摘要
以氮气和水为工作流体,在矩形截面为100μm×800μm的T型微通道内进行了气液两相流可视化实验,观测到弹状流、弹状-液环流、环状流、分层流和搅拌流,得到了流型图和流型转换界限。通过对比对弹状流、环状流和分层流相分离实验结果,证明在T型微通道内气液两相流相分离特性受上游流型影响。上游流型为弹状流时,气体优先从侧支管采出;上游流型为环状流时,液体优先从侧支管采出;上游流型为分层流时,气体只从其中一条支管中采出。当流型一定时,液相采出分率随着入口液体速率增加而减小,而气体速率变化对液相采出分率影响不大。
With nitrogen gas and water as working fluid, visualization experiments was carded out to study the characteristics of the two-phase flow in a micro-T-junction with a micro-channel cross section of 100μmx800μm. Slug flow, slug-annular flow, annular flow, stratified flow and chum flow were observed, and the flow pattern map and flow pattern transition boundaries were obtained. By comparing the results of slug, annular and stratified flow, it was showm that the phase splitting characteristics of the two-phase flow in a micro-T-junction was highly dependent on the inlet flow pattern. When the inlet flow was slug, the gas preferentially entered the side branch; when the inlet flow was annular, the liquid preferentially entered the side branch; when the inlet flow was stratified, the gas completely entered to one branch. The effect of velocity on the phase splitting for all flow patterns was： the liquid taken off decreased with the increase of liquid flow rate, and there was very little effect of the inlet gas flow rate on the liquid take off.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2012年第4期300-305,共6页
Chemical Reaction Engineering and Technology
关键词
T型微通道
气液两相流
流型
相分离
micro-T-junction
gas-liquid two-phase flow
flow pattern
phase splitting
