Aerated cavities behind the impeller blades in stirred tanks affect the power transferred to the liquid that in turns affects heat and mass transfer, thus the development of fully predictive simulation methods to detect the formation of cavities, their size and structures is of paramount importance for an effective simulation of aerated reactors and bioreactors. In this work, operating conditions corresponding to different cavity structures are investigated by means of a Reynolds averaged two-fluid model without adjustable parameters. Based on the comparison with previous experiments and correlations, the method proved to be reliable in the prediction of the transition between vortex-clinging and small '3-3′ cavities, cavity size and power drawn reduction. For the first time, small '3-3′ cavities with volume fractions close to unity are obtained with a steady approach. The power reduction mechanism is observed and a novel interpretation of the formation of the asymmetrical cavities is proposed.

搅拌罐中叶轮叶片后面的充气腔影响传递到液体的功率，进而影响热量和质量的传递，因此开发出完全预测性的仿真方法以检测腔的形成，腔的大小和结构对于搅拌器至关重要。充气反应器和生物反应器的有效模拟。在这项工作中，借助于没有可调参数的雷诺平均两流体模型研究了与不同型腔结构相对应的工作条件。在与之前的实验和相关性进行比较的基础上，该方法被证明是可靠的，它可以预测涡旋附着和小的“ 3-3”型腔之间的过渡，型腔尺寸和功率消耗降低。第一次，小“ 通过稳定的方法获得了体积分数接近于1的3-3'型腔。观察到功率减小的机理，并提出了对不对称空腔形成的新颖解释。