Three-dimensional viscoelastic numerical analysis of the encapsulation phenomena in coextrusion

被引:1
作者
Masanori Takase
Shin-ichi Kihara
K. Funatsu
机构
[1] Department of Chemical Systems and Engineering Graduate School of Engineering Kyushu University Hakozaki,
[2] Higashi-ku,undefined
[3] Fukuoka 812-8581 Japan E-mail: makun@apex.chem-eng.kyushu-u.ac.jp,undefined
来源
Rheologica Acta | 1998年 / 37卷
关键词
Key words; Encapsulation phenomena; second normal stress difference; three-dimensional viscoelastic; analysis;
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摘要
In recent years coextrusion process had gained wide recognition as an approach to achieving high quality or quantity and low costs by multilayered system as well as an polymer alloy or blend. We performed a strict 3-D numerical simulation with viscoelastic model on the encapsulation phenomena which is one of the problems in the coextrusion process. The effects of material properties such as viscosity ratio, extensional viscosity and second normal stress difference and an effect of flow rate ratios on the encapsulation phenomena were examined. Numerical results showed that encapsulation phenomena were affected by not only viscous properties but also elastic properties or non-linear properties. It was found that the difference of second normal stress differences working on the interface between fluid I and fluid II (we defined it as DN2) had a correlation with the interface shape.
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页码:624 / 634
页数:10
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