Numerical Simulation of the Sequential Coinjection Molding Process Based on Level Set Method

作者：Liu, Qingsheng; Ouyang, Jie^*; Zhou, Wen; Xu, Xiaoyang; Zhang, Lin

来源：Polymer Engineering and Science, 2015, 55(8): 1707-1719.

DOI：10.1002/pen.24009

• INTERFACE DEVELOPMENT
• MECHANICAL-PROPERTIES
• INJECTION
• FLOW
• ENCAPSULATION

The sequential coinjection molding (SCIM)process has always been regarded as a challenging multiphase flow problem, which includes skin and core polymer melts together with gas. Thus, this article presents a 3D mathematical model for it, in which the governing equations of gas, skin, and core melts are united into a system namely the generalized Navier-Stokes equations. By doing this, the model can be solved simply by applying the finite volume SIMPLE method on the collocated grid. The core penetration process is simulated by level set method, which can capture two different types of moving interface simultaneously at different time. By simulating the SCIM process of a centrally gated rectangular plate and then comparing the numerical results with available experiment results, the proposed mathematical model is validated and the influences of skin/core volume ratio, injection temperature, and core injection delay on the depth of core penetration are analyzed in detail. Then, the sequential coinjection of a line-gated plate is investigated numerically, obtaining some important information in the gap-wise direction, which cannot be caught by 2.5D model. All the numerical results show that the multiphase flow model proposed in this article is effective and can be used to describe the flow behaviors of polymer melt in the SCIM process.

• 出版日期2015-8
• 单位西北工业大学