Abstract
In the present work, the transient liquid velocity in hilly-terrain pipelines is experimentally and numerically investigated through ultrasonic Doppler technique and CLSVOF method. An ultrasonic transducer mounted on upward inclined pipeline is employed for transient liquid velocity measurement, and the results agree well with simulations. It is found that the slug flow is only presented in the inclined pipeline. The superficial gas and liquid velocity has a significant influence on the slug frequency while it has a slight influence on the slug translational velocity.
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