Heat transfer performance of a confined single slot jet of air impinging on a flat surface

In the present work, results of an experimental study are shown. The aim of the study was to determine the thermal performance of a confined impinging slot jet of air. Influence of nozzle width B, Reynolds number and nozzle to plate spacing H/B on the Nusselt number was investigated. Graphs showing lateral variation of the local Nusselt number on the impinging surface for selected experimental runs are presented. The results of the investigations shall help to develop an optimal model of air solar collector, the construction of which uses impinging slot jets. The Lx parameter that allows to determine the region with increased intensity of heat transfer was introduced. Mean Nusselt number NuLx for this region was determined. For both parameters, correlation functions of Reynolds number, B and H/B were developed using multiple regression method. In the article, graphs that allow assessment of statistical analysis quality are presented.