中文摘要：

采用以IDT高速摄像仪和Nikon生物显微镜为主体的可视化观测系统，实验研究并联硅基扩缩微通道内氮气／水气液两相间歇流型及压降特性．随气液两相表观流速变化，间歇流子流型依次呈现环状／单相液体交替流型、弹状／环状／单相液体交替流型、弹状／单相液体交替流型、雾状／弹状／单相液体交替流型和雾状／单相液体交替流型，得到不同气液两相表观流速下并联扩缩微通道流型分布图．研究表明，均相流模型的压降计算结果同实验值有较大出入．尽管分相流模型在一定程度上引入了气液两相的相互作用，其预测结果好于均相流模型，但是仍无法

英文摘要：

The gas-liquid two-phase intermittent flow pattern and pressure drop characteristics in parallel mieroehannels with expansion-constriction cross sections were investigated experimentally by means of the IDT high-speed camera mounted together with a Nikon microscope. The results showed that, with the change of the gas-liquid two-phase superficial velocity, the annular/liquid alternating flow pattern, the slug/annular/liquid alternating flow pattern, the slug/liquid alternating flow pattern, mist/slug/liquid alternating flow pattern and mist/liquid alternating flow pattern presented in turn. The two-phase flow regime maps for the parallel mierochannels with expansion-constriction cross sections were obtained. The homogeneous flow model cannot predict the two-phase pressure drop data. Despite the separated flow model introducing the gas-liquid two-phase interaction to a certain extent, the gas-liquid two-phase movement and space distribution in the parallel microchannels with periodic expansion-constriction cross sections cannot be predicted accurately.