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微液膜动力学特性与稳定性实验研究
引用本文:李华,张友佳,张林,黄洪文. 微液膜动力学特性与稳定性实验研究[J]. 强激光与粒子束, 2015, 27(8): 086003. DOI: 10.11884/HPLPB201527.086003
作者姓名:李华  张友佳  张林  黄洪文
作者单位:1.中国核动力研究设计院 反应堆系统设计技术国家重点实验室, 成都 61 021 3;
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。

关 键 词:共轭光学探测器   微液膜   动力学   稳定性
收稿时间:2015-04-28

Experimental research on dynamics and stability of liquid film flow by confocal microscopy
Affiliation:1.National Key Laboratory of Reactor System Design Technology,Nuclear Power Institute of China,Chengdu 610213,China;2.CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology,Nuclear Power Institute of China,Chengdu 610213,China;3.Institute of Nuclear Physics and Chemistry,CAEP,Mianyang 621900,China
Abstract: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, a profile 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.
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