Convective heat transfer by a row of jets impinging on a concave surface

The attention of the present work is focused on the heat transfer between a concave surface and a row of air jets impinging on it. Measurements are performed with the heated thin foil heat transfer sensor using IR thermography as temperature transducer. Experimental tests are carried out by varying jets inclination, pitch, impinging distance, Mach and Reynolds numbers. Data is reduced in dimensionless form in terms of the Nusselt number and analyzed by separately accounting for the influence of the main relevant parameters. As main results, 3D Nusselt maps show presence of stream-wise vortices driven by surface curvature, jet inclination and jet pitch. At last, the Nusselt number, averaged over the impinged area, is represented as a function of the Reynolds number following a data correlation present in literature.

convective heat transfer; impinging jets; curved flow; ir thermography; wing anti-icing; turbine blade cooling

Convective heat transfer by a row of jets impinging on a concave surface Articles