화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea-Australia Rheology Journal, Vol.13, No.2, 97-106, June, 2001
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Three dimensional flow analysis within a profile extrusion die by using control volume finite-element method
Jongman Kim, Jae Ryoun Youn†, and Jae Chun Hyun1
  • School of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea
  • 1Department of Chemical Engineering, Korea University, Seoul 136-701, Korea
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Three-dimensional flow analysis was performed by using the control volume finite-element method for design of a profile extrusion die. Because polymer melt behavior is complicated and cross-sectional shape of the profile extrusion die is changing continuously, the fluid flow within the die must be analyzed three-dimensionally. A commercially available polypropylene is used for theoretical and experimental investigations. Material properties are assumed to be constant except for the viscosity. The 5-constant modified Cross model is used for the numerical analysis. A test problem is examined in order to verify the accuracy of the numerical method. Simulations are performed for conditions of three different screw speeds and three different die temperatures. Predicted pressure distribution is compared with the experimental measurements and the results of the previous two-dimensional study. The computational results obtained by using three dimensional CVFEM agree with the experimental measurements and are more accurate than those obtained by using the two-dimensional cross-sectional method. The velocity profiles and the temperature distributions within several cross-sections of the die are given as contour plots.
Keywords:profile extrusion die;CVFEM;5-constant modified Cross model;three-dimensional numerical simulation
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