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首页> 外文期刊>International Polymer Processing: The Journal of the Polymer Processing Society >A 3D Simulation Analysis of Reactive Flow in Screw Elements of Closely Intermeshing Twin Screw Extruders
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A 3D Simulation Analysis of Reactive Flow in Screw Elements of Closely Intermeshing Twin Screw Extruders

机译：紧密啮合双螺杆挤出机螺杆元件中无功流动的3D模拟分析

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摘要

The peroxide-initiated degradation of polypropylene in conventional screw elements of closely intermeshing twin-screw extruders is analyzed by means of a three-dimensional (3D) simulation approach. The 3D simulations of the reacting flow are implemented under the assumption of steady-state flow conditions, and scale-up considerations are addressed by simulating screw elements of two different size extruders. The effects of the initial peroxide concentration and reference mass throughputs on processing parameters are analyzed in terms of the specified extruder size. In this study, the scaled-up mass throughput is determined under the assumption of constant residence time. For the implemented processing conditions, the final values of the weigh-average molecular weight (Mw) and polidispersity index (PDI) for both the reference and scaled-up screw elements are similar when the flow rate is close to that corresponding to the maximum conveying capacity of the screw elements. For more restricted flow conditions, however, lower values of both the Mw and PDI are obtained for the larger screw element. Additionally, a previously proposed scale-up procedure from one-dimensional (ID) simulations is evaluated by means of a 3D simulation analysis. The results of this evaluation show a good agreement between the trend of the 3D and ID simulation results.
机译：通过三维（3D）模拟方法分析了紧密啮合的双螺杆挤出机中常规螺杆元件中聚丙烯的过氧化物引发的降解。在稳态流动条件下进行反应流的3D模拟，并通过模拟两个不同尺寸的挤出机的螺杆元件来解决放大问题。根据指定的挤出机尺寸分析了初始过氧化物浓度和参考质量通过量对加工参数的影响。在这项研究中，在恒定停留时间的假设下确定了按比例增加的物料通过量。对于已实现的加工条件，当流速接近对应于最大输送量的流速时，参比和按比例放大的螺杆元件的重均分子量（Mw）和多分散指数（PDI）的最终值相似螺杆元件的容量。但是，对于更受限的流动条件，对于较大的螺杆元件，Mw和PDI均较低。另外，借助3D模拟分析评估了先前提出的一维（ID）模拟放大过程。评估结果表明3D趋势和ID模拟结果之间有很好的一致性。

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