SCI和EI收录∣中国化工学会会刊

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

• FLUID FLOW AND TRANSPORT PHENOMENA • Previous Articles     Next Articles

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

YANG Binxin1, OUYANG Jie1, LIU Chuntai2, LI Qiang1   

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

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. 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
  • 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)

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

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