Intensive cooling of large surfaces with arrays of jets

The attention of the present paper is focused on the intensive heat removal with arrays of impinging jets. Three jet configurations are tested which involve variation of geometric parameters such as nozzle shape, diameter and nozzle-to-nozzle spacing and impingement distance and of flow rate. The convective heat transfer coefficient is measured with infrared thermography applied to the heated-thin-foil technique. Data are reduced in dimensionless form in terms of average Nusselt number and plotted against the Reynolds number and the impingement distance. The average Nusselt number values are also expressed as a function of the Reynolds number following the correlations available