Heat transfer increment study taking into consideration fin lengths for CuO-water nanofluid in cross flow-impinging jet flow channels

Abstract

In this study, the heat transfer and flow characteristics for cube and circular hollow models in channels with the cross-flow-impinging jet-flow were numerically investigated by using water and 2% CuO-water nanofluid. The numerical work was carried out steady and 3-D using the ANSYS-FLUENT program with the k-? turbulence model. A fin with 45? and 90? angles and D, 1.166 D, and 1.333 D (K) lengths was added to the upper channel surface from the impinging jet inlet at D (N) distance. A constant heat flux of 1000 W/m2 was applied to the model surfaces. The channel height is fixed in 3D (H) and the Reynolds number range of the fluids is 5000-15000. The numerical results obtained from the study were compared with the results of the experimental study in the literature and it was seen that the results were compatible and acceptable. The results of the study were examined as the mean Nusselt number, surface temperature, and performance evaluation coefficient variations for each model in the channels. Also, velocity and temperature contour distributions of the combined jet CuO-water nanofluid flow were visual-ized. The average Nusselt number increases for CuO-water nanofluid at Re = 15000, K = D, and 90? fin angle are 32.55% and 26.11% compared to with-out fin and water fluid for cube and circular hollow models, respectively.