摘要
气-液两相流设备的性能受限于临界热流密度,开展流动微液膜动力学特性及其稳定性的相关研究是深入理解沸腾危机及临界热流密度机理的关键。采用光学玻璃制成的矩形通道作为实验段,使用微流量齿轮泵驱动去离子水,使其在实验通道入口处与在其上部流动的压缩空气接触形成同向流动的分层流。利用共轭光学探测器对流动微液膜的厚度进行了测量,利用高速摄像机对气-液两相分层流波动特性进行了可视化观测。研究表明,在绝热情况下,当液速一定时,液膜的平均厚度随着气速增加而减小,当气速增加到某一阈值时会导致液膜破裂。
The performance of boiling devices is limited by boiling crisis（burnout and dryout）characterized by the critical heat flux（CHF）.The implementation of some related study is a key step for deeply understanding the mechanism of CHF and its enhancement.This experimental study is concerned with the dynamics and stability of liquid film flow under adiabatic condition,which plays an important role in understanding film rupture and dryout in boiling heat transfer.The rectangular test channel is made of optical glass.A stratified flow is formed in channel by supplying de-ionized water and air to the inlet of test section separately,with water flowing along the bottom surface while air flowing above the liquid film.A confocal microscopy is applied to acquire the evolution of the liquid film thickness,and a high-speed camera is employed to record the film dynamics.Based on the experimental data,aprofile of liquid film thickness is obtained along the test channel.It is found that given a constant water flow rate,the mean thickness of the liquid film decreases with increasing the air flow rate.As the air flow rate reaches a critical value,a localized rupture of the liquid film occurs.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2015年第8期271-274,共4页
High Power Laser and Particle Beams
关键词
共轭光学探测器
微液膜
动力学
稳定性
confocal microscopy
micro-liquid film
dynamics
stability
作者简介
李华（1984-），女，博士，从事核反应堆燃料组件设计及热工水力研究；huali．npic@hotmail．com。
通信作者：黄洪文（1975-），男，博士，从事反应堆热工水力相关研究；hhw@caep．cn。
