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 hol-low 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-ε 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 re-sults were compatible and acceptable. The results of the study were examined as the mean Nusselt number, surface temperature, and performance evaluation coef-ficient 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.