蛇形微通道气液两相流型的数值研究

Numerical Simulation on Flow Pattern of Gas-Liquid Two-Phase Flow in Serpentine Micro-Channel

采用CLSVOF(coupled level set and volume of fluid)方法,以空气和水为介质对矩形截面蛇形微通道内气液两相流动进行模拟研究。验证模型的合理性后,系统地研究了表面张力,液相黏度,壁面接触角及通道截面形状对蛇形微通道内不同流型间转换界限的影响,并绘制了不同表面张力、液相黏度及接触角下的流型图。最后,将计算结果与相同当量直径不同截面微通道内两相流流型图进行对比,分析截面形状及高宽比对流型间转换界限的影响。这些基本规律为微通道的系统设计提供了一定依据。

A numerical analysis of flow patterns in serpentine micro-channels was studied using a CLSVOF（coupled level set and volume of fluid method） multiphase model. The effect of contact angle, surface tension,liquid viscosity and cross section shape on flow pattern was systematically investigated after verifying therationality of the model. The air-water two-phase flow pattern map was drafted under different flow conditions.Moreover, in order to analyze the effect of section shape and aspect ratio on flow pattern, the flow map betweensimulation results and different sections with same equivalent diameter micro-channels was compared. Theseresults provide a basic idea for micro-channel design.