Abstract
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 PLIF (Plane laser induced fluorescence) 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, nonlinear 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.
Highlights
The corrugated plate dryer is an important device in the steam generator in the secondary loop of the nuclear power plant (Wang and Tian, 2019a; Wang et al, 2019, 2020a,b)
This shows that the liquid film thickness value does not have fluctuation characteristics
For 20–30 < Re < 1000– 2000, the liquid film is still laminar flow, its surface is no longer smooth. It has a certain degree of fluctuation, which is caused by the superposition of the surface waves of the liquid film
Summary
The corrugated plate dryer is an important device in the steam generator in the secondary loop of the nuclear power plant (Wang and Tian, 2019a; Wang et al, 2019, 2020a,b). Its main parameters are the plate spacing d of the corrugated plate, the folded edge. Flm Flow Fluctuation on CPD length L of the corrugated plate, the height H of the corrugated plate, and the folding angle θ. The main function of the corrugated plate dryer is to dry high-temperature and highpressure steam. It is important to understand the characteristics of liquid film flow and rupture in the corrugated plate dryer (Wang and Tian, 2019b; Chen et al, 2020a,b; Wang et al, 2020c).
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