关键词:

气辅, 两相流, Level Set, 界面

Abstract:

The mathematical models of gas-liquid two-phase flow were presented, and the Cross-WLF model was selected as the viscosity model of the melt.The gas penetration process was simulated by using the Level Set /SIMPLEC methods, which could capture the moving interfaces at different times, including the gas-melt interface and the front of the melt.The physical features, such as velocity and temperature at different times were described.The influences of melt temperature, gas delay time and injection pressure on gas penetration time and penetration length were analyzed.The numerical results showed that the Level Set/SIMPLEC methods could precisely trace the two moving interfaces in the gas penetration process and the penetration length was affected significantly by melt temperature, gas delay time and injection pressure.

Key words:

气辅, 两相流, Level Set, 界面