Numerical simulation of the gas–liquid two-phase flow in aeration tank based on different multiphase models

Abstract

In this paper, the Eulerian model and Mixture model are used to study the free surface, internal flow and mass transfer in the aeration tank. The two multiphase models affect the liquid velocity, internal flow and oxygen mass transfer coefficient (kLa) of the tank. Eulerian model than the Mixture model significantly higher simulates the liquid velocity near the impeller, and the range of the main longitudinal circulation vortex is smaller than Mixture model. The error between the simulated kLa of Eulerian model and the experimental value is smaller than Mixture model. The results show that the Eulerian model is more suitable for the simulation of the gas–liquid two-phase flow in the aeration tank.