Experimental and CFD Studies on the Effect of the Jet Position on Mixing Performance

The effect of jet positions on the homogenization progress of a dye in a rectangular tank equipped with a jet was studied. Water entered the tank laterally from the top and left the tank from the opposite wall at the same height. The suction position was fixed at one of the tank corners and seven positions were considered for the jet nozzle. A predefined volume of the dark Nigrosine was injected to the tank input as the tracer during 4s in all experiments. During the dye injection and mixing progress, the front and bottom views of the tank were recorded by a digital camera. The experimental results showed that as the jet nozzle was installed in the opposite wall from the tank input, the worst performance was obtained in comparison with the other jet positions. However, the jet nozzle position of 90 with respect to the tank input had the best performance. All of the experiments were modeled by Computational Fluid Dynamics (CFD). Finally, the CFD predicted dye spreading was verified by the experimental observations and a good agreement was observed between the CFD and experimental results.