自吸式反应器气液传质实验研究和CFD模拟

CFD simulation and experimental studies of gas-liquid mass transfer in gas-induced reactor

对一种自吸式反应器的气液分散性能进行了实验研究,并采用计算流体力学(CFD)ANSYS CFX中对自吸式反应器在600,800,1 000,1 200 r/min 4种转速条件下气液二相流的流场、局部气含率及整体气含率进行了数值模拟,并采用Higbie溶质渗透模型模拟研究了反应器的容积传质系数。研究结果表明:气液二相流场与高速摄像机拍摄的结果相同,成对称分布;自吸式反应器的局部气含率分布均匀,上下分布良好,整体气含率的模拟结果与实验结果一致,实验值和模拟值误差为5.1%;局部容积传质系数分布良好,气体出口附近较好,容积传质系数模拟值与实验值变化趋势一致。

A kind of gas-induced reactor was studied experimentally, and CFD was applied to simulate the flow field, local air volume fraction and total air volume fraction of such reactor in the conditions of 600, 800, 1 000, 1 200 r/m, and the volumetric mass transfer coefficient was investigated by using Higbie＇s penetration model. The results show that the flow field of gas-liquid two phases has good agreement with the image by high-speed camera; local air volume fraction distributes uniformly and coincides with the result measured by experiment, and the error between simulation and experiment is 5. 1% ; the prediction of local volumetric mass transfer coefficient has the same variation trend with that of experiment.