窄矩形通道内两相流动压降特性研究

以空气和水为实验工质，分别在40mm×1.6mm和40mm×3mm的矩形通道中对竖直向上气-液两相流动阻力特性进行了实验研究。该研究还对比了现有的两相流动阻力计算关系式，结果表明，对于窄缝为1.6mm的通道，传统的阻力计算关系式均不适用；而窄缝为3mm的通道，除Friedel模型和Tran模型外，其余模型与实验值符合较好。为此结合实验数据，以分液相雷诺数为依据将流动分为层流区、过渡区和湍流区3个区域，分别对Chisholm关系式进行修正，结果表明：C为当量直径的线性函数，当量直径越大，C越小。修正关系式与实验数据的误差较小，能很好地预测本次实验结果。

Resistance Characteristics of Two-Phase Flow Through Narrow Rectangular Duct

Two-phase frictional pressure drop gradients of air-water mixture were studied in two vertical narrow rectangular ducts (40 mm×1.6 mm and 40 mm×3 mm). The experimental results show that the conventional correlations fail to predict the two-phase flow pressure drop in narrow rectangular duct with the 1.6 mm gap, but can predict the two-phase pressure gradient satisfactorily in rectangular duct with 3 mm gap except Friedel model and Tran model. Different modified Chisholm correlations were proposed in two regions which were distinguished by the liquid Reyonlds number. The results show that the constant C has a linear relationship with the hydraulic diameter, and C decreases with the increase of the hydraulic diameter. The new correlations gave accurate predictions of the pressure drop.