微孔塑料挤出快速降压口模的数值模拟

应用FLUENT软件对微孔塑料连续挤出成型过程中的快速降压口模内的熔体流动进行数值模拟，经过简化及边界处理，分别研究了微孔塑料在不同CO2浓度、不同流量和不同温度条件下微孔塑料连续挤出过程中快速降压口模中的压力和速度分布情况。结果表明:压力降随熔体温度和CO2浓度的升高而降低，随熔体流量的升高而增大。导管中的速度也几乎均匀分布，在毛细管人口处中心线速度突然增大。熔体流量和CO2浓度的变化对口模压降和口模速度的影响比较大，而温度的变化对其影响要小得多。

umerical Simulation of Microcellular Plastics Extrusion in Pressure Drop Die

the distribution of pressure and velocity in the pressure drop die for microcellular polymer extrusion was simulated using FLUENT software with the structures and boundary conditions simplified.It was found that the pressure drop decreased with increasing melt temperature and CO2 concentration and increased with increasing melt flux. the velocity distribution in the vessel was uniform, but increased suddenly at the entrance of capillary. Pressure drop and velocity was influenced greatly by melt flow and CO2 concentration and only moderately by temperature.