材料工程2024，Vol.52Issue(8)：212-218,7.DOI:10.11868/j.issn.1001-4381.2023.000453
微尺度下基于对流混合的充填不平衡影响因素数值模拟分析
Numerical simulation analysis of factors affecting filling unbalance based on convective mixing at microscale
摘要
Abstract
Aiming at the new control method of filling unbalance in the flow channel by using convection mixing,the influence of micro-scale polymer melt flow factors on the control characteristics of melt temperature distribution in the flow channel was studied by numerical simulation. Taking the "H" flow channel as the research object,the convection mixing device was arranged in the flow channel. The effects of melt temperature,convective heat transfer coefficient and flow channel size on melt filling unbalance were studied by single factor experiment. The numerical simulation results show that,the increase in melt temperature is accompanied by the decrease of melt self-viscosity under adiabatic boundary conditions. The temperature difference between symmetric points decreases,which improves the filling imbalance. Under the convective heat transfer boundary,the increase of melt temperature increases the heat loss of melt through the wall,and the increase of temperature difference between symmetric points leads to the more obvious filling imbalance. The lower the convective heat transfer coefficient,the lower the thermal conductivity efficiency between melt and wall,and the higher the average melt temperature,which increases the temperature difference between symmetric points and intensifies the filling imbalance. With the decrease in the size of the flow path,the micro-scale effect is weakened,the temperature difference between symmetric points can be reduced,and the phenomenon of filling imbalance is better improved. The convective heat transfer coefficient has the greatest influence on the filling unbalance,followed by the flow channel size,and finally the melt temperature.关键词
对流混合/熔体温度/对流换热系数/流道系统/充填不平衡Key words
convective mixing/melt temperature/convective heat transfer coefficient/runner system/unbalance of packing分类
矿业与冶金引用本文复制引用
刘洋,徐斌,王邱宇,杜洋..微尺度下基于对流混合的充填不平衡影响因素数值模拟分析[J].材料工程,2024,52(8):212-218,7.基金项目
国家自然科学基金项目(51475395) （51475395）
