抄録
The reactor vessel involving batch operations has been widely used in the ferrous and non-ferrous production processes. In their processes, more than one liquid phase are usually contained in the vessel, and it is desirable to discharge each phase separately as fast as possible. In separating co-existing two kinds of liquids, the liquid of the bottom layer is usually discharged through a nozzle located at the bottom of vessel. However, as lowering the liquid-level by discharging the liquid, a swirling flow generates, and the rate of discharging the liquid decreases. Moreover, the liquid of the upper layer is caught by the swirling flow, and the upper liquid begins to discharge along with the bottom one. In the present study, the efficient discharge method of liquid in a cylindrical vessel type reactor by the prevention of a swirling flow generation was examined through water-model experiments. It is confirmed that to lengthen the nozzle shortens the water discharging time if the generation of air-core is prevented. Then, the larger the initial angular velocity of water surface and the shorter the nozzle length, the higher the water level at which air-core arises. The effect of the initial angular velocity is much larger than that of the nozzle length. The prevention of the generation of the air-core is one of essential factors in separating coexisting two liquid phases perfectly at high speed. The gas injection is effective for preventing the generation of air-core.
