摘要
分析了微尺度下熔体壁面滑移机理,研究了微注塑成形中壁面滑移对熔体充模流动行为的影响。利用有限元方法进行数值模拟,确定了不同特征尺寸微通道中熔体的滑移系数,分析了入口剪切速率和长径比与滑移速度之间的关系。研究结果表明:壁面滑移使熔体速度曲线趋于平滑;当熔体入口速率一定时,其壁面滑移速度随微通道特征尺寸的减小而减小;入口剪切应力相同时,壁面滑移速度随微通道的长径比的增大而增大。
Based on the analyses of wall slip mechanism of polymer melt flowing, the effects of wall slip on melt filling flow behavior in micro injection molding were investigated. With finite element method, the relationship between slip speed and inlet flow rate or length-diameter ratio was analyzed,the slip coefficients of polymer melt in microchannels were confirmed. The results show that wall slip makes melt velocity curve smooth. At a certain inlet speed,melt wall slip velocity is reduced with the decrease of the microchannel section dimension, and at the same inlet shear stress,melt wall slip velocity rises with increase of length-diameter ratio of the microchannel.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2007年第16期1995-1999,共5页
China Mechanical Engineering
基金
国家自然科学基金资助项目(50275020)
"十一五"国家科技支撑计划资助重点项目(2006BAF04B13)
关键词
微注塑成形
充模流动
壁面滑移
数值模拟
micro injection molding
filling flow
wall slip
numerical simulation
