垂直上昇気液二相流の液体塊速度に及ぼす液粘性の影響
存在時間の長い液体塊の速度特性
1995 年 9 巻 2 号 p. 121-131
詳細
1995 年 9 巻 2 号 p. 121-131
The effect of liquid viscosity on the liquid-lump velocities was experimentally investigated for vertical-upward co-current flow of air and liquid in a 19.2mm ID cylindrical pipe. Water and glycerol solutions were used as working fluids to change the kinematic viscosity of liquid phase from 1.0×10-6 to 15.5×10-6m2/s. Flow regimes considered were slug flow, huge wave flow and annular flow. The liquid-lump velocities are discussed paying attention to the long-life liquid lump.The liquid-lumps were discriminated based on the time-spatial characteristic map of gas-liquid interfaces, which was drawn by using the mean liquid holdup signals detected by 70 pairs of holdup sensors arranged axially with a spacing of 15mm over the length of 1.035m. Velocities of this liquid lump were determined by the two arbitrary adjacent liquid holdup signals out of 70 ones. It is elucidated that the liquid vicosity has strong effects on the passing frequencies, the mean velocity and its standard deviations of the long-life liquid lumps. Furthermore, based on the characteristics of these values the effect of liquid viscosity upon the transition of flow regimes is discussed.
