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首页> 外文期刊>Chemical Engineering Science >Co-rotating twin-screw extruders: Detailed analysis of conveying elements based on smoothed particle hydrodynamics. Part 2: Mixing
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Co-rotating twin-screw extruders: Detailed analysis of conveying elements based on smoothed particle hydrodynamics. Part 2: Mixing

机译：同向双螺杆挤出机：基于平滑粒子流体动力学的输送元件详细分析。第2部分：混合

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摘要

A novel approach for the simulation of the flow in co-rotating twin-screw extruders based on smoothed particle hydrodynamics (SPH) was presented in Part 1. Specifically, we showed detailed results for the flow field in a completely filled conveying element, which are in excellent agreement with data from the literature obtained with computational fluid dynamics (CFD). Moreover, we studied the flow in the partially filled conveying element, facilitated by the inherent capabilities of SPH for modeling free-surface flows. In Part 2, we show a detailed analysis of the mixing effects based on the presented SPH simulations. We studied the mixing using tracer particles for the completely and partially filled states, evaluated the time evolution of the intensity of segregation and fitted kinetic laws in order to determine mixing rates. We conducted this separately for overall mixing and axial mixing and analyzed the contributions of axial and cross mixing to the overall mixing rates. We showed these results for various operation states and finally, presented a case study highlighting the effect of the residence time on mixing together with the determined mixing rates per screw revolution. This confirms that SPH is a very promising tool for the investigation of mixing in complex geometries in both, completely filled and partially filled states. The presented results provide an excellent basis for the further improvement of simplified models of entire extrusion processes, including a quantification of mixing. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在第1部分中，提出了一种基于平滑粒子流体动力学（SPH）的同向旋转双螺杆挤出机中流场模拟的新颖方法。具体而言，我们展示了完全填充的输送元件中流场的详细结果，即与通过计算流体动力学（CFD）获得的文献数据非常吻合。此外，在SPH建模自由表面流的固有功能的帮助下，我们研究了部分填充的输送元件中的流。在第2部分中，我们将基于提出的SPH模拟显示对混合效果的详细分析。我们研究了使用示踪剂颗粒对完全和部分填充状态进行的混合，评估了分离强度的时间演化并拟合了动力学定律，以确定混合速率。我们分别进行了整体混合和轴向混合，并分析了轴向混合和交叉混合对整体混合速率的贡献。我们展示了各种操作状态下的这些结果，最后提供了一个案例研究，重点介绍了停留时间对混合的影响以及确定的每转螺杆混合速率。这证实了SPH是研究完全填充和部分填充状态下复杂几何形状混合的非常有前途的工具。提出的结果为进一步改进整个挤出过程的简化模型（包括混合的量化）提供了极好的基础。 （C）2015 Elsevier Ltd.保留所有权利。

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