| The present study addresses the experimental investigation of impingement heat transfer in a trapezoidal cross-section model simulating a trailing edge cooling cavity with one rib-roughened wall and slots along two opposite walls using steady state liquid crystal technique. In these geometries, the cooling flow enters the trailing edge cavity from the supplying channel through a row of race-track shaped slots (Crossover holes) with 0¢ª tilt angle, impinging on a rib-roughened trailing edge wall and exits from the opposite row of race-track shaped slots. There were four different geometries tested, depending on the alignment of the cross over holes and the exit holes were either inline or staggered, and the blockage of the cross over holes and the exit holes. The first and the last crossover holes were blocked in the first two geometries (9 crossover holes), and the first two and the last two crossover holes were blocked in the other two (7crossover holes). For each geometry setting, a range of Reynolds numbers was tested. The graphs of the Nusselt Number versus the Reynolds Number were compared for all geometries. The results showed that the Nusselt numbers increase monotonically with increasing Reynolds numbers. It was also found that the Nusselt Number is higher in the 7 cross over holes case than the 9 cross over holes case in both inline and staggered arrangements. Furthermore, Heat transfer coefficients decreased significantly near the blocked slots. |
