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Understanding the physical mechanisms of air–water flow in pipelines is essential for optimizing the design of pressurized fluid transport systems. A three-dimensional (3D) computational fluid dynamics (CFD) model has been developed to study pressurized two-phase flow during the emptying of a large-scale pipeline. The focus is on the evolution of the air–water interface and the corresponding reduction in the draining water column length. Existing experimental data, including flow rates, water levels, and pressures, agree well with the 3D CFD results. Discrepancies are mainly attributed to the sensitivity of the 3D CFD model to the pipe’s wall roughness. The relationship between the air–water interface velocity and the outlet flow velocity aligns with the principles of long bubble motion in stagnant flow. The obtained 3D results are applied to define the input parameters of an established one-dimensional model.
Chen et al. (Tue,) studied this question.
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