窄通道流动沸腾换热特性实验研究

以40 mm×2 mm窄矩形通道中流动沸腾换热实验数据为基础，分析影响充分发展沸腾起始（FDB）点位置及换热系数的主要因素，并将实验值和计算值进行对比。FDB点实验值与Bowring模型和Saha-Zuber模型的计算值符合良好，相对误差在20%以内。将实验得到的窄矩形通道换热系数与Chen公式、Gungor-Winterton关系式和Sun Licheng关系式的计算值进行比较，结果表明：应用在常规通道的Chen关系式已不再适用于窄矩形通道传热系数的计算，而考虑窄通道尺寸效应并认为热流密度在饱和沸腾中起主要作用的Sun Licheng关系式与实验值较接近，相对误差在30%以内。

Experimental Research of Flow Boiling Heat Transfer Characteristics in Narrow Channel

Based on the experimental data of boiling heat transfer in narrow rectangular channel with a cross section of 40 mm×2 mm, the main factors that impact the position of fully developed boiling (FDB) and boiling heat transfer coefficient were analyzed, then the experimental data and the calculated values were compared. The position of FDB obtained by experiment agrees well with the value predicted by Bowring correlation and Saha-Zuber correlation, and the relative deviation is within 20%. The boiling heat transfer coefficient acquired by experiment in narrow rectangular channel was compared with Chen correlation, Gungor-Winterton correlation and Sun Licheng correlation. The results indicate that the Chen correlation applied to conventional channel is not suitable for predicting the boiling heat transfer coefficient in narrow rectangular channel. While the Sun Licheng correlation considering the effect of narrow channel size and regarding the heat flux as the main function in boiling heat transfer can predict the experimental results well, and the relative deviation of the correlation and experiment is within 30%.