Flow and heat transfer characteristics of a two-dimensional oblique wall attaching offset jet

Turbulent flow and heat transfer characteristics of a two-dimensional obliq ue wall attaching offset jet were experimentally investigated. The local Nu sselt number distributions were measured using liquid crystal as a temperat ure sensor. The jet mean velocity, turbulent intensity and wall static pres sure coefficient profiles were measured for the jet Reynolds number, Re = 5 3,200, the offset ratio (H/D) from 2.5 to 10, and the oblique angle, alpha from 0 degrees to 40 degrees. It is observed that the time-averaged reattac hment point nearly coincides with the maximum Nusselt number point for all oblique angles, but the maximum pressure point does only for alpha = 0 degr ees. The decay of the maximum jet velocity in the streamwise direction is f ound to obey the conventional -1/2 power law of the wall attaching offset j et for alpha less than or equal to 30 degrees. The reattachment length and maximum pressure point are well correlated with offset ratio and oblique an gle. The correlations between the maximum Nusselt number and Reynolds numbe r for all oblique angles tested are presented. (C) 2000 Elsevier Science Lt d. All rights reserved.