The evolution of crystalline structures under complicated dynamic conditions remains elusive in practical processing techniques including multi-melt multi-injection molding (M³IM), due to the obstacles in expressing the coupled external fields. Herein, we exploited the finite volume method (FVM) and the volume of fluid (VOF) method to uncover the coupled external fields of multi-melt flows in M³IM. The simulation results show that the shear rate curve changes significantly as the injection temperature of the second melt increases, while the shear fields and the shear heat significantly enhance as the injection speed of the second melt increases. Combined with the experimental observations, the relationship between the coupled external fields and the hierarchical crystalline structures is presented to elucidate the patterns and critical conditions for the formation of the diverse crystalline structures. This work paints a comprehensive picture of features governing the formation of hierarchical crystalline structures.

由于表示耦合外部场的障碍，在复杂的动态条件下晶体结构的演化在包括多熔体多注射成型（M ³ IM）在内的实际加工技术中仍然难以捉摸。在本文中，我们利用有限体积法（FVM）和流体体积（VOF）方法来揭示M ³中多熔体流的耦合外部场。我是。仿真结果表明，随着第二熔体注入温度的增加，剪切速率曲线发生明显变化，而随着第二熔体注入速度的增加，剪切场和剪切热显着增强。结合实验观察，提出了耦合的外部场与分层晶体结构之间的关系，以阐明形成各种晶体结构的模式和关键条件。这项工作描绘了控制分级晶体结构形成的特征的综合图景。