小长径比组合立管的液塞耗散作用

Slug dissipation in combined riser pipe with small length-diameter ratio

试验研究了小长径比组合立管的液塞耗散作用,分析了组合立管进出口持液率、液塞频率及液塞长度的变化规律。结果表明:组合立管中的扩径管使出口段液膜区与液塞区的持液率均小于入口段,出口段液塞区随折算气速增加而减小直至消失,而随折算液速的增加变化不大;液塞频率变化率随折算气速增加而增大;在中低气速下,液塞频率变化率随折算液速增加而增大,在高气速下,液塞频率变化率先稳定在最大值而后又下降;液塞长度变化率随折算气速增加而增大,在最低与最高气速下,液塞长度变化率随折算液速增加先稳定后减小,在中等气速下,液塞长度变化率稳定在0.6附近。

The experiments about holdup, slug frequency and slug length were carried in combined riser pipe with small length-diameter ratio. The results show that by increasing the pipe diameter, the holdup of liquid slug region and film region at outlet is lower than that at inlet. With the increasing of gas superficial velocity, the liquid slug region decreases and disappears. The change of liquid slug region is small as the liquid superficial velocity increases. The change rates of slug frequency increase as the gas superficial velocity increases. At h）w-medium gas superficial velocity, the change rates of slug frequency increase as the liquid superficial velocity increases. But the change rate of slug frequency remains at maximum before decreasing at higher gas superficial velocity. The change rates of liquid slug length increase as the gas superficial velocity increases, and remain at maximum before decreasing at the lowest and highest gas superficial velocity, and remain at around 0. 6 at the medium gas superficial velocity.