Experiment and Numerical Simulation of Non-Isothermal Bubble Growth in Polymer Foaming

2018 5th International Conference on Advanced Engineering and Technology

工业技术（总论）

Yan, Qingguang^1 ; Wang, Huifang^1 ; Li, Rui^1 ; Huang, Dongdi^1 ; Han, Xiao^1

College of Materials Science and Engineering, Jilin University, Changchun

130022, China^1

关键词: Bubble density;    Cooling process;    Diffusion equations;    Effect of temperature;    Henry's Law constant;    Mass equation;    Momentum equation;    Rheological property;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/507/1/012005/pdf
DOI  :  10.1088/1757-899X/507/1/012005

学科分类：工业工程学

来源: IOP

【 摘 要 】

A numerical simulation for non-isothermal bubble growth in polymer foaming were performed. The mathematical model based on the cell model was established to solve momentum equation, mass equation, diffusion equation and constitutive equation. We assumed the foaming polymer melt cooled at a set rate and took 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 was used herein as a case example to investigate the change of bubble growth behavior under non-isothermal circumstances and the effect of cooling speed on bubble growth. A batch foaming experiment with different cooling patterns was conducted to verify the simulation results. 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. Increase the cooling rate is an effective way to produce foamed plastics with high bubble density and finer bubble size.