CFD simulation of internal-loop airlift reactor using EMMS drag model

作     者：Tingting Xu Xuedong Jiang Ning Yang Jiahua Zhu 

作者机构：State Key Laboratory of Multi-Phase Complex SystemsInstitute of Process EngineeringChinese Academy of Sciences University of Chinese Academy of Sciences Department of Chemical EngineeringXi'an Jiaotong University School of Chemical EngineeringSichuan University 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2015年第13卷第2期

页      面：124-132页

核心收录：

学科分类：080704[工学-流体机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：the National Natural Science Foundation of China(21222603,U1162107) Ministry of Science and Technology of China(2013BAC12B01) the Strategic Priority Research Program of Chinese Academy of Sciences(XDA07080301) for their long-term support 

主　　题：Computational fluid dynamics Internal-loop Airlift Multi-scale Multiphase flow Hydrodynamics 

摘      要：The simulation of internal-loop airlift reactors is challenging because complex meso-scale structures exist in different sections of the reactor, separated by the draft tube. This paper reports on the computational fluid dynamics （CFD） simulation of internal-loop airlift reactors using a new drag model derived from the dual-bubble-size （DBS） model, an extended energy-minimization multi-scale （EMMS） approach for gas-liquid flows. Compared with the traditional Schiller-Naumann （S-N） correlation, the new model improves the simulation of gas holdup in the riser and downcomer significantly. In particular, gas holdup and circulation of two-phase flow can be modeled successfully using the new model, whereas traditional drag models such as the S-N correlation show an absence of gas in the downcomer. The simulation demonstrates the advantage and potential of this new model for internal-loop airlift reactors.