Statistical research on the mixing properties of wave based screws by numerical simulations

IF 1.1 4区工程技术 Q4 ENGINEERING, CHEMICAL

International Polymer Processing Pub Date : 2023-02-15 DOI:10.1515/ipp-2022-4253

Tian Liu, Yaoxue Du, Xiangdong He

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引用次数: 1

Abstract

Abstract Research based on numerical simulation with the CFD software ANSYS POLYFLOW is conducted on the mixing properties for the wave screw elements, as well as barrier screw elements, by using statistical tools. Then, the investigation is conducted in detail on the relationship between pressure, maximum shear rate, mixing index and other flow field characteristics of the two above screws under the same simulation conditions. It is found that polymer melt flow in the wave screw possesses various advantages compared with the normal barrier screw, such as acquiring larger pressure, stronger shearing and stretching action, better mixing and efficiency, which mainly result from the periodic depth change design in the screw groove. On the other hand, the increased wave bulge in the wave screw lessens the space for the polymer melt to be conveyed forward, which can greatly reduce the original function of the secondary flight. Also, the convergent and divergent zones in the wave screw groove produce a much stronger stress favoring the shear and elongation rates, and also lead to a sharp increase of the axial force load on the wave screw. Consequently, for the optimization of the wave screw configuration it is suggested to reduce the axial force without decreasing the effect of the excellent distributive and dispersive mixing.

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波浪型螺杆混合特性的数值模拟统计研究

摘要利用CFD软件ANSYS POLYFLOW进行数值模拟，利用统计工具对波浪螺杆单元和屏障螺杆单元的混合特性进行了研究。然后，详细研究了在相同模拟条件下，上述两种螺杆的压力、最大剪切速率、混合指数等流场特性之间的关系。研究发现，与普通屏障螺杆相比，波浪螺杆内聚合物熔体流动具有压力更大、剪切和拉伸作用更强、混合效果更好、效率更高等优点，这主要得益于螺杆槽的周期性深度变化设计。另一方面，波螺杆中增大的波胀减少了聚合物熔体向前输送的空间，大大降低了二次飞行的原有功能。波浪螺杆槽内的收敛区和发散区产生了更强的应力，有利于剪切率和延伸率，也导致波浪螺杆上的轴向力载荷急剧增加。因此，对于波螺杆构型的优化，建议在不影响良好的分布和分散混合效果的前提下减小轴向力。

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来源期刊

International Polymer Processing 工程技术-高分子科学

CiteScore

2.20

自引率

7.70%

发文量

审稿时长

6 months

期刊介绍： International Polymer Processing offers original research contributions, invited review papers and recent technological developments in processing thermoplastics, thermosets, elastomers and fibers as well as polymer reaction engineering. For more than 25 years International Polymer Processing, the journal of the Polymer Processing Society, provides strictly peer-reviewed, high-quality articles and rapid communications from the leading experts around the world.