In liquid pipelines, fluctuations in flow velocities and sudden pressure drops can allow the hydraulic pressure to drop below the vapor pressure. This leads to the formation of transient vapor cavities which negatively impact the performance of the pipeline and can damage the equipment that controls the pipeline. This article discusses the details of a method that determines the influence vaporous cavitation has on the performance of the pipeline. The method employs the use of multiphase approximations, like the Beggs-Brill method, and gas/liquid equilibrium calculations to identify regions where vapor cavities can form and to accurately determine the changes of the pressure, temperature, and mass flow rate at those regions.

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