Numerical simulation of the onset of droplet entrainment in annular flow by particle-grid hybrid method

Abstract:

In this paper the particle-grid hybrid numerical method is used to investigate the onset of droplet entrainment in annular flow. The flow field is solved on the grid and the motion of fluid film and droplet is solved by particles. Under large density ratio between gas and liquid the critical velocities of droplet entrainment for different flow directions, viscosities and fluid film thicknesses were obtained. The results are in good agreement with classical correlation. This method provides valuable references and guidelines for further study of the two-phase flow in nuclear reactor accident.