Water film covering characteristic on horizontal fuel rod under impinging cooling condition

Zhang Penghui; Wang Bowei; Chen Ronghua; Su G.H.; Tian Wenxi; Qiu Suizheng

doi:10.1016/j.net.2022.06.027

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자료유형: 학술저널

저자정보: Zhang Penghui (Xi'an Jiaotong University) Wang Bowei (Xi'an Jiaotong University) Chen Ronghua (Xi'an Jiaotong University) Su G.H. (Xi'an Jiaotong University) Tian Wenxi (Xi'an Jiaotong University) Qiu Suizheng (Xi'an Jiaotong University)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제54권 제11호

발행연도: 2022.11

수록면: 4,329 - 4,337 (9page)

DOI: 10.1016/j.net.2022.06.027

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Jet impinging device is designed for decay heat removal on horizontal fuel rods in a low temperature heating reactor. An experimental system with a fuel rod simulator is established and experiments are performed to evaluate water film covering capacity, within 0.0287e0.0444 kg/ms mass flow rate, 0 e164.1 kW/m2 heating flux and 13.8e91.4 C feeding water temperature. An effective method to obtain the film coverage rate by infrared equipment is proposed. Water film flowing patterns are recoded and the film coverage rates at different circumference angles are measured. It is found the film coverage rate decreases with heating flux during single-phase convection, while increases after onset of nucleate boiling. Besides, film coverage rate is found affected by Marangoni effect and film accelerating effect, and surface wetting is significantly facilitated by bubble behavior. Based on the observed phenomenon and physical mechanism, dry-out depth and initial dry-out rate are proposed to evaluate film covering potential on a heating surface. A model to predict film coverage rate is proposed based on the data. The findings would have reliable guide and important implications for further evaluation and design of decay heat removal system of new reactors, and could be helpful for passive containment cooling research.

#Fuel cooling #Falling film #Film coverage rate #Dry-out

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