假设聚丙烯/超临界CO2微孔发泡气泡长大为等温过程,结合动量方程、质量方程、扩散方程以及本构方程建立了气泡长大问题的数学模型.利用可视化间歇发泡实验结果对模型进行了验证,研究了初始气泡大小、形核密度、饱和压力、压强降速率和聚合物粘弹性对气泡长大的影响.结果表明,形核密度的增加、饱和压力和压强降的降低都会阻碍气泡的长大.当松弛时间足够短时,气泡长大速度回减慢,而且在后期气泡会发生收缩.气泡初始大小对气泡初始长大过程有影响,但和最终平衡值无关.
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