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The effect of solidification on the casting window after bubble entrainment

机译：气泡夹带后凝固对浇铸窗的影响

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The objective of this work is to investigate the feasibility of extending the velocity boundary during the slot die casting of a polymer film, by studying the dynamics of entrained bubbles as they transition from the fluid to the solid phase. The solution of interest is a relatively high viscosity non-Newtonian solution. A 2D computational fluid dynamics model, using ANSYS FLUENT 13.0 software, was developed to analyze this behavior. The volume of fluid method and enthalpy-porosity technique were used to track the air (i.e., entrained bubbles) and fluid phases and the solidification of the solution, respectively. It has been found that for this class of solution, bubbles that are entrained in the fluid phase will not diffuse out of the fluid due to the stresses formed during solidification. Thus, for relatively high viscosity non-Newtonian solution, the upper boundary of the casting window cannot be extended after a defect has originated in the film during the casting process.
机译：这项工作的目的是通过研究夹带气泡从流体过渡到固相时的动力学，研究在聚合物薄膜的狭缝压铸过程中扩展速度边界的可行性。感兴趣的溶液是相对较高粘度的非牛顿溶液。使用ANSYS FLUENT 13.0软件开发了二维计算流体动力学模型来分析此行为。流体体积法和焓-孔隙率技术分别用于跟踪空气（即夹带的气泡）和流体相以及溶液的固化。已经发现，对于这类溶液，由于在凝固过程中形成的应力，在流体相中夹带的气泡不会从流体中扩散出来。因此，对于较高粘度的非牛顿溶液，在流延过程中膜中已经产生缺陷之后，流延窗的上边界不能延伸。

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