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首页> 外文期刊>International Journal of Heat and Mass Transfer >Mass transfer characteristics for CO_2 absorption in nanoabsorbents
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Mass transfer characteristics for CO_2 absorption in nanoabsorbents

机译：纳米吸收剂吸收CO_2的传质特性

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摘要

In this work, an improved VOF-PLIC model is developed to simulate 3D bubble behavior and to analyze the mass transfer characteristics for CO2 absorption in pure methanol and methanol with Al2O3 nanoparticles. The lower bound boundary value of CO2 volume fraction(alpha(g)) is redefined according to the influence of a, on bubble shape and diameter as well as the interfacial area between gas and liquid. In addition, a reasonable drag force is added into the momentum equation using UDF code based on the assumption that the drag force only exists in liquid phase. It is found that the level lines of bubbles with the; value of 0.05 agree well with the real case, and the drag force has significant influence on the bubble behavior and mass transfer characteristics. The velocity contours and pressure gradients around the bubble are proposed to analyze the influence of drag force on the mass transfer characteristics. Also, the influence of the Al2O3 nanoparticles on the mass transfer enhancement is studied, and the results show that the dispersed particles can significantly enhance the mass transfer by increasing the gas-liquid interfacial surface renewal frequency. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在这项工作中，开发了改进的VOF-PLIC模型以模拟3D气泡行为并分析纯甲醇和含Al2O3纳米颗粒的甲醇中CO2吸收的传质特性。根据a对气泡形状和直径以及气体与液体之间的界面面积的影响，重新定义CO2体积分数的下界边界值（alpha（g））。另外，基于阻力仅存在于液相中的假设，使用UDF代码将合理的阻力添加到动量方程中。发现气泡的水平线与； 0.05的值与实际情况非常吻合，并且拖曳力对气泡行为和传质特性有重大影响。提出了气泡周围的速度轮廓和压力梯度，以分析阻力对传质特性的影响。此外，研究了Al2O3纳米颗粒对传质增强的影响，结果表明，分散的颗粒可通过增加气液界面更新频率显着增强传质。 （C）2018 Elsevier Ltd.保留所有权利。

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