弓形降液管内的气含率分布

采用毛细管不我电检测技术，测定了弓形降液管内气含率的三维分布。实验结果表明，在降液管中心处的气含率高于两侧，在外侧的气含率高于内仙。沿高度方向气含率的分布分为三个区：第一区为高气含率区，第二区为气含率显著变化区，第三区为下层低气含率区。在每一区内，气含率都随液体流率的增加而增加。研究结果为设计更合理的降这提供了实验依据。实验还表明Ｈｏｆｈｕｉｓ关于乳化态的据是有局限性的。

Gas Hold-up Distribution in Segment Downcomer

The three dimensional distribution of gas holdup in segment downcomer has been measured by using the capillary probe and the photoelectrical detect technique.The experimental results show that the gas hold-up at the center of the downcomer is higher than that on both sides.The gas holdup on the outside is higher than that on the inside. The distribution of gas hold-up along the height is divided into three regions: the first is of high gas hold-up,the second is of marked variation,and the third is of low gas hold-up. In every region,the gas hold-up increases with the liquid rate.These results provide experimental reference for designing more reasonable downcomers.The experiments also show that there is a limit to Hofhuis' criterion of emulsion state.