浆态床外环流反应器的流体力学特性

研究了浆态床外环流反应器内的局部流体力学特性，获得了局部气含率、气泡Sauter平均直径和气泡上升速度的轴向剖面。实验数据表明，气泡直径和上升速度收到固含率的影响，固含率的增加能够强化气泡的聚并。通过局部气含率、气泡直径和实验体系的物性等数据，建立了一个能够计算相间滑动速度的关联式，该关联式能够用于计算气泡群的局部曳力系数。

Flow Characteristics in an External-Loop Airlift Slurry Reactor

The local flow characteristics in an external-loop airlift slurry reactor were investigated.The axial profiles of the local gas holdup,the Sauter mean diameter and the rise velocity were obtained.It was found that the bubble size and rise velocity were influenced by the solid holdup,and the bubble coalescence was enhanced by the increase of the solid holdup.A new correlation was used to predict the slip velocity between the gas phase and the slurry phase by taking into account the local gas holdup,the bubble size,and the physical properties of the experimental system.By using this correlation,the local drag coefficient can be calculated in the bubble swarm.