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论文类型：期刊论文

发表时间：2017-01-01

发表刊物：IEEE ACCESS

收录刊物：SCIE、EI、Scopus

卷号：5

页面范围：2711-2719

ISSN号：2169-3536

关键字：Internal loop airlift reactor; computational modeling; PBM-CFD; bubble size distribution; experiment validation

摘要：This paper investigated the problem of overall gas holdup and the oxygen mass transfer in the internal loop airlift reactor by numerical modeling and experimental validation. The population balance model (PBM) was introduced as the general model to characterize the bubble behaviors, i.e., bubble breakage and coalescence. Bubble coalescence, as a result of fluid turbulent eddy, bubble rise difference, and bubble wake entrainment, was considered in the PBM kernels. Meanwhile, bubble breakage, owing to eddy collision and large bubble instability, was included in the PBM kernels. A class method was applied to numerically solve the population balance equations. Based on the lab-scale internal loop airlift reactor, experiments and CFD simulations have been carried on simultaneously. The comparison between them demonstrated that CFD simulation results had good agreement between the experimental data and validated the effectiveness of the PBM model indirectly. Therefore, the PBM-CFD modeling provides an effective method for the problem of scale up. Finally, the flow regime transition of gas holdup difference and small bubble volume fraction are investigated in an internal loop airlift reactor.