A numerical investigation of the flow through an SMX+ mixer was undertaken in this study. Three elements were placed in series to assess various hydrodynamic parameters. Single-phase flows of different viscosities flowing at a hydraulic Reynolds number between 220 and 660 were considered to ensure turbulent conditions inside the mixer. The data was validated against pressure drop measurements collected under a wide range of hydrodynamic conditions.

The results show that a three-dimensional velocity field dominate the flow within the mixer where the distribution of the strain rate and vorticity magnitudes undergo large fluctuations. The extensional efficiency was found to increase substantially in the first part of each mixer, indicating good dispersive behavior; however, its value decreased to values below 0.5 downstream of the last element. This was due to the presence of a significant rotational core as the fluid flowed farther from the last mixer. The core region of the flow spiraled on its axis as it moved downstream while the near-wall area whirled orthogonal to the flow direction. This also explained the persistence of a flatter velocity profile downstream of the mixing section. The energy dissipation rate and kinetic energy were also analyzed.

本研究对通过 SMX+ 混合器的流量进行了数值研究。三个元件串联放置以评估各种流体动力学参数。考虑了以 220 到 660 之间的液压雷诺数流动的不同粘度的单相流，以确保混合器内的湍流条件。数据根据在各种流体动力学条件下收集的压降测量值进行了验证。

结果表明，三维速度场主导着混合器内的流动，其中应变率和涡量大小的分布经历了很大的波动。发现每个混合器的第一部分的拉伸效率显着增加，表明良好的分散行为；然而，它的值在最后一个元素的下游降低到低于 0.5 的值。这是因为当流体流离最后一个混合器更远时，存在明显的旋转核心。流动的核心区域在向下游移动时绕其轴旋转，而近壁区域则垂直于流动方向旋转。这也解释了混合段下游持续存在较平坦的速度分布。还分析了能量耗散率和动能。