Simulation of Non-isothermal Injection Molding for a Non-Newtonian Fluid by Level Set Method

›› 2010, Vol. 18 ›› Issue (4): 600-608.

Simulation of Non-isothermal Injection Molding for a Non-Newtonian Fluid by Level Set Method

杨斌鑫¹, 欧阳洁¹, 刘春太², 李强¹

1. School of Science, Northwestern Polytechnical University, Xi'an 710129, Shaanxi, China;
2. National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China

收稿日期:2010-01-17 修回日期:2010-06-16 出版日期:2010-08-28 发布日期:2010-08-28
通讯作者: OUYANG Jie, E-mail:jieouyang@nwpu.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China(10871159);the National Basic Research Program of China(2005CB321704)

Simulation of Non-isothermal Injection Molding for a Non-Newtonian Fluid by Level Set Method

YANG Binxin¹, OUYANG Jie¹, LIU Chuntai², LI Qiang¹

1. School of Science, Northwestern Polytechnical University, Xi'an 710129, Shaanxi, China;
2. National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China

Received:2010-01-17 Revised:2010-06-16 Online:2010-08-28 Published:2010-08-28

摘要/Abstract

摘要： A non-isothermal injection molding process for a non-Newtonian viscous pseudoplastic fluid is simulated.A conservative interface capturing technique and the flow field solving method are coupled to perform a dynamic simulation.The validity of the numerical method is verified by a benchmark problem.The melt interface evolution versus time is captured and the physical quantities such as temperature,velocity and pressure at each time step are obtained with corresponding analysis.A"frozen skin"layer with the thickness increasing versus time during the injection process is found.The fact that the"frozen skin"layer can be reduced by increasing the injection velocity is numerically verified.The fountain flow phenomenon near the melt interface is also captured.Moreover,comparisons with the non-isothermal Newtonian case show that the curvatures of the interface arcs and the pressure contours near the horizontal mid-line of the cavity for the non-Newtonian pseudoplastic case is larger than that for the Newtonian case.The velocity profiles are different at different positions for the non-Newtonian pseudoplastic case,while in the case of Newtonian flow the velocity profiles are parabolic and almost the same at different positions.

关键词: injection molding, Level Set Method, two-phase flow, non-isothermal, non-Newtonian flow

Abstract: A non-isothermal injection molding process for a non-Newtonian viscous pseudoplastic fluid is simulated.A conservative interface capturing technique and the flow field solving method are coupled to perform a dynamic simulation.The validity of the numerical method is verified by a benchmark problem.The melt interface evolution versus time is captured and the physical quantities such as temperature,velocity and pressure at each time step are obtained with corresponding analysis.A"frozen skin"layer with the thickness increasing versus time during the injection process is found.The fact that the"frozen skin"layer can be reduced by increasing the injection velocity is numerically verified.The fountain flow phenomenon near the melt interface is also captured.Moreover,comparisons with the non-isothermal Newtonian case show that the curvatures of the interface arcs and the pressure contours near the horizontal mid-line of the cavity for the non-Newtonian pseudoplastic case is larger than that for the Newtonian case.The velocity profiles are different at different positions for the non-Newtonian pseudoplastic case,while in the case of Newtonian flow the velocity profiles are parabolic and almost the same at different positions.

Key words: injection molding, Level Set Method, two-phase flow, non-isothermal, non-Newtonian flow

杨斌鑫, 欧阳洁, 刘春太, 李强. Simulation of Non-isothermal Injection Molding for a Non-Newtonian Fluid by Level Set Method[J]. , 2010, 18(4): 600-608.

YANG Binxin, OUYANG Jie, LIU Chuntai, LI Qiang. Simulation of Non-isothermal Injection Molding for a Non-Newtonian Fluid by Level Set Method[J]. , 2010, 18(4): 600-608.

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Simulation of Non-isothermal Injection Molding for a Non-Newtonian Fluid by Level Set Method

Simulation of Non-isothermal Injection Molding for a Non-Newtonian Fluid by Level Set Method

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