螺棱断面形状对单螺杆挤出机熔融输送段的影响

采用数值分析方法分析了单螺杆挤出机螺杆的螺棱断面形状对PVC木塑材料熔融输送段熔融过程的影响.采用流变实验，获得PVC木塑材料的黏度数据，由幂律模型与近似阿雷尼克斯模型共同给出黏度模型，并运用Polyflow中Polymat模块对实验数据进行拟合，获得数值分析研究所需物料流变参数；应用PRO/E建立三维实体模型，采用Gambit进行网格划分，运用Polyflow的网格重叠技术并生成叠加网格文件，确定物料参数和边界条件后建立了数值分析模型，求解得到不同螺棱断面形状对PVC木塑单螺杆挤出机熔融输送段各流场的影响. 

Effects of Screw Arris Cross Section Shapes in the Melt Conveying Section of Single-Screw Extruder

A numerical analysis method was used to study the effects of the screw arris cross section shapes on the melting process in the melt conveying section in a PVC wood-plastics single-screw extruder. Several rheological experiments were taken to obtain the material viscosity of PVC wood-plastics. The power law model and an approximate Porto Nix model were employed together to get the viscosity model. Polyflow Polymat module was used to fit experimental data and to obtain the rheological parameters of required material in the numerical analysis. A three-dimensional model was developed with Pro/E and the corresponding mesh file was established by GAMBIT and Polyflow mesh superposition techniques (MST). Then the numerical analysis model was established after determining material parameters and boundary conditions. Based on the simulation results, the effects of screw arris cross section shapes on the flow field in melt conveying section of the PVC wood-plastics single-screw extruder was analyzed.