2009•Chemical Engineering(China)Requires access
Computational fluid dynamics simulation of gas-liquid oxygen transfer with different impeller combinations
Yin Tang
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Abstract
The influence of impeller combination on the gas-liquid oxygen transfer in stirred tank was investigated. The theoretical model of gas-liquid oxygen transfer proposed by Garcia-Ochoa and Gomez based on Higbie's penetration theory was used to simulate the process of gas-liquid oxygen transfer in stirred bioreactors with commercial software of computational fluid dynamics (CFD),ANSYS CFX 11.0. The gas-liquid oxygen transfer coefficient and steady-state distribution of oxygen concentration with and without oxygen consumption were both simulated and compared under different impeller combinations. It shows that the combination with upper axial impeller and downer radial impeller possesses the highest oxygen supply capacity,and there is no direct relationship between the volume oxygen transfer coefficient and impeller type,the same impeller installed with different impeller combinations produces different volume oxygen transfer coefficient.