水平管段塞流持液率的试验统计分析

Statistical analysis about liquid holdup of slug flow in horizontal pipelines

对水平管段塞流持液率进行了试验研究。通过对试验结果的统计分析可以得出:①可以利用段塞流持液率的波动情况来确定液塞频率。②在段塞流动中,当气相折算速度和液相折算速度相差不大时,持液率概率密度函数呈双峰分布;当液相折算速度不变时,随着气相折算速度的增大,持液率概率密度函数第2峰值逐渐减小,直至消失而变为单峰分布;利用这一特征可初步确定段塞流动中气、液相流量相对大小。③折算速度的变化会引起液塞持液率的变化,液塞持液率随气相折算速度的增大而减小,随液相折算速度的增大而增大。

Slug flow in horizontal pipes is experimentally investigated in order to study the characteristics of liquid holdup. Through the statistical analysis of the test results, it was found that we could obtain the liquid slug frequency from the fluctuation of the slug liquid holdup. When gas superficial velocity was about equal to liquid superficial velocity, the probability density function （PDF） of liquid holdup had a twin-peaked, when liquid superficial velocity was constant, one of the peaks would fade out and disappear with the increase of gas superficial velocity. Through using the characteristics, the relative size of gas and liquid superficial velocity can be set initially. Slug liquid holdup would change with the gas or liquid superficial velocity. It would decrease with the increase of gas superficial velocity and increase with the increase of liquid superficial velocity.