Impellers with concave and vertically asymmetric blades proved superior gas dispersion capabilities and power consumption characteristics under gassed turbulent conditions with respect to traditional flat-blade turbines in aerated fermenters. In this study, a pilot-size gas–liquid tank stirred with an asymmetric blade disk impeller is numerically investigated by means of a Reynolds averaged two-fluid model combined with a simplified population balance model without adjustable parameters. This work aims at increasing the predictive capabilities of computational fluid dynamics multiphase modelling by validating a computational approach for the realistic simulation of industrial aerated fermenters and thus allowing for a more reliable scale-up. A methodology for achieving fully predictive results on fundamental variables for gas–liquid stirred tanks such as gassed power consumption, overall gas hold-up, and volumetric mass transfer coefficient, with affordable computational requirements at pilot and industrial scale is presented. Two-phase results are compared with the experimental data collected in a geometry matching the computational domain equipped with 3 planes of 16 sensors to enable electro-resistance tomography measurements and with suitable correlations from the literature. The limits and strength of the numerical procedure are discussed, starting from the comparison between computational predictions and experimental measurements.

中文翻译：

---

通过计算流体动力学方法验证气液搅拌罐数值模拟的程序

与充气发酵罐中的传统平叶片涡轮机相比，带有凹面和垂直不对称叶片的叶轮在气体湍流条件下证明了优越的气体分散能力和功耗特性。在这项研究中，通过雷诺平均二流体模型结合没有可调参数的简化总体平衡模型，对带有非对称叶片盘式叶轮搅拌的中试规模的气液罐进行了数值研究。这项工作旨在通过验证用于工业充气发酵罐的真实模拟的计算方法来提高计算流体动力学多相建模的预测能力，从而实现更可靠的放大。提出了一种在中试和工业规模具有可承受的计算要求的气液搅拌罐基本变量（例如充气功率消耗、总气体滞留率和体积传质系数）实现完全预测结果的方法。将两相结果与在与配备 16 个传感器的 3 个平面的计算域相匹配的几何结构中收集的实验数据进行比较，以实现电阻断层扫描测量，并与文献中的适当相关性进行比较。从计算预测和实验测量之间的比较开始，讨论了数值过程的限制和强度。提出了在试点和工业规模上具有负担得起的计算要求。将两相结果与在与配备 16 个传感器的 3 个平面的计算域相匹配的几何结构中收集的实验数据进行比较，以实现电阻断层扫描测量，并与文献中的适当相关性进行比较。从计算预测和实验测量之间的比较开始，讨论了数值过程的限制和强度。提出了在试点和工业规模上具有负担得起的计算要求。将两相结果与在与配备 16 个传感器的 3 个平面的计算域相匹配的几何结构中收集的实验数据进行比较，以实现电阻断层扫描测量，并与文献中的适当相关性进行比较。从计算预测和实验测量之间的比较开始，讨论了数值过程的限制和强度。