Gas–liquid bubble column reactors are often used in industry because of their favorable mass transfer characteristics. The bubble mass boundary layer in these systems is generally one order of magnitude thinner than the momentum boundary. To resolve it in simulations, a subgrid scale model will account for the sharp concentration variation in the vicinity of the interface. In this work, the subgrid scale model of Aboulhasanzadeh et al., Chem Eng Sci, 2012, 75:456–467 embedded in our in‐house front tracking framework, has been improved to prevent numerical mass transfer due to remeshing operations. Furthermore, two different approximations of the mass distribution in the boundary layer have been tested. The local and global predicted Sherwood number has been verified for mass transfer from bubbles in the creeping and potential flow regimes. In addition, the correct Sherwood number has been predicted for free rising bubbles at several Eötvös and Morton numbers with industrial relevant Schmidt numbers (10³–10⁵).

中文翻译：

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改进的子网格比例模型，用于基于前向跟踪的气泡传质模拟

气液鼓泡塔反应器由于其良好的传质特性而经常在工业中使用。这些系统中的气泡质量边界层通常比动量边界薄一个数量级。为了在仿真中解决该问题，子网格比例模型将说明界面附近浓度的急剧变化。在这项工作中，Aboulhasanzadeh等人的子网格规模模型（Chem Eng Sci，2012，75：456-467）已嵌入我们内部前跟踪框架中，已得到改进，以防止由于重新网格化操作而导致数值传质。此外，已经测试了边界层中质量分布的两种不同近似值。已经验证了局部和全局预测的Sherwood数是否可以在蠕变和潜在流动状态下从气泡传质。^{3 –} 10 ⁵）。