| 引用本文: | 严庆光,范金,宋维平.微孔发泡气泡非等温长大过程的数值模拟[J].材料科学与工艺,2013,21(3):74-79.DOI:10.11951/j.issn.1005-0299.20130312. |
| YAN Qing-guang,FAN Jin,SONG Wei-ping.Numerical simulation of non-isothermal bubble growth in microcellular foam[J].Materials Science and Technology,2013,21(3):74-79.DOI:10.11951/j.issn.1005-0299.20130312. |
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| 摘要: |
| 针对微孔发泡气泡非等温长大过程,以PS/C02系统为例,考虑了温度对聚合物流变性质、亨利常数、扩散系数、表面张力的影响,基于细胞模型建立气泡非等温长大问题的数学模型,研究非等温条件下气泡长大情况的变化和不同工艺参数对气泡长大的影响.结果表明：冷却过程中亨利系数的增大和扩散系数的减小是导致气泡长大速度降低的主要因素；增加冷却速度是获得具有高密度、小尺寸泡孔形态微孔塑料的有效手段.这为微孔发泡气泡长大过程的控制提供了一定的理论依据. |
| 关键词: 泡沫塑料 微孔发泡 气泡长大 非等温长大 数值模拟 机理 |
| DOI：10.11951/j.issn.1005-0299.20130312 |
| 分类号: |
| 基金项目:吉林省人才资助项目(20102048)；吉林大学基本科研业务费项目(20090312). |
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| Numerical simulation of non-isothermal bubble growth in microcellular foam |
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YAN Qing-guang1,FAN Jin1,SONG Wei-ping2
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(1.College of Materials Science and Engineering, Jilin University, Changchun 130022, China;2.Jilin Institute of Architectureand Civil Engineering, Changchun 130118, China)
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| Abstract: |
| For the non-isothermal bubble growth in microcellular foam, a mathematical model based on the cell model is established. The model takes into account the effect of temperature on the rheological properties of the polymer-gas melt, Henry’s law constant, diffusion coefficient and surface tension. A PS/CO2 system is used herein as a case example to investigate the change of bubble growth behavior under non-isothermal circumstances and the effects of different processing parameters on bubble growth. The results demonstrate that the main reasons to hinder the bubble growth are the increase of Henry’s law constant and the decrease of diffusion coefficient during the cooling process. Increasing the cooling rate is an effective way to produce microcellular plastics with high bubble density and finer bubble size. These results provide a theoretical basis for the controlling of bubble growth in microcellular foam. |
| Key words: foam plastics microcellular foam bubble growth non-isothermal bubble growth numerical simulation mechanism |
