| Heat transfer enhancement under a single semi-confined turbulent slot jet for planar and non-planar surfaces was studied experimentally by modification of flow region using several configurations of nozzles and turbulence generators (turbulators). The results show both positive and negative effects of heat transfer compared with those for a smooth slot nozzle with the same equivalent width (and length) under the same experimental conditions.;The experimental results show that the heat transfer rate for the narrower nozzle of 5 mm width is much higher than that for the wider nozzle of 7.5 mm width at same jet Reynolds number. For planar surfaces the insertion of turbulence generators in the jet flow was also examined to see their effect on the impingement heat transfer.;Three rough-edged nozzles, i.e. right-triangular, equilateral-triangular and rectangular nozzles, were tested for both planar and non-planar impingement surfaces. (Abstract shortened by UMI.). |
