Noboru Fujimoto

Development of the drift-flux model for a multi-phase flow analysis

A modified drift-flux model is developed for analyses of two dimensional gas-liquid and solid-liquid two-phase flows. The basic idea lies in a hypothesis that as far as the drift velocity is concerned, a dispersed phase wiI1 behave in a modified gravitation or acceleration field g that includes, among others, the centrifugal acceleration effect due to curvatures of streamlines, without distinction between accelerations due to different forces. Therefore, the terminal velocity of the dispersed phase in the continuous phase can be obtained by simply replacing with g the gravitation field g in the correlation of the terminal velocity obtained by a simple one dimensional experiment. Two-dimensional numerical analyses based on the drift-flux model were performed to analyze those dispersed phase flow structures in a tank filled with saturated water. By comparing the numerical results with the experimental observation, the validity of the drift-flux model for the case of multi-dimensional multi-phase flows was investigated.