以去离子水为工质，对尺寸为720 mm×250 mm×3.5 mm的单面电加热竖直矩形窄通道内饱和沸腾起始点进行实验研究。分析了加热热流密度、工质进口温度和质量流量对饱和沸腾起始点位置及饱和沸腾起始点处壁面过热度的影响。在已有饱和沸腾起始点预测关联式的基础上，对实验数据进行非线性回归分析，得到适用于单面加热矩形窄通道饱和沸腾起始点的新关联式。结果表明：新拟合的关联式预测值与实验值的平均相对误差为17.63%，能很好的预测常压、低加热热流密度与低流速条件下的饱和沸腾起始点处壁面过热度与热流密度的关系。

The deionized water was used as the experimental medium and the starting point of fully developed boiling (FDB) in a single side electrically heated vertical rectangular narrow channel with the size of 720 mm × 250 mm × 3.5 mm was experimentally studied. The effects of heating heat flux, working medium inlet temperature and mass flow rate on the position and wall superheat of FDB starting point were analyzed. Based on the existing prediction correlations of FDB starting point, a new correlation applicable to FDB starting point in a single side heated rectangular narrow channel was obtained through nonlinear regression analysis of the experimental data. The results show that the average relative error between the predicted value of the new fitted correlation and the experimental value is 17.63%, which can well predict the relationship between wall superheat and heat flux at FDB starting point under normal pressure, low heating heat flux and low flow rate.

TK124

上海市动力工程多相流动与传热重点实验室研究项目(2019KJFZ201)