The waves of liquid film flow play an important role on the process intensification in spinning disk reactors (SDRs). However, the mechanism of wave formation was still unclear. In this work, a three‐dimensional large eddy simulation was developed to investigate the mechanism, as well as the characteristics of waves in the SDR. Agreed with the imaging results, different wave patterns were identified as: smooth film, concentric, and spiral waves in spreading direction; sine‐like and pulse‐like waves in fluctuating direction. The radial and tangential relative movements among the layers of liquid film were found to dominate the formation of different wave patterns. Local average film thickness (h_avg) and local wave amplitude (Δh) ranged from 0 to 500 μm and 0 to 200 μm, respectively. The waves can improve the turbulent intensity and enlarge the specific surface area, resulting in the intensification of transfer processes.

中文翻译：

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旋转盘式反应器中液膜流的波动特征的三维大涡模拟

液膜流动波对旋转盘式反应器（SDR）中的过程强化起着重要作用。但是，波形成的机理仍不清楚。在这项工作中，开发了三维大涡模拟，以研究SDR的机理以及波的特征。根据成像结果，确定了不同的波型：光滑的薄膜，同心圆和扩展方向上的螺旋波；以及 波动方向的正弦波和脉冲状波。发现在液膜层之间的径向和切向相对运动主导了不同波型的形成。局部平均膜厚（ħ_平均）和局部波振幅（Δ ħ）的范围分别为0至500μm和0至200μm。这些波可以改善湍流强度并扩大比表面积，从而导致传递过程的加剧。