Abstract: The effects of microchannel inlet configuration, gas-liquid flow ratio and two-phase mixture velocity on Taylor bubble formation were investigated via computational fluid dynamics (CFD) method, and the simulated values were in good agreement with the visualization experimental results. Compared with the volume of fluid method (VOF),the coupled level set and volume of fluid method (CLSVOF) could get a more accurate gas-liquid interface, and the bubbles obtained by the CLSVOF method were more consistent with the experimental measurements. The results of numerical simulation showed that microchannel inlet configuration and gas-liquid flow ratio had a great influence on bubble length, bubble generation frequency and bubble volume. For the same gas-liquid flow ratio and different inlet configurations, two-phase mixture velocity had different effects on bubble length.

Key words: Taylor flow, two-phase flow, CFD, microchannels, microreactor, inlet configuration

摘要： 采用计算流体力学方法，考察了微通道入口结构、气液比及两相混合速度对Taylor气泡形成过程的影响，模拟结果与可视化实验符合良好。与单纯流体体积法相比，水平集法（level set）和流体体积法（volume of fluid）相耦合的方法（coupled level set and volume of fluid method，CLSVOF）可获得更精确的气液界面，且CLSVOF法结果与实验结果更符合。数值模拟结果发现，通道入口结构及气液比对气泡长度、气泡生成频率及气泡体积有很大影响。气液比恒定，不同通道入口结构，两相混合速度对气泡长度有不同影响。

关键词: 泰勒流, 两相流, 计算流体力学, 微通道, 微反应器, 入口结构