Title: Numerical simulation on process of heterogeneous mass transfer of oxygen in stirred tank
Abstract: The influences of impeller type and stirring rate of agitator on the process of oxygen mass transfer in a vessel were investigated by experimental studies and computational fluid dynamics(CFD) simulations.To verify the accuracy of CFD simulations,experiments were carried out.The results of simulations with user defined function(UDF) of the effects of impeller type and stirring rate on the velocity field were in good agreement with the output of particle image velocity(PIV).The oxygen mass transfer model can be used to predict the process of oxygen mass transfer in a vessel,and the logarithmical expression can successfully describe the relation between the oxygen concentration and the dissolution time. The disc impeller can bring larger turbulent kinetic energy dissipation than the narrow impeller,thus accelerating the oxygen mass transfer in the vessel. In the case of same impeller type and vessel geometry,the dissolution oxygen concentration grows faster with increasing impeller speed.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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