AN EXPERIMENTAL INVESTIGATION OF IMPINGEMENT HEAT TRANSFER IN NARROW SPACE WITH FULL-HEIGHT PIN FINS

摘要

An experimental study has been conducted on multiple-jet impingement heat transfer in a narrow space with full-height pin fins under maximum cross flow scheme. Transient liquid crystal thermography method has been used to obtain the detailed impingement heat transfer distribution for the Reynolds numbers from 15,000 to 30,000. The experimental study shows that the spanwisely-averaged Nusselt number ratio (Nu)/(Re~(0.8)Pr~(1/3)) is almost independent of Reynolds numbers, and the full-height pin-fin arrays can slightly improve the average Nusselt number on the endwall of the target plate by about 5.0％, and increase the pressure loss by up to about 17.9％. It is also found that heat transfer uniformity is also improved on the endwall of the target plate with pin fin arrays.