Numerical analysis of a new mound-shaped extensional mixing element designed based on a sine curve in single-screw extrusion

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-05-03 DOI:10.1515/ipp-2022-4319

Hezhi He, Weijie Li, Zong‐ji Huang, Guidong Tian, Z. Zhu

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Abstract

Abstract The rapid development of polymer blends and nanocomposites has put forward new requirements for the mixing performance of extruders. In comparison with shear flow field, extensional flow field has been shown to have unique advantages in improving dispersive mixing performance and reducing energy consumption. However, building an extensional flow field in a conventional single-screw extruder remains challenging. In this work, a new mound-shaped extensional mixing element (M-EME) was designed based on the geometric characteristics of a sine curve. To investigate the effect of this M-EME on the mixing properties of a conventional single-screw extruder, a numerical simulation analysis of this M-EME was performed. The results showed that the proportion of the region with a mixing index greater than 0.55 in the M-EME was higher than 43 %, and that the highest mixing index of the M-EME reached around 0.9, confirming the dominance of the extensional flow field in the M-EME. Moreover, it was observed that the changes in amplitude and period of the sine function have no significant effect on the distribution of the mixing index. The findings from this work provide a viable way to generate extensional flow fields in conventional screw extruders.

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单螺杆挤压中基于正弦曲线设计的新型土墩型拉伸混合单元的数值分析

高分子共混物和纳米复合材料的快速发展对挤出机的混炼性能提出了新的要求。与剪切流场相比，伸展流场在提高分散混合性能和降低能耗方面具有独特的优势。然而，在传统的单螺杆挤出机中建立拉伸流场仍然具有挑战性。本文根据正弦曲线的几何特性，设计了一种新型的土墩型外延混合单元。为了研究M-EME对常规单螺杆挤出机混合性能的影响，对M-EME进行了数值模拟分析。结果表明:M-EME中混合指数大于0.55的区域比例大于43 %，M-EME的最高混合指数达到0.9左右，证实了伸展流场在M-EME中占主导地位。此外，观察到正弦函数振幅和周期的变化对混合指数的分布没有显著影响。本文的研究结果为在常规螺杆挤出机中产生拉伸流场提供了一条可行的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.