矩形窄通道内流动沸腾阻力实验与计算方法研究

基于换热器小型化的研究背景，对水在矩形窄通道内流动沸腾阻力特性进行了实验研究与分析，并利用实验结果对常规通道和窄通道的两相摩擦压降计算的6种方法进行了评价。结果表明，应用于常规通道的关系式已不适于窄通道中流动沸腾压降的计算，而基于窄通道的Zhang-Mishima及Sun-Mishima关系式预测结果与实验值符合较好。实验结果和理论分析表明，利用分相流方法得到的分液相摩擦因子计算式中Chisholm系数C与Martinelli参数X存在指数关系，且随着质量流速的变化也有所不同，据此给出了新的分液相摩擦因子的计算方法，新方法具有更高的计算精度。

Experimental and Methodological Research on Pressure Drop of Flow Boiling in Narrow Rectangular Channel

On the background of the miniaturization of heat exchanger,experimental investigation and analysis of the pressure drop of flow boiling in narrow rectangular channel were conducted.Six correlations for the two-phase friction pressure drop were evaluated against the experimental data.The results show that the correlations for conventional channel poorly predict the results.While the Sun-Mishima and Zhang-Mishima correlations developed for narrow channel are better than other correlations.In the meantime,the constant C in the Chisholm equation for calculating the two-phase friction pressure drop shows the exponential trend against Martinelli parameter X for different mass fluxes.Therefore,a new correlation was developed for calculating the two-phase frictional multiplier and the evaluation shows that it’s better than the other evaluated correlations.