Multiphase flows and mixing in partially filled conveying elements of twin-screw extruders (TSEs) were simulated by using smoothed-particle hydrodynamics (SPH). A validation of SPH using experiment from the literature for a co-rotating twin-cam mixer indicated good agreement. A two-phase Poiseuille flow was also used to validate the accuracy of our approach. The results of two-phase flow in TSE show that the viscosity ratio significantly affects the flow and mixing of two-phase fluids. The symmetry of flow field is broken with different parameters. In the full filled case, the pressure squeezes particles into the gap, which is conducive to improve the performance of mixing of fluids. On the contrary, in the partially filled case, because there is no background pressure, particles tend to bypass the gap and flow to the cavity of the chamber. This work laid a foundation for further study of polymer blending by simulation.

中文翻译：

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利用SPH模拟同向双螺杆挤出机输送元件中的多相流动和混合

使用平滑颗粒流体动力学 (SPH) 模拟双螺杆挤出机 (TSE) 部分填充输送元件中的多相流动和混合。使用同向旋转双凸轮混合器文献中的实验对 SPH 进行验证，结果显示出良好的一致性。还使用两相泊肃叶流来验证我们方法的准确性。TSE中两相流的结果表明，粘度比显着影响两相流体的流动和混合。不同参数下流场对称性被破坏。在充满的情况下，压力将颗粒挤入间隙中，有利于提高流体的混合性能。相反，在部分填充的情况下，由于没有背景压力，颗粒倾向于绕过间隙并流向室的腔体。该工作为进一步通过模拟研究聚合物共混奠定了基础。