A turbulent mass diffusivity model for analyzing the mixing characteristics in an impinging stream-rotating packed bed  

作　　者：Chao Zhang Youzhi Liu Weizhou Jiao Guisheng Qi Zhiguo Yuan Qiaoling Zhang Hongyan Shen 

机构地区：[1]Shanxi Province Key Laboratory of Chemical Process Intensification,North University of China,Taiyuan 030051,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第10期133-143,共11页中国化学工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (22208328, 22378370 and 22108261);Fundamental Research Program of Shanxi Province(20210302124618)

摘　　要：In this study,the fluid flow and mixing process in an impinging stream-rotating packed bed(IS-RPB)is simulated by using a new three-dimensional computational fluid dynamics model.Specifically,the gaseliquid flow is simulated by the Euler-Euler model,the hydrodynamics of the reactor is predicted by the RNG k-εmethod,and the high-gravity environment is simulated by the sliding mesh model.The turbulent mass transfer process is characterized by the concentration variance c^(2) and its dissipation rateεc formulations,and therefore the turbulent mass diffusivity can be directly obtained.The simulated segregation index Xs is in agreement with our previous experimental results.The simulated results reveal that the fringe effect of IS can be offset by the end effect at the inner radius of RPB,so the investigation of the coupling mechanism between IS and RPB is critical to intensify the mixing process in IS-RPB.

关 键 词：Impinging stream-rotating packed bed Turbulent mass diffusivity model Computational fluid dynamics Mixing performance Segregation index 

分 类 号：TQ027.1[化学工程]