The flow and mass transfer characteristics of CO₂ absorption in different liquid phases in a microchannel were studied by numerical simulation. The mixture gas phase contained 5 vol% CO₂ and 95 vol% N₂, and the different liquid phases were water, ethanol solution, 0.2 M monoethanolamine solution, and 0.2 M NaOH solution, respectively. Based on the permeation theory, the distribution of velocity and concentration in the slug flow was obtained by local simulation of flow and mass transfer coupling and was described in depth. The influence of contact time and bubble velocity on the mass transfer of the whole bubble was highlighted. The volumetric mass transfer coefficient on the bubble cap and liquid film, CO₂ absorption rate, and enhancement factor were calculated and analyzed. The results showed that the volumetric mass transfer coefficients of chemical absorption were ~3 to 10 times that of physical absorption and the CO₂ was absorbed more completely in chemical absorption. The new empirical correlations for predicting the mass transfer coefficient of the liquid phase were proposed respectively in physical absorption and chemical absorption, which were compared with the empirical formulas in the literature. The volumetric mass transfer coefficients obtained by predictive correlations are in good agreement with those obtained by simulation in this paper. This work made a basic prediction for CO₂ absorption in microchannel and provides a foundation for later experimental research.

中文翻译：

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微通道中不同溶液吸收CO2的传质过程的数值模拟

通过数值模拟研究了微通道中不同液相中CO ₂吸收的流动和传质特性。混合气相包含5体积％的CO ₂和95体积％的N ₂，并且不同的液相分别是水，乙醇溶液，0.2M单乙醇胺溶液和0.2M NaOH溶液。基于渗透理论，通过局部流动与传质耦合的模拟获得了团状流中速度和浓度的分布，并对其进行了深入描述。强调了接触时间和气泡速度对整个气泡传质的影响。气泡帽和液膜上的体积传质系数CO计算和分析₂吸收率和增强因子。结果表明，化学吸收的体积传质系数约为物理吸收的3到10倍， CO ₂在化学吸收中被更完全地吸收。分别在物理吸收和化学吸收中提出了预测液相传质系数的新的经验关系式，并与文献中的经验公式进行了比较。通过预测相关性获得的体积传质系数与通过仿真获得的体积传质系数非常吻合。这项工作对CO ₂做出了基本预测 在微通道中的吸收，为以后的实验研究奠定了基础。