Numerical Simulation of Gas-Liquid Two-phase Flow in a Bubble Column with Various Drag Models
LI Meng LI Xiang-yang WANG Hong-zhi XIE Yong-bing CAO Hong-bin
School of Chemical Engineering and Technology?, Tianjin University? Institute of Process Engineering, Chinese Academy of Sciences School of Chemical Engineering and Technology?, Tianjin University? Research center for process pollution control, The National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences Institute of Processing Engineering ，CAS
Abstract：A 3D numerical simulation of gas-liquid two phases flow in a cylindrical bubble column was conducted with Euler-Euler two-fluid approach. The gas velocity on outlet boundary condition was corrected by user-defined function (UDF) custom programs, which could prevent the flows above the liquid level from forming eddy. The single bubble size model and population balance model (PBM) were used to calculate the bubble size separately, and the results by using the two models were compared. Three drag models (i.e. Schiller-Naumann, Grace and Tomiyama models) coupling with PBM were used and analyzed. The results show that the single bubble size model is no longer appropriate for the uniform air inlet boundary condition; The Abrahamson model in PBM, which is used for particle aggregation, can calculate the bubble aggregation if an appropriate Hamaker constant is set. The predicted results by using Tomiyama model coupling with PBM model are in good agreement with the existing results reported in the literature. The average gas holdup by using Schiller-Naumann model is about 40% different from the experiment value. The turbulent kinetic energy dissipation by using Grace model is 14.5% higher than the result of Tomiyama model, the errors of the predicted gas holdup distribution caused by using Grace model is 16.3%.
李孟 李向阳 王宏智 谢勇冰 曹宏斌. 鼓泡塔气液两相流不同曳力模型的数值模拟[J]. , 2015, 15(2): 181-189.
LI Meng LI Xiang-yang WANG Hong-zhi XIE Yong-bing CAO Hong-bin. Numerical Simulation of Gas-Liquid Two-phase Flow in a Bubble Column with Various Drag Models. , 2015, 15(2): 181-189.
2015, Vol. 15 
