Enhancement of critical heat flux under subcooled boiling of deionized water in a curved flow channel

2019 International Conference on Advances in Materials, Mechanical and Manufacturing

材料科学;机械制造

Urfa, Rasool^1 ; Lu, Daogang^1 ; Asran, Noor Farooq^2 ; Munib, Ansari^1 ; Aazim, Rasool^1

Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy, North China Electric Power University, Beijing

102206, China^1

Pakistan Institute of Engineering and Applied Sciences, Pakistan^2

关键词: Critical heat flux(CHF);    Flow channels;    Heating surfaces;    High flow velocity;    Numerical calculation;    Square cross section;    Sub-cooled boiling;    Subcooled liquid;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/576/1/012046/pdf
DOI  :  10.1088/1757-899X/576/1/012046

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The numerical calculations are performed to predict critical heat flux (CHF) during subcooled boiling of deionized water through 90° curved flow channel with square cross-section. Two types of flow regimes have been observed at low and high flow velocities. In case of low flow velocities, the continuous accumulation of vapors formed a vapor blanket on heating surface which consequently reduced heat dissipation out of the surface and triggered CHF due to drying out of liquid between vapor blanket and heating wall. On the other hand, coolant circulation at higher velocities hindered the formation of vapor blanket and allowed subcooled liquid for rewetting. The consistent rewetting led the formation of small and separate vapor blankets. The enhancement in CHF has been observed with increased degree of subcooling and by increasing flow velocity in present study.