Study on the Breakdown Mechanism of Water Film on Corrugated Plate Wall Under the Horizontal Shear of Airflow: A Short Communication

Bo Wang,Bingzheng Ke,Ruifeng Tian,Bowen Chen,Gongqing Wang,Ru Li,Jiming Wen,Chuan Lu

doi:10.3389/fenrg.2020.00197

Bo Wang, Bingzheng Ke + Show 6 more

Open Access

https://doi.org/10.3389/fenrg.2020.00197

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Abstract

The corrugated plate dryer is an important steam-water separation equipment in the steam generator in the secondary loop of nuclear power plants. Therefore, it is very important to understand the process and mechanism of liquid film rupture on the wall surface of the corrugated plate dryer. In this paper, for the first time, the process of rupture of the liquid film on the surface of the corrugated plate is studied. The mechanism of liquid film rupture on the wall surface of vertical corrugated plate was studied experimentally. The high-speed camera was used to collect the image of the broken liquid film, and the experimental research on the broken position, the broken process and the broken shape of the liquid film was carried out. The results show that the rupture of the liquid film on the wall surface of the corrugated plate under the horizontal shear of air flow mostly occurs at the upper middle position of the main flow of the liquid film. And the rupture position moves up with the increase of the Reynolds number of the liquid film. Liquid film rupture needs to go through the process of stable flow, single strip-shaped liquid film detachment, two strip-shaped liquid film formation, and finally chaotic disordered rupture. The angle between the two strip-shaped liquid films is positively related to the Reynolds number of the liquid film.

Highlights

The corrugated plate dryer (CPD) is an important steam-water separation (SWS) equipment in the steam generator in the secondary loop of nuclear power plants (NPPs; Zhang et al, 2015; Huang et al, 2019; Wang and Tian, 2019a,b,c; Wang et al, 2019; Chen et al, 2020a,b; Fang et al, 2020a,b; Wang et al, 2020a,b,c)
An liquid film rupture (LFR) experiment was conducted on a corrugated plate with a plate spacing of 18.2 mm, height of 250 mm, and folding angle of 33 degrees
liquid film (LF) distributed at the center of CPD will move to the corner under horizontal shear of airflow (HSA) (Figures 2C–E)

Summary

INTRODUCTION

The corrugated plate dryer (CPD) is an important steam-water separation (SWS) equipment in the steam generator in the secondary loop of nuclear power plants (NPPs; Zhang et al, 2015; Huang et al, 2019; Wang and Tian, 2019a,b,c; Wang et al, 2019; Chen et al, 2020a,b; Fang et al, 2020a,b; Wang et al, 2020a,b,c). It is very important to understand the process and mechanism of liquid film rupture (LFR) on the wall surface of the CPD. Zhang et al (2015) studied the fluctuation of the LF on the wall surface of the CPD. The current research shows that there is no characteristic frequency for the volatility of the liquid film on CPD wall. The LF on the wall surface of the CPD under the HSA is taken as a research object to study the shape and process of LFR. A slit method is applied for the generation of a thin LF, that is, a horizontal slit is set on CPD so that the LF flows smoothly on the wall (Wang and Tian, 2019a). For details of the experimental error analysis, image capture method, and PLIF measurement, please refer to the references (Wang and Tian, 2019c; Wang et al, 2020c)

RESULTS AND ANALYSIS

CONCLUSION

DATA AVAILABILITY STATEMENT