Experimental and CFD investigation on mixing by a jet in a semi-industrial stirred tank

The CFD code with the ability of simultaneous solving of the continuity, the Reynolds-averaged Navier-Stokes (RANS) equations and employing various types of turbulence models was used. The effect of the mesh size on the predicted results was investigated and the theoretical results obtained from various mesh sizes configuration were compared with the experiments. The results showed that the number of meshes is quite effective on the obtained theoretical results in a way that the predicted results for the largest mesh size were far away from the experiments. In addition, the two equation k-ɛ family models including: standard, RNG and realizable models were introduced to the code and the effect of these models on the predicted results was investigated. The results show that there are considerable differences between the predicted mixing progress using the three versions of the k-ɛ family models. The RNG k-ɛ model shows more convincing results in comparison with the other models.