Although mixing in stirred tanks is common in the chemical and process industry, it is complex and not fully understood. In recent years, computational fluid dynamics (CFD) simulations with large eddy simulation turbulence models have become an important modeling tool. In this study, its current state for applicability to stirred tanks was evaluated. First, the power characteristics of different impellers were simulated and compared with experimental data. Second, Rushton and pitched blade turbines were validated in terms of the local velocity components, dissipation rates, and the trailing vortex. Finally, mixing times for different viscosity ratios were obtained from the CFD results and compared with a literature study. Hydrodynamics can be well predicted. However, mixing times for viscosity ratios larger than 1:100 are error-prone.

中文翻译：

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使用格子玻尔兹曼 CFD 代码模拟搅拌釜反应器特性

尽管搅拌罐中的混合在化学和加工工业中很常见，但它很复杂且尚未完全理解。近年来，采用大涡模拟湍流模型的计算流体动力学（CFD）模拟已成为重要的建模工具。在本研究中，评估了其在搅拌罐中的适用性的现状。首先，对不同叶轮的功率特性进行了模拟，并与实验数据进行了比较。其次，对拉什顿涡轮机和倾斜叶片涡轮机的局部速度分量、耗散率和尾涡进行了验证。最后，从 CFD 结果中获得了不同粘度比的混合时间，并与文献研究进行了比较。可以很好地预测流体动力学。然而，粘度比大于 1:100 时的混合时间容易出错。