建立了气辅条件下两种聚合物在矩形流道中共挤出流动的三维非等温数值分析模型。用粘弹性流体模型（PTT模型）描述熔融聚合物的特性,Arrhenius方程表示流动对温度的依赖性,并且考虑聚合物相对于流道壁面的滑移以及不相容聚合物熔体间滑移的边界条件。用有限元方法数值模拟了聚合物成型过程,将计算结果与普通共挤出成型流动进行了对比分析。结果表明,气垫层的加入,将使聚合物熔体的压力降减低20%～40%;使流道出口处的速度场分布均匀,速度场的最大值下降约50%;气垫区聚合物的自由流动还将对共挤出界面的形状和位置有一定的影响。
The three-dimensional non-isothermal numerical simulation model of two polymers flow through the rectangle path on the condition of gas assisted was founded.The polymer melts obey a differential constitutive equation（Phan-Thien and Tanner model）.The temperature-dependent transport properties were taken into account and were expressed by the Arrhenius equation.The slipping boundary condition near the die wall and between the two polymers was also considered.The gas assisted coextrusion process was analyzed by using the finite element method.The simulated results of the gas assisted coextrusion and the general coextrusion were analyzed contrastively.It is found that the gas assisted mechanism influences the fluid process greatly.The pressure dropping falls 20%~40%.The velocity distribution at the exit is more uniform.The maximum value of the velocity descends about 50%.The shape and the location of the polymer interface are also changed due to the gas zone.
参考文献
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