Abstract
Local heat transfer characteristics of high temperature impinging two-dimensional air jets were investigated by using a novel multi-pulsed laser holographic interferometry. Thermal flow fields at nozzle-to-plate space were visualized real-time for various jet velocities and nozzle-to-plate distances, which were recorded by using a high-speed streak camera(5000fps). Instantaneous development and growth of streamwise vortices were clearly visualized by this novel method. The results indicate that the local heat transfer coefficients are greatly affected by the large-scale vortices which appear in the wall jet region. Furthermore, it could be demonstrated that this multi-pulsed laser holographic technique is effectively applicable to the high-speed observation of the impinging jets.
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