Abstract Recently, a new model for the reactive mass transfer during absorption of CO2 in aqueous NaOH was developed, based on using a rather generally applicable expression for the enhancement factor and taking into account the reaction of CO2 with water in addition to that with hydroxide ions (Kraus and Rzehak, 2017). By substituting the interfacial area concentration estimated from experimental data, good agreement was found for the pointwise measurement of time-dependent pH-value in a bubble column taken from the literature (Darmana et al., 2007). In the present contribution, this mass transfer model is implemented in an Euler-Euler/RANS framework including also the hydrodynamic part of the problem. Hydrodynamic closures were taken the same as applied successfully for a range of different conditions in previous work. However, the accuracy of the coupled model in predicting the measured pH-value is seen to fall behind that of the simple pointwise approximation. This suggests that for the present application, the hydrodynamic part of the model requires further improvement. Possible directions to this end are discussed.

中文翻译：

---

CO 2 在 NaOH 中的反应吸收：Euler-Euler 模拟研究

摘要 最近，基于对增强因子使用相当普遍适用的表达式，并考虑到除了与氢氧根离子的反应外，还考虑了 CO2 与水的反应，开发了一种用于在 NaOH 水溶液中吸收 CO2 过程中反应性传质的新模型。 （克劳斯和 Rzehak，2017 年）。通过替换根据实验数据估计的界面面积浓度，发现在取自文献（Darmana 等，2007）的气泡柱中逐点测量时间相关 pH 值具有良好的一致性。在目前的贡献中，该传质模型在 Euler-Euler/RANS 框架中实现，还包括问题的流体动力学部分。流体动力关闭与之前工作中成功应用于一系列不同条件的情况相同。然而，耦合模型在预测测量的 pH 值方面的准确性被认为落后于简单的逐点近似。这表明对于目前的应用，模型的流体动力学部分需要进一步改进。讨论了这方面的可能方向。