LAUSR

Abstract The heat transfer performance of a flat plate behind a 10 mm high (h) and 20 mm long delta winglet was studied at a distance up to 30h in a wind tunnel at a Reynolds number based on h of 6000. The focus was on the role of the attack angle, which was varied from 30 to 60° in 15-degree increments. The bottom side of the flat plate was uniformly heated by condensing steam at 100 °C. Surface thermal imaging results indicated that the peak Nusselt number (Nu) increases with the attack angle, and this augmentation was attributed to the larger share of the transverse vortex at the larger attack angles. Peak Nu dropped sharply in the near wake (X/h