Heat transfer modelling of slot jet impinging on an inclined plate

A numerical study has been conducted to investigate the heat transfer in the turbulence, unconfined, and submerged flat and inclined plate impinging jet discharged from a slot nozzle by using the commercial finite volume code FLUENT. The Reynolds number in the range of 4000-16000, the nozzle exit-to-plate spacing (H/D) in the range of 4-10 and the inclination angle of air jet and plate in the range of 40-90 have been considered. The constant heat flux of 100 W/m(2) is set to the impinging plate. Two k-epsilon RNG and Reynolds stress models and an Enhanced Wall Treatment for near wall turbulence modelling were applied in all cases and the local Nusselt number on the impinging plate has been compared with experimental results. The Enhanced Wall Treatment by solving the fully turbulence region and sublayer and using a single function improves the effect of pressure gradients and thermal effects. In an inclined impinging jet the stagnation point and maximum Nusselt location move to the uphill side and decreasing of the Nusselt number is more gradual on the downhill side. The movement of maximum Nusselt point to the uphill side increases by increasing the Reynolds number, H/D and by decreasing the inclination angle. The numerical results predict the heat transfer rate in a flat plate impinging jet by less than 10% error, however for an inclined impinging jet with different H/D the results are 5-20% different in comparison with experiments.