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The purpose of this work is the experimental analysis of the heat transfer between a flat plate and a swirling air jet impinging on it. A swirling nozzle based on helical inserts, of easy application in industrial environment, has been developed and experimental measurements are done at a fixed value of Reynolds number (Re is based on the flow rate and on the nozzle diameter, Re=30000) for five values of Swirl number S (0, 0.2, 0.4, 0.6 and 0.8) and five values of nozzle to plate distance (2, 4, 6, 8 and 10 diameters). Experimental measurements are done by means of IR thermography with the heated thin foil sensor. The different behaviors of multi-channel jets, weak swirl jets and strong swirl jets are shown. The uniformity of the heat transfer and the global heat transfer rate are quantified as mean value and standard deviation percentage of Nusselt number on the impinged area. The performances in term of heat transfer uniformity and heat transfer rate provided by swirling jets are also presented and analyzed. The dependence of the heat transfer rate and uniformity on the swirl number is also explained.

IR wall heat transfer in swirling impinging jets