Kinematics of a Single Condensed Water Slug in High Pressure Steam Line
To analyze the kinematics of a single slug in void line driven by high-pressure steam,numerical experiments based on three-dimensional CFD model are carried out and the impact pres-sure and the mass loss rate during its motion are investigated.The study found that the mass loss coefficient of the slug is proportional to its moving distance,and is independent with the driving pressure;the mass loss rate is related to the moving distance,and is independent with the driving pressure and the initial length of the slug.With the obtained mass loss rate,a new one-dimensional theoretical model is developed,and the calculation results are verified against the experimental data and CFD simulations.The results of the three dimensional CFD model and the proposed one di-mensional model are in good agreement with the experimental data.In addition,in view of the mass loss rate,we well explained the experimental observation that when the moving distance of the slug is more than five times of its initial length,the slug will be penetrated by the driving gas,resulting in a significant decrease of the impact force.The proposed one-dimensional model can guide the practical engineering applications.
slug flowelbow impactthree-dimensional CFD simulationmass lossone-dimensional theoretical model
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