Abstract
Abstract This paper describes a model of the unsteady filling process that occurs when liquid entraps air in sealed lank vented by a vertical round tube. A mathematical model is developed to predict the pressure fluctuation of the closed tank and the rate of transfer of liquid into the tank. A drift-flux model is used to describe the two-phase effects in the tube with particular attention being focused on the boundary condition at the bottom of the tube. The experimental setup consists of flow of water from a constant head reservoir into a sealed tank through a single vertical tube. The pressure in the sealed tank is measured using a pressure transducer. Experiments are run with tubes of varying diameter and lengths. The agreement of the theoretical model with the experimentally measured pressure fluctuation is quite good.
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