Corrugated plate dryer is an important steam-water separation equipment in steam generator of secondary loop of nuclear power plant. Its steam-water separation efficiency has a certain influence on economic index of nuclear power plants. It is meaningful to understand flow characteristics of liquid film on corrugated plate wall. Besides, the fluctuation of the liquid film may cause the occurrence of liquid film rupture, thus the research on the fluctuation of the liquid film on the wall of the corrugated plate is very important. This paper uses Plane laser induced fluorescence (PLIF) method to measure liquid film thickness. Curve of film thickness with time is obtained. Calculation formula of average value of liquid film thickness is given. Based on power spectral density (PSD) method, non-linear characteristics of liquid film thickness are studied. Results show that the relationship between film thickness and Reynolds number conforms to Nusselt theory. Nevertheless, the results show deviation from Nusselt as well as Karapantsios estimation. When Reynolds number is in the range of 600 to 3000 and surface roughness is 0.03, the fluctuation of the power spectrum of the liquid film thickness caused by gravity can be ignored, which provides a reference for study on steam-water separation.

波纹板干燥机是核电站二次回路蒸汽发生器中重要的汽水分离设备。其汽水分离效率对核电厂的经济指标有一定影响。了解波纹板壁上液膜的流动特性是有意义的。另外，液膜的起伏可能引起液膜破裂的发生，因此对瓦楞板壁上液膜起伏的研究非常重要。本文采用平面激光诱导荧光（PLIF）法测量液膜厚度。得到膜厚度随时间的曲线。给出了液膜厚度平均值的计算公式。基于功率谱密度（PSD）方法，研究了液膜厚度的非线性特性。结果表明，膜厚与雷诺数之间的关系符合Nusselt理论。但是，结果显示与Nusselt以及Karapantsios估计值存在偏差。当雷诺数在600到3000之间且表面粗糙度为0.03时，可以忽略由于重力引起的液膜厚度功率谱的波动，这为蒸汽水分离的研究提供了参考。