环形通道内钠流动起始沸腾壁面过热度实验研究

Experimental Study on Incipient Boiling Wall Superheat of Sodium Flowing in Annulus

对环形通道内金属钠起始沸腾壁面过热度进行实验研究。实验段长800 mm ，环形通道外径10 mm ，内径6 mm。电加热元件最高热流密度为846 kW/m2，进口过冷度为63.1～287.8℃，质量流量为7.2～122.0 kg/h ，系统压力为0.85～28.79 kPa。实验结果表明，起始沸腾壁面过热度随热流密度和进口过冷度的增加而升高，随质量流量和系统压力的增加而降低。拟合得到了关于起始沸腾壁面过热度的半经验关系式，关系式计算结果与实验数据符合良好。

The incipient boiling wall superheat of sodium flowing in annulus was experi-mentally investigated .The annulus is the length of 800 mm ,the inside diameter of 6 mm and the outside diameter of 10 mm .Experimental conditions are that the heat flux is 128-846 kW/m2 ,the inlet subcooling is 63.1-287.8 ℃ ,the mass flow rate is 7.2-122.0 kg/h and the system pressure is 0.85-28.79 kPa . The experimental results indicate that the incipient boiling wall superheat increases with the heat flux and the inlet subcooling ,and reduces with the increase of the mass flow rate and the system pressure . A semi-empirical correlation was gained from experimental results . The predicting results agree well with experimental data .