二軸スクリュ押出機の性能に関する理論的研究第3報 かみ合い同方向回転セルフクリーニング型二軸スクリュを用いた三次元流動解析
Theoretical Study on Performance of a Twin Screw ExtruderIII. Three-dimensional Flow Analysis in an Intermeshing Co-rotating Self-cleaning Type Twin Screw Extruder
劉 麗潔・長嶋勇希・梶原稔尚・船津和守
Liu, Lijie / Nagashima, Yuki / Kajiwara, Toshihisa / Funatsu, Kazumori
A Three-dimensional flow analysis of the transportation elements in an intermeshing co-rotating self-cleaning twin screw extruder was carried out using the finite element method. In the present paper, two types of self-cleaning twin screws were used for simulation in order to observe the influence of the screw configurations. The velocity profile, transportation flow rate, leakage flow rate and maximum shear stress profile have been compared for both types of screws. The maximum shear stress history, residence time distribution and deformation history for the fluid elements have been discussed using the numerical results of the tracer experiment. The results suggest that the transportation capacity is higher in the stronger self-cleaning twin screw than in the weaker self-cleaning twin screw. The stronger self-cleaning twin screw has a narrower residence time distribution which is difficult to be affected by the back pressure gradient.
Key words: Self-cleaning twin screw extruder / Three-dimensional flow analysis / Non-Newtonian flow / Finite element method