Abstract
The time and spatial temperature profiles on the impingement jets were measured by using an infrared radiometer with a two-dimensional array of Indium-Antimony (In Sb) sensors. The infrared images or heat transfer characteristics of circular, elliptic and elliptic dual jets impinging on the surface of target plate were experimentally studied for various separations between the nozzle exit and the target plate. The phenomena of axes switching, which is caused by the differences in the self-induced velocity in the non-circular vortices, was observed further downstream compared with that of a single impingement jet.
