中南大学学报（自然科学版）2016，Vol.47Issue(7)：2227-2234,8.DOI:10.11817/j.issn.1672-7207.2016.07.007
气辅共挤精密成型中2种方法处理气体层的比较
Comparison of two methods for gas layer in gas-assisted precision co-extrusion molding
摘要
Abstract
Three-dimensional non-isothermal mathematical models were established for two-layer gas-assisted precision co-extrusion through a L-shaped channel based on the gas layer simplified as the full-slip boundary condition or the incompressible fluid. The Phan-Thien and Tanner (PTT) model was considered as viscoelastic constitutive equations. The numerical simulations were presented using the finite element method and the results were compared and analyzed. The results show that velocity, pressure, shear-rate, stress and temperature distribution of making gas layer as the full-slip boundary condition coincide with those of making gas layer as the incompressible fluid, but the melt boundary and interface profile are different at the die exit. By comparing the simulation results with experimental ones, it is shown that the former is more reliable.关键词
气辅共挤/气垫层/不可压缩流体/非等温/数值模拟Key words
gas-assisted co-extrusion/gas layer/incompressible fluid/non-isothermal/numerical simulation分类
化学化工引用本文复制引用
邓小珍,柳和生,黄益宾,黄兴元,何建涛..气辅共挤精密成型中2种方法处理气体层的比较[J].中南大学学报（自然科学版）,2016,47(7):2227-2234,8.基金项目
国家自然科学基金资助项目(51163011)；江西省青年科学基金资助项目(20122BAB216012)(Project(51163031) supported by the National Natural Science Foundation of China （51163011）
Project(20122BAB216012) supported by the Natural Science Foundation of Jiangxi Province of China) （20122BAB216012）
