This thesis is part of an investigation project, which aims to improve the cooling efficiency of a tunnel kiln, in order to short the cooling section and make the process more efficient by saving energy and increasing the production of iron powder.

The study carried out in this thesis has focused on the distribution of the airflow inside the cooling part of the furnace, depending on the different positioning of the impinging jets. In order to investigate it, a scale model of the kiln was build inside a wind tunnel laboratory and Computational Fluid Dynamics (CFD) simulations were done, in order to simulate similar conditions to the real case.

During the experimental analysis, different measurements of the velocity profiles at the model had been carried out with Laser Doppler Anemometer (LDA) and hot film anemometer techniques. The obtained experimental results at the model had been used as boundary conditions for different CFD simulations, and for validating the obtained CFD results in the different computational models studied.

As a result, it has been proved that depending on the different configuration of the jets, the distribution of the flow in the model is affected: decreasing the Bypass Effect and creating a more uniform distribution of the flow.