Abstract
Intermittent gas-liquid flow with an unsteady, intermittent and high-pressure drop nature is common in vacuum transport pipelines. The characteristics of intermittent flow in vacuum pipelines were analyzed. A one-dimensional transient hydrodynamic model for two-phase transport of vacuum pipelines, which consists of the film model, the liquid slug model and the mix vortex model was deduced for the first time. The model outlines the relationship between hydrodynamic parameters and presents the calculation method of pressure drop, which would be helpful to uncover the transport mechanism of vacuum pipelines and propose a more seemly system design and simulation method for availability, reliability and energy-saving considerations.
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