聚酯熔体输送过程中静态混合器混合性能与传热性能的数值模拟 摘要
在聚酯加工过程中，熔体的输送过程是决定熔体品质很重要的一环。为提高熔体品质，解决熔体在输送过程中所产生的问题是至关重要的。对此，多数企业选择在熔体运输管路中添加一段静态混合器来提高熔体在管道内的温度均匀性与混合均匀性。但在对静态混合器的混合能力进行评估时并不能通过直接测量的方法得出结果，而采用有限元数值模拟的方法可以解决计算相关的问题。本文采用了有限元数值模拟的方法，对不同类型静态混合器的混合性能与传热性能做出评估，并在此基础上对静态混合器的结构进行优化，以期达到更加优异的混合效果与传热效果。
首先是对两种选型的静态混合器进行结构优化与重组，并对其混合能力进行评估。模拟结果证实，元件结构的更改会对混合能力产生影响，不同类型的静态混合器产生影响的方面不同。将两种混合器元件进行组合后，新型静态混合器则结合了两种静态混合器的优点，弥补了原有静态混合器的不足，混合性能表现得更加优异，证实组合型静态混合器的提出对提高静态混合器的混合性能是有意义的。
其次，考虑到将静态混合器作为换热器使用，需要对不同类型静态混合器的传热能力进行评估。不同
元件结构的模拟结果证实，元件优化后的静态混合器传热能力更强，温度分散均匀性更高。将两种元件进行组合后的静态混合器，提高了出口位置熔体的温度均匀性，并对两种静态混合器的缺点进行了弥补，证实组合型静态混合器具备更加优异的传热性能。
最后，对前面提出的组合型静态混合器进行工艺条件的改变，探究管径对其混合性能与传热性能的影响。通过对不同管径的静态混合器混合性能与传热性能的变化分析，证实过度增加管径会对混合能力产生削弱。适当提高管径可以在在提高熔体温度分布均匀性的同时降低对混合能力的削弱，这对于管道设计与静态混合器的管径选择具有指导意义，对提高熔体品质具有重要作用。
关键词：熔体输送；静态混合器；结构优化；混合能力；传热能力
浙江理工大学硕士学位论文
Numerical simulation of mixing and heat transfer
performance of static mixer in polyester melt pipeline
Abstract
In the polyester processing process, the melt transport process is the most important part of determi
ning melt quality. In order to improve the quality of the melt, it is crucial to solve the problems caused by the melt during the conveying process. In this regard, most companies choose to add a static mixer to the melt transport line to improve the temperature uniformity and mixing uniformity of the melt in the pipeline. However, the results of the static mixer's mixing ability cannot be obtained by direct measurement, and the finite element numerical simulation method can solve the calculation-related problems. In this paper, the finite element numerical simulation method is used to evaluate the mixing performance and heat transfer performance of different types of static mixers. Based on this, the structure of the static mixer was optimized to achieve a more excellent mixing effect and transmission and thermal effect.
The first was optimized and reorganized the two types of static mixers and evaluate their mixing performance. The mixing ability of different types of static mixers has been confirmed by simulation results. Simulation results confirm that changes in component structure can have an impact on mixing capabilities, and different types of static mixers have different effects. After combining the two mixer elements, the new static mixer combines the advantages of two static mixers to make up for the shortcomings of the original static mixer, and the mixing performance was more excellent. It makes sense to put forward the combined static mixer to improve the mixing performance of static mixers.
Second, considering the use of static mixers as heat exchangers, the heat transfer capabilities of different types of static mixers need to be evaluated. The simulation results of different component structures confirmed that the static mixer with
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