利用电容层析成像方法，实现脉动热管内微尺度两相流的可视化监测及液膜厚度的测量。优化设计的微型传感器也可作为流动管道，具有和测量管道基本相同的传热和流动特性。相比普通电容层析成像传感器，其测量精度和空间分辨率都有一定提高，从而拓宽了电容层析成像技术的应用范围。实验结果表明：不同工作条件下，脉动热管存在塞状流、环状流以及混合流3种不同的流型；液膜厚度测量结果与实际相符，通过其变化趋势可以实现流型的识别。

The electrical capacitance tomography (ECT) system was used to the visualization of the two-phase flow as well as the measurement of the film thickness in a pulsating heat pipe (PHP). The new-developed micro-sensor was also applied as a part of the flow channel, with the characteristics of heat transfer and hydrodynamics similar to the measured tube. The measurement accuracy and the image resolving power were improved as compared with the conventional sensors. So the applied area of the ECT technology was widened. The experimental results indicate that there might exist three flow patterns, i.e. bubble-liquid slug flow, semi-annular flow and annular flow, corresponding to different operating conditions. The measurement results of the film thickness compare well with the actual conditions, and the trend of the film thickness can realize the identification of the flow patterns.

国家自然科学基金项目(50736002)；长江学者和创新团队发展计划资助(IRT0720)。