水力学聚焦微通道中气液两相流动的数值模拟

摘要

The gas-liquid two-phase flow in the hydrodynamically focused microchannels was investigated via computational fluid dynamics (CFD) method. Film was formed in the micro-channels and the film formation process included three stages. Surface pressure, shear stress force and surface tension force were changed during the film formation process. The effects of two-phase pressure change on the two-phase flux and film thickness were investigated. The results of numerical simulation showed that the pressure changing had little influence with constant two-phase pressure ratio at 1, while changing the ratio showed the significant influence.%采用计算流体力学方法,考察了水力学聚焦微通道中气、液两相的流动状态.气、液两相在微通道中呈膜状流动,成膜过程可划分为 3 个阶段,液相表面压力、黏性力和表面张力在该过程中不断变化.考察了两相入口压强对两相流量和膜厚的影响,模拟结果显示:保持两相压强比值不变,同时改变两相压强,影响不显著;改变两相压强比值,影响显著.