Experimental study of slug flow characterization in a downward inclined pipeline

In order to find out flow characteristics of slug flow in downward inclined pipeline,the experimental investigation was carried out using the loop of 50 mm in diameter and 27.43 m in length.The rule of characteristic parameters of slug flow in downward inclined pipeline was disclosed using cross-correlation method of differential pressure signals.With the increase of mixture velocity,liquid slug velocity does not increase linearly and is insensitive to downward inclination angle.Mean liquid slug length decreases firstly but next increases as the mixture velocity increases,and no clear tendency can be showed with changes of inclination angle.With Froude number more than 16,the downward inclination angle influences slightly on the max liquid slug length. Liquid slug frequency increases linearly with the increase of liquid superficial velocity and gas superficial velocity,and liquid superficial velocity has larger influence on the liquid slug frequency than gas superficial velocity.