Abstract
The local heat transfer characteristics of non-isothermal two-dimentional impinging hot air jets were investigated experimentally. Average and local heat transfer coefficients between an impingement plate and two-dimensional impinging hot air jets were measured by thermocouples mounted in a heat transfer block. Furthermore, the spontaneous appearance and growth of streamwise vortices were observed by high speed real-time laser holographic interferometry. From the results, it was found that the local heat transfer characteristics were quite different with in case of single nozzle and in case of multi-slot nozzles. Also it was cleared that the local heat transfer coefficients at the stagnation line were affected by the large-scale vortices on the boundary layer.
