文献类型：期刊文献

英文题名：A Finite Piece Method for Simulating Polymer Melt Flows in Extrusion Sheet Dies

作者：Li, Yong[1];Zheng, Jianrong[1];Xia, Chunmin[1];Zhou, Wei[1]

机构：[1]E China Univ Sci & Technol, Dept Mech Engn, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2012

卷号：123

期号：6

起止页码：3189

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20115014593165);WOS:【SCI-EXPANDED(收录号:WOS:000298086500001)】；

语种：英文

外文关键词：polymer extrusion; viscoelastic properties; simulations; PTT constitutive equation; the finite element method

摘要：A finite piece method is proposed to simulate three-dimensional slit flows in extrusion sheet dies in this paper. The simulations concern incompressible fluids obeying different constitutive equations: generalized Newtonian (Carreau-Yasuda law), and viscoelastic Phan-Thien Tanner (PTT) models. Numerical simulations are carried out for the isothermal and nonisothermal flows of polymer melt through sheet dies. The Picard iteration method is utilized to solve nonlinear equations. The results of the finite piece method are compared with the three-dimensional (3D) finite element method (FEM) simulation and experiments. At the die exit, the relative error of the volumetric flow between the finite piece method and the 3D FEM is below 1.2%. The discrepancy of the pressure distributions does not exceed 6%. The Maximum error of the uniformity index between the simulations and experiments is about 2.3%. It shows that the solution accuracy of the finite piece method is excellent, and a substantial amount of computing time and memory requirement can be saved. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 123: 3189-3198, 2012