Abstract
In order to study the flow characteristics of fluid falling film evaporation in a vertical pipe and obtain the dynamic parameters of steam-water two-phase flow, a three dimensional numerical simulation on flow behavior of falling film evaporation was carried out to capture the free surface of falling liquid film with the volume of fluid (VOF) model. The steam-water two-phase flow dynamic characteristics including liquid film flow pattern, liquid film thickness, wall shear stress and velocity distribution of flow field were analyzed through changing feed flow velocities. The results show that under different inlet flow velocities, the average thickness of liquid film from simulation agrees with empirical value well. The film thickness decreases sharply in the entry section which is less than 100mm. The change of wall shear stress is similar to that of film thickness along flow direction, but the change of film thickness has hysteresis quality. Under the influence of gravity and wall shear stress, the accelerated motion and decelerated motion of liquid film alternate, and the flow velocity inside liquid film increases with the distance from liquid film to wall surface, and reaches the maximum at the steam-water interface.
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