This study aims to achieve an accurate prediction of the mass transfer characteristics of bubble columns under various conditions. First, numerous simulation cases are conducted to explore the appropriate numerical models and bubble sizes for accurately predicting gas holdup of air–water bubble columns operated with superficial gas velocity in the scope of 0.01 to 0.23 m/s. Second, suitable approaches are employed to evaluate the accuracy of some developed aspect ratio models and mass transfer models. Lastly, an improved model considering the residence time distribution is developed, and the effects of bubble shape and bubble swarm on mass transfer are deeply analyzed. This work provides a comprehensive insight into the mass transfer characteristics across different regions of gas–liquid bubble columns operated at various regimes, and offers references for precisely predicting gas–liquid mass transfer rates as well as designing and optimizing bubble columns.

中文翻译：

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气液气泡塔传质特性的数值模拟及改进的传质模型

本研究旨在实现各种条件下气泡塔传质特性的准确预测。首先，进行大量模拟案例来探索适当的数值模型和气泡尺寸，以准确预测表观气速在 0.01 至 0.23 m/s 范围内操作的空气-水气泡塔的含气率。其次，采用适当的方法来评估一些开发的长宽比模型和传质模型的准确性。最后，建立了考虑停留时间分布的改进模型，并深入分析了气泡形状和气泡群对传质的影响。该工作全面了解了不同工况下气液泡罩塔不同区域的传质特性，为精确预测气液传质速率以及泡罩塔的设计和优化提供了参考。