The corrugated plate dryer is an important steam-water separation device in the steam generator in the secondary loop of a light water reactor. It is essential to understand its steam-water separation mechanism. Most studies have shown that the separation efficiency of the corrugated plate is related to the thickness of the liquid film on the wall of the corrugated plate. We have studied the relationship between the thickness of the liquid film and the critical airflow velocity of the corrugated plate. At present, scholars mostly use the image method, ultrasonic method, and capacitance method to measure the thickness of thin liquid film. We have analyzed the application of these three methods in liquid film thickness measurement. Some important examples are listed. The results show that the capacitance method is recommended for liquid film thickness measurement experiments, whereas its accuracy is not particularly high. To pursue the higher accuracy, the image method is recommended. Planar laser-induced fluorescence (PLIF) technology is the first choice among image methods. The ultrasonic method is applicable in the case that the measurement data are large.

波纹板式干燥机是轻水反应器二级回路中蒸汽发生器中重要的蒸汽-水分离装置。了解其蒸汽-水分离机理至关重要。大多数研究表明，瓦楞板的分离效率与瓦楞板壁上液膜的厚度有关。我们已经研究了液膜的厚度和波纹板的临界气流速度之间的关系。目前，学者们大多使用成像法，超声法和电容法来测量薄膜的厚度。我们分析了这三种方法在液膜厚度测量中的应用。列出了一些重要的例子。结果表明，电容法推荐用于液膜厚度测量实验，但其准确性不是很高。为了追求更高的精度，建议使用图像方法。平面激光诱导荧光（PLIF）技术是图像方法中的首选。超声波方法适用于测量数据较大的情况。