并联硅基扩缩微通道内气液两相间歇流型与压降特性  

Intermittent Flow Pattern and Pressure Drop for Two-phase Flow in Parallel Microchannels With Expansion-constriction Cross Sections

作　　者：柴磊[1,2] 夏国栋[1] 李健[1] 周明正[1,3] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100124 [2]中国科学院工程热物理研究所,北京100190 [3]国家核电技术研发中心,北京100190

出　　处：《北京工业大学学报》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)

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.

关 键 词：扩缩 微通道 两相流 压降 

分 类 号：Q359.1[生物学—遗传学]