液体填塞流的持液率与压力降研究

以不同粘度的流体为液相，在垂直管中研究了液体填塞流（包括弹状流，块状流和泛出流）的持液率和压力降，研究结果表明，对于不同粘度的液体，填塞流的持液率都随无量纲气流体积通量的增大呈对数规律减小，总压力降随气流体积通量也近似呈对数规律变化，研究同时发现，液体填塞流的摩擦阻力压力降为负值且存在极值点，摩擦阻力压力降在总压力降中所占的百分比与气流体积通量的关系存在拐点，拐点处在应于弹状流向块状流的流型转变。

Holdup and Pressure Drop in Liquid-Loading Gas-Liquid Flow

Liquid loading flow is a particular case of two phase upward flow. Holdup and pressure drop of liquid loading flow (including slug flow,churn flow and blowout) were investigated in a vertical tube, using different fluids as liquid phase. Experimental data show that for different fluids the liquid holdup in liquid loading flow decreases logarithmically with the increase of the non dimensionless gas flux defined as the ratio of gas flux to critical flux. The total pressure drop also varies logarithmically with gas flux. Meanwhile, it was found that the frictional pressure drop of liquid loading flow is negative and has a minimum value. The relationship curve, which is of the gas flux and the ratio of frictional pressure drop to total pressure drop, has inflexion point. This inflexion corresponds to the transition from slug flow to churn flow.