垂直管上昇環状流における液膜界面積濃度の軸方向発達

抄録

Accurate measurements of annular flow parameters such as local liquid film thickness, one-dimensional interfacial area concentration of liquid film, and local interfacial area concentration profile of liquid film were performed by a laser focus displacement meter at 21 axial locations in vertical upward annular two-phase flow using a 3-m-long and 11-mm-diameter pipe. The axial distances from the inlet (z) normalized by the pipe diameter (D) varied over z/D=50 to 250. Data were collected for preset gas and liquid flow conditions and for Reynolds numbers ranging from Re_g =31 800 to 98 300 for the gas phase and Re_f=-1 050 to 9 430 for the liquid phase. Axial development of the one-dimensional interfacial area concentration and the local interfacial area concentration profile of liquid film were discussed with the data obtained in the experiment. Total interfacial area concentration including liquid film and droplets was also discussed with regarding to the exinting drift-flux model, entrainment correlation, and droplet size correlation.