Abstract Liquid holdup and mass transfer area are critical parameters for packed column design and CO2 capture efficiency prediction. In this paper, a framework was established for modeling the liquid–gas countercurrent flow hydrodynamics in a random packed column with pall rings. Besides the column-averaged information, the radial pall ring distribution, velocity, and liquid holdup profiles are obtained to study the entrance effect and the wall influence in the packed column. With local CFD data, the validated packing specific area ap and liquid velocity uL range for liquid holdup correlation is significantly expanded with respect to existing experimental or column-averaged CFD data. The proposed liquid holdup correlation h L ~ u L 0.44 indicates the random packed column falls in a viscous to turbulent transition regime and it covers a Reynolds Number range of [6.7–40.2]. The derived liquid holdup correlation is in good agreement with existing correlations developed using the column-averaged experimental data.

中文翻译：

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使用局部 CFD 数据研究随机填料塔中的逆流剖面和持液率

摘要 持液率和传质面积是填料塔设计和 CO2 捕集效率预测的关键参数。在本文中，建立了一个框架来模拟带有鲍尔环的随机填充柱中的液-气逆流流体动力学。除了塔平均信息外，还获得了径向鲍尔环分布、速度和持液率曲线，以研究填充塔中的入口效应和壁面影响。使用本地 CFD 数据，与现有的实验或柱平均 CFD 数据相比，经验证的填料比面积 ap 和液体流速 uL 范围内的液体滞留率得到了显着扩展。建议的持液率相关性 h L ~ u L 0。44 表示随机填充柱处于粘性到湍流的过渡状态，它涵盖了 [6.7-40.2] 的雷诺数范围。导出的液体滞留相关性与使用柱平均实验数据开发的现有相关性非常一致。