Numerical investigation of the effect of shape, arrangement and orientation of nozzles on heat transfer of multiple impinging jets in flat plate cooling

In this study, the effects of nozzle angle variations on vertical axis on nozzles plane has been investigated. Cooling and heating are one of the most important industrial processes that are widely used in industry, for this reason multiple impinging jets have been considered to study by many researchers due to their efficiency and high heat transfer. Simulations has been carried out using SST k-omega turbulence model. First, the cooling by elliptical nozzles are investigated to show increasing their efficiency compare to circular nozzles. Then the arrangement and orientation of the nozzles have been investigated. The obtained results showed that the nozzles angle variation, in some cases can lead to increase in the thermal flux. The modeling results showed that when the diameter ratio are equal to 10 and 4, the change in angle of nozzles had a negative effect on the heat transfer value, While in the diameter ratio of 3, changing the angle of the nozzles increased the heat transfer by about 3.71%. Also, numerical studies showed that changing the angle has little effect on creating heat transfer uniformity.