气-液两相泡状流在摇摆状态下的摩擦压降计算

Pressure Drop Correlations of Two-Phase Bubble Flow in Rolling Tubes

在常温下对光滑的有机玻璃管内单相水和气-液两相泡状流在两种不同摇摆角度和3种不同摇摆周期下的摩擦压降特性展开了研究。结合实验数据,提出了摇摆状态下的单相水摩阻系数的计算关系式。计算关系式不仅能够反映摩阻系数随时间变化的周期动态特征,而且计算结果与实验结果符合很好。在此基础上,运用均相流模型,对摇摆状态下两相泡状流的摩擦压降进行计算。结果发现,计算值与实验值的相对误差在±25%以内。

A series of experimental studies of frictional pressure drop for single water phase and gas-liquid two-phase bubble flow in two different rolling angles and three different rolling periods were carried out in the paper. Based on the experimental data, a new correlation for calculating single-phase frictional coefficient under rolling condition was presented, and the calculations not only were agreed well with the experimental data, but also could display the periodically dynamic characteristics of frictional coefficients. Applying the homogeneous flow model, two-phase frictional pressure drop of bubble flow in rolling tubes could be caculated, and the results showed that the relative error between the calculation and experimental data was less than ± 25%.