| Abstract: | The drift-flux model is widely used for gas-liquid two phase flow analysis, because it is applicable to various flow patterns and a wide range of void fractions. The drift- flux parameters for upward gas flow in stagnant liquid, however, have not been well examined. In this study, the distribution parameter Co and the drift velocity Vgj for stagnant liquid were derived from the void fraction correlation and boundary conditions of drift-flux parameters, and then compared with Co and Vgj for high liquid velocities. Also using the two region model where a circular flow area was divided into an inner region of cocurrent up-flow and an outer annulus region of liquid down flow, Co and Vgj for stagnant liquid and for high liquid velocity were compared. The results showed that Co values for stagnant liquid were larger than values for high liquid velocity, while Vgj values were almost the same for both cases. |
