_La、增强因子E、CO₂吸收率X及压力降ΔP的影响。结果表明，较之于直通道，三维菱形通道可以显著提高体积传质系数和CO₂吸收率，其增强因子可达2.1，压力降仅增加 0.9 kPa。提出了一个新的体积传质系数k_La预测式，预测效果良好。采用VOF法模拟了微通道内气液两相流动过程，获得了连续相的速度矢量场。三维菱形通道能诱导涡流，强化传质过程。

关键词: 微通道, 离子液体, 传质强化, 二氧化碳, 气液两相流

CLC Number:

TQ 021.4

Yiyu CHEN, Chunying ZHU, Taotao FU, Youguang MA. Gas-liquid mass transfer and intensification in 3D-rhombus microchannel[J]. CIESC Journal, 2022, 73(1): 175-183.

陈一宇, 朱春英, 付涛涛, 马友光. 三维菱形结构微通道内气液传质与强化[J]. 化工学报, 2022, 73(1): 175-183.

Figures/Tables 10

Fig.1 Schematic diagram of microchannel

Fig.2 Schematic diagram of experimental setup

Fig.3 Flow of gas-liquid two-phase in 3D-rhombic microchannel

Fig.4 Velocity vector diagram in the straight channel

Fig.5 Velocity vector diagram in the 3D-rhombus channel

Fig.6 Effects of [Bmim][BF4] concentration and gas and liquid flow rates on volumetric mass transfer coefficient kLa

Fig.7 Effects of [Bmim][BF4] concentration and gas and liquid flow rates on enhancement factor E

Fig.8 Effects of [Bmim][BF4] concentration and gas and liquid flow rates on CO2 absorption efficiency

Fig.9 Comparison between predicted values and experimental data of volumetric mass transfer coefficient

Fig.10 Effects of [Bmim][BF4] concentration and gas and liquid flow rates on pressure drop ΔP

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