通気攪拌槽内の流体の流れ
1985 年 71 巻 9 号 p. 1117-1124
詳細
1985 年 71 巻 9 号 p. 1117-1124
Characteristics of bubble dispersion and fluid flow in a gas-stirred vessel have been studied.
Nitrogen gas was injected into water through a 0.6 cm diameter nozzle at the center of the bottom of 0.29 m diameter acrylate vessel. Flow patterns were visualized by using insoluble salt particles dispersed in water. In order to simulate the flow patterns, the "bubble dispersion model" is proposed. This model consists of equations of flow and bubble dispersion with constant values of effective kinematic viscosity, υe, and effective dispersion coefficient of bubbles, De. The values of De are assumed to be equal to those of υe and are calculated by the ad hoc model proposed by SPALDING et al.
The computed flow patterns were roughly consistent with the observed results in the range of qG=1.67×10-51.67×10-4 m3/s and z1=0.10.4 m, where qG is the gas flow rate and z1 is the height of water.
