Abstract
In this paper, experiments are conducted to determine the heat transfer characteristics by a square or rectangular (aspect ratio = 4 or 8) nozzle jet impinging obliquely to a plane surface. The impinging angles of the jet relative to the plane surface are 60, 45 and 30 degrees. The nozzle-to-plane distance varies from 2 to 10 times the short side length of nozzle. The local temperature distribution on the impingement surface is obtained by using a liquid-crystal sheet. Furthermore, the velocity and turbulence intensity near the impingement surface are measured by using a hot wire anemometer. The results show a good agreement with the peak points of local heat transfer and turbulence intensity.
