基于VOF模型的层叠器流动过程分析及流道结构优化

doi:10.19491/j.issn.1001-9278.2020.05.011

中国塑料 ›› 2020, Vol. 34 ›› Issue (5): 63-67.DOI: 10.19491/j.issn.1001-9278.2020.05.011

基于VOF模型的层叠器流动过程分析及流道结构优化

宋果, 马玉录, 谢林生(), 朱惠豪

华东理工大学绿色高效过程装备与节能教育部工程研究中心，上海 200237

收稿日期:2020-02-10 出版日期:2020-05-26 发布日期:2020-05-22
基金资助:
国家科工局基础材料创新专项

Flow Process Analysis and Channel Structure Optimization of Laminator Based on VOF Model

Guo SONG, Yulu MA, Linsheng XIE(), Huihao ZHU

Engineering Center of Efficient Green Process Equipment and Energy Conservation of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

Received:2020-02-10 Online:2020-05-26 Published:2020-05-22
Contact: Linsheng XIE E-mail:lsxie@ecust.edu.cn

摘要/Abstract

摘要：

基于FLUENT软件的流体体积（VOF）模型研究了不同壁面滑移程度以及不同流道结构参数下4层等厚熔体通过层叠器倍增为8层熔体时，流道中熔体的分层情况变化。结果表明，壁面滑移程度的降低会促使熔体在上下壁面聚集，进而导致上下壁面处熔体层厚增加；汇流段与出口段间圆角半径、汇流段扩压角和平衡段长度这3个结构参数则只会影响熔体在左右壁面的聚集，进而影响各层熔体的尺寸精度，且其中扩压角的影响程度最大，平衡段长度次之，圆角半径的影响较小。

关键词: 层叠器流道, 流体体积模型, 结构优化

Abstract:

Based on the FLUENT software, the VOF model was adopted to study the changes of the melt delamination in the flow channel when the four?layer melt was multiplied to the eight?layer one by a laminator under different wall slip degrees and flow channel structure parameters. The analysis results indicated that the reduction of the degree of wall slip led to the accumulation of the melt on the upper and lower wall surfaces. This led to an increase in thickness of the melt layer at the upper and lower wall surfaces. The three structural parameters of fillet radius between the confluence section and the exit section, expansion angle of the confluence section and length of the equilibrium section only affected the accumulation of the melt on the left and right wall surfaces and therefore inflenced the dimensional accuracy of the melt in each layer. The influence of the angle was most signficant, followed by the length of equilibrium section. However, the influence was least from the radius of the fillet.

Key words: layer multiplier flow channel, volume of fluid model, structure optimization

中图分类号:

TQ320.6

宋果, 马玉录, 谢林生, 朱惠豪. 基于VOF模型的层叠器流动过程分析及流道结构优化[J]. 中国塑料, 2020, 34(5): 63-67.

Guo SONG, Yulu MA, Linsheng XIE, Huihao ZHU. Flow Process Analysis and Channel Structure Optimization of Laminator Based on VOF Model[J]. China Plastics, 2020, 34(5): 63-67.

图/表 10

图1 层叠器流道的几何模型

Fig.1 Geometric model of the flow channel of the layer multiplier

流道	长度/mm	横截面尺寸/mm×mm
进口段	10	64×10
分流段	60	32×10
平衡段	0~40	32×10
汇流段	27.7~182.9	32×10~64×5
出口段	20	64×10

表1 层叠器各段流道的长度及横截面尺寸

Tab.1 Length and cross section size of each channel of the layer multiplier

图2 层叠器流道的有限元模型

Fig.2 Finite element model of the flow channel of the layer multiplier

材料种类	零剪切黏度/Pa·s	松弛时间/s	幂律指数	密度/kg·m^-3
PP	5 500	0.3	0.6	910
PA6	8 900	0.2	0.5	1 140

表2 PP和PA6熔体的物性参数

Tab.2 Melt properties of PP and PA6

图3 进口边界中的熔体分布图

Fig.3 Melt distribution diagram at the inlet boundary

图4 壁面无滑移条件下出口截面各层熔体的分布及平均厚度

Fig.4 Distribution and average thickness of melt at each layer of outlet section under the condition of no slip on the wall

图5 壁面剪切应力对出口截面底层熔体平均厚度的影响

Fig.5 Effect of wall shear stress on the average thickness of bottom melt at outlet section

图6 圆角半径对出口截面底层熔体最大厚度误差的影响

Fig.6 Effect of fillet radius on maximum thickness error the bottom melt at the outlet section（τ=673 Pa，L=40 mm，α=20 °）

图7 平衡段长度对出口截面底层熔体最大厚度误差的影响

Fig.7 Effect of equilibrium length on the maximum thickness error of the bottom melt at the outlet section（τ=673 Pa，R=20 mm，α=20 °）

图8 扩压角对出口截面底层熔体最大厚度误差的影响

Fig.8 Effect of divergence angle on the maximum thickness error of the bottom melt at the outlet section（τ=673 Pa，R=20 mm，L=20 mm）

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基于VOF模型的层叠器流动过程分析及流道结构优化

Flow Process Analysis and Channel Structure Optimization of Laminator Based on VOF Model

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