## 3 Results
### Variation in Nusselt Number with Re
For D = 40 mm, the increments ranged from 1.2% to 6.6% for consecutive velocities, with a total increase of 16.1% between the minimum and maximum velocities. The experimental results for a constant heat flux of 200 W and an inclined heat sink at an angle of 10\({}^{\circ}\) with a height-to-diameter ratio of seven indicated that the heat transfer enhanced with the increasing fluid velocity and nozzle diameter. The experimental results for a constant heat flux of 200 W and an inclined heat sink at an angle of 10\({}^{\circ}\) with a height-to-diameter ratio of eight indicated that heat transfer enhanced with the increasing fluid velocity and nozzle diameter. For h/d = 8, with a nozzle diameter of D = 25 mm, the Nu showed an increase of 5.9-11.4% between consecutive velocity increments and a total increase of 42.6% between the minimum and maximum velocities. For D = 32 mm, the increases ranged from 4.7% to 7.2% between consecutive velocities and 26.6% between the minimum and maximum velocities. Finally, for D = 40 mm, the increments were between 1.8% and 5.8% for consecutive velocities, with a total increase of 15.7% between the minimum and maximum velocities. The Nus corresponding to the maximum and minimum flow velocities for a rectangular finned heat sink inclined at 10\({}^{\circ}\) were compared for the same nozzle diameter across varying ratios of the h/d to nozzle diameter. At a dimensionless distance of h/d = 6 and h/d = 7 and a nozzle diameter of 25 mm, a 9.8% reduction in the Nu was observed between minimum velocities (4.0 m/s), and a 6.7% reduction was observed between maximum velocities (9.0 m/s). Similarly, for a nozzle diameter of 32 mm, a 6.3% reduction in the Nu was observed between minimum velocities and a 5.3% reduction was observed between maximum velocities. For a nozzle diameter of 40 mm, the Nu decreased by 4.8% at minimum velocities and by 8.7% at maximum velocities. Between h/d = 7 and h/d = 8, with a nozzle diameter of 25 mm, the Nu decreased by 6.3% at minimum velocities and by 5.7% at maximum velocities. For a nozzle diameter of 32 mm, a 6.2% reduction was noted at minimum velocities, and a 4.3% reduction was observed at maximum velocities. For a nozzle diameter of 40 mm, the reductions were 2.6% at minimum velocities and 3% at maximum velocities. When the dimensionless distances h/d = 6 and h/d = 8 were compared for a nozzle diameter of 25 mm, the Nu decreased by 15.6% at minimum velocities and by 12% at maximum velocities. For a nozzle diameter of 32 mm, the reductions were 14.2% at minimum velocities and 9.4% at maximum velocities. For a nozzle diameter of 40 mm, the reductions were 7.3% at minimum velocities and 11.5% at maximum velocities. .1.2 Comparison of Experimental Results for Inclined Heat Sink (\(\alpha\) = 20\({}^{\circ}\))  
The Nu for a rectangular finned heat sink with a 20\({}^{\circ}\) inclination increased with the increase in Res. Increases in the nozzle diameter and jet air velocity also led to higher Nus. Conversely, the Nu increased with a decreasing dimensionless h/d distance, and the relationship was predominantly linear. The results illustrating the variation in Nus with Res for dimensionless distances (h/d = 6, 7, 8) are presented in Figures 6-8. Figures 6-8 present the experimental results of Nu-Re variations for a rectangular finned heat sink inclined at 20\({}^{\circ}\) under a constant heat flux of 200 W. The results cover varying ratios of the h/d to nozzle diameter and different nozzle diameters for five flow velocity values. Based on the experimental results, it was determined that the Nu increases with higher Res and larger nozzle diameters. However, the Nu also increases as the dimensionless h/d distance decreases, with a predominantly linear relationship. While the Nu is affected almost uniformly across all jet velocity levels, it is more significantly influenced at moderate speeds (approximately 7 m/s) than at lower speeds.