Abstract
The temperature fields on an impingement plate are fluctuated when the jet impinged on it, because jet is fluctuated by shearing vortices generated at a nozzle exit. To clarify the influence of flow fluctuations on temperature fields, the time and spatial temperature profiles over the impingement plate were measured using an infrared radiometer, moreover the flow fields were visualized by the means of Fluorescein injected upstream nozzle exit. It is found that the heat transfer was enhanced due to the sweep like motion of thermal boundary layer, and that the frequency of fluctuating temperature on the heated plate nearly corresponds to that of the passing vortex over the heated plate.
