Design and Optimization of Online Dynamic Mixer and Its Performance Analysis

IF 1.1 4区工程技术 Q4 MECHANICS

Journal of Applied Fluid Mechanics Pub Date : 2023-09-01 DOI:10.47176/jafm.16.09.1752

Y. W. Zheng, J. Wang, J. Sun, C. Wang

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引用次数: 0

Abstract

In this study, a dynamic mixer was designed to mix polymer melts online during extrusion, and the flow of a polymer melt in a mixer was simulated using Polyflow software. The Orthogonal experiment was conducted to analyze the effects of three geometrical parameters (i.e. the length of entrance zone (Li), the gap between the rotor and wall (g), and the diameter of cone-shaped rotor (d2)) on mixing properties of a dynamic mixer. The Li, g, and d2 were optimized for the minimum product of segregation scale (S) and power consumption (P). Finally, the mixing properties of the dynamic mixer were compared with those of SK and SX static mixers. The results indicated that among the above-mentioned three parameters, the g was the most important parameter influencing S, and S∙P. The minimum S∙P of 1059 µm·W was obtained when the Li was 16 mm, the g was 1 mm, and the d2 was 24 mm. The S decreased with the increase of the rotation speed from 120 to 360 r/min, and increased with the increase of the flow rate from 15 to 45 mL/min. However, the P increased with the increase of both the rotation speed and flow rate. The maximum shear rate of the melt in the dynamic mixer was observed in the mixing zone, which was mainly affected by the rotation speed rather than the flow rate. To achieve the S of the same size, the length of the dynamic mixer was the shortest, and that of the SK static mixer was the longest. Moreover, to acquire the S of the same size, the dynamic mixer required the largest P, the SX static mixer needed a smaller P, and the SK static mixer required the minimum P.

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在线动态混合器的设计与优化及其性能分析

在这项研究中，设计了一个动态混合器来在挤出过程中在线混合聚合物熔体，并使用Polyflow软件模拟了聚合物熔体在混合器中的流动。通过正交实验，分析了三个几何参数（即入口区长度（Li）、转子与壁之间的间隙（g）和锥形转子直径（d2））对动态混合器混合性能的影响。针对分离规模（S）和功耗（P）的最小乘积，对Li、g和d2进行了优化。最后，将动态混合器与SK和SX静态混合器的混合性能进行了比较。结果表明，在上述三个参数中，g是影响S的最重要参数，S∙P。当Li为16 mm，g为1 mm，d2为24 mm时，获得了1059µm·W的最小S∙P。S随着转速从120到360 r/min的增加而减小，而随着流速从15到45 mL/min的增加而增大。然而，P随着转速和流量的增加而增加。在混合区观察到动态混合器中熔体的最大剪切速率，其主要受转速而非流速的影响。为了实现相同大小的S，动态混频器的长度最短，SK静态混频器的长度最大。此外，为了获得相同大小的S，动态混频器需要最大的P，SX静态混频器需要较小的P，SK静态混频器需要最小的P。

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

Journal of Applied Fluid Mechanics THERMODYNAMICS-MECHANICS

CiteScore

2.00

自引率

20.00%

发文量

138

审稿时长

>12 weeks

期刊介绍： The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating. The motivation for this new fluid mechanics journal is driven by the following points: (1) there is a need to have an e-journal accessible to all fluid mechanics researchers, (2) scientists from third- world countries need a venue that does not incur publication costs, (3) quality papers deserve rapid and fast publication through an efficient peer review process, and (4) an outlet is needed for rapid dissemination of fluid mechanics conferences held in Asian countries. Pertaining to this latter point, there presently exist some excellent conferences devoted to the promotion of fluid mechanics in the region such as the Asian Congress of Fluid Mechanics which began in 1980 and nominally takes place in one of the Asian countries every two years. We hope that the proposed journal provides and additional impetus for promoting applied fluids research and associated activities in this continent. The journal is under the umbrella of the Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT) .