Experimental study of the heat transfer of impinging chevron jets

In the present work, experimental results to show the impact in heat transfer of chevron impinging jets is going to be described. The object of study will be heat transfer coefficient, through the Nusselt number, of chevron impinging jets, by putting caps with different chevron configurations at the end of a nozzle. The parameters for the design of these caps are the number of chevron indentations (4 and 8), chevron length (4 and 8 mm) and chevron type (positive and negative). The technique used for the measurements is infrared thermography, making use of the heat flux sensor theory. Nusselt number maps are going to be obtained and discussed. The whole experimental set up and performance was carried out in the laboratory of the university, and the experimental set up and procedure is going to be explained in detail. The Reynolds number used for all experiments was 10000 and the nozzle exit was placed at distances 2, 4, 6 and 8 nozzle diameters. It will be seen, that certain chevron configurations show a better behavior than a standard circular nozzle, in some cases a 8-10% in heat transfer performance.Ingeniería Aeroespacia