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,但是仍无法精确地描述并联扩缩微通道内氮气/水气液两相的运动与空间分布.
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.
出处
《北京工业大学学报》
CAS
CSCD
北大核心
2014年第1期85-90,共6页
Journal of Beijing University of Technology
基金
国家自然科学基金资助项目(51176002)
国家重点基础研究发展计划资助项目(2011CB710704)
关键词
扩缩
微通道
两相流
压降
expansion-constriction
microchannel
two-phase flow
pressure drop