矩形通道内气水两相流摩擦阻力计算模型

常压下以空气和去离子水为工质，对横截面为1.41 mm×40 mm和3 mm×40 mm的竖直矩形通道内两相流动阻力特性进行了实验研究。利用获得的764组实验数据，对11种典型两相流摩擦阻力计算模型进行评价。结果表明：Lee-Lee模型整体预测精度最高，但在分液相雷诺数较小（Re_l<600）和较大（Re_l>8 700）区域，与实验值符合较差；在分液相紊流区(Re_l≥2 000) Chisholm B模型适用性较好，对于两实验段预测值与实验值绝对平均误差分别为6.13%和6.43%，但在分液相层流区(Re_l<2 000)其预测值与实验值偏差较大。根据压降特性提出修正两相动力黏度，并针对分液相层流区提出修正计算关系式，其预测值与实验值符合较好。

Model for Calculating Frictional Resistance of Air-water Two-phase Flow in Rectangular Channels

The frictional resistance characteristics of air-deionized water two-phase flow in two vertical rectangular channels with respective cross sections of 1.41 mm×40 mm and 3 mm×40 mm were experimentally studied under atmospheric pressure condition. Eleven classical two-phase flow frictional resistance models were assessed with the acquired 764 data sets. The results show that Lee-Lee model fits well with the data, but there still exists relatively large deviations in high (Re_l>8 700) and low (Re_l<600) liquid Reynolds number regions. In the liquid turbulent region (Re_l≥2 000) the most accurate model is Chisholm B model with the mean absolute errors of 6.13% and 6.43% for the two channels respectively, which however predicts the frictional pressure drop in the liquid laminar region (Re_l<2 000) with large deviations compared to experimental data. The modification to two phase dynamic viscosity is implemented according to the flow resistance characteristics and a modified correlation is proposed for the liquid laminar region, with which the predicted results show a good agreement with the experimental data.