## 3 Results
### Variation in Nusselt Number with Re
At a heat flux of 200 W, the Nus for varying nozzle-to-heat-sink dimensionless distances and the same nozzle diameter were compared for minimum and maximum flow velocities. Between the dimensionless distances of h/d = 6 and h/d = 7, for a nozzle diameter of 25 mm, a 10.5% decrease in the Nu was found for the minimum velocity (4.0 m/s), and a 9.4% decrease was found for the maximum velocity (9.0 m/s). For a nozzle diameter of 32 mm, decreases of 8.6% and 4.3% were found for minimum and maximum velocities, respectively, under the same dimensionless distance comparison. For a nozzle diameter of 40 mm, the Nu decreased by 2.4% for the minimum velocity and by 6.5% for the maximum velocity between h/d = 6 and h/d = 7. For the dimensionless distances of h/d = 7 and h/d = 8, with a nozzle diameter of 25 mm, the Nu decreased by 6.4% and 5.7% for the minimum and maximum velocities, respectively. For a nozzle diameter of 32 mm, decreases of 6.4% and 7% were observed for the minimum and maximum velocities, respectively. With a nozzle diameter of 40 mm, the Nu decreased by 3.5% for the minimum velocity and by 2.9% for the maximum velocity. Between h/d = 6 and h/d = 8, for a nozzle diameter of 25 mm, the Nu decreased by 16.3% for the minimum velocity and by 14.5% for the maximum velocity. For a nozzle diameter of 32 mm, decreases of 14.5% and 11% were observed for the minimum and maximum velocities, respectively. For a nozzle diameter of 40 mm, the Nu decreased by 5.9% for the minimum velocity and by 9.2% for the maximum velocity. .1.3 Comparison of Experimental Results for Inclined Heat Sink (\(\alpha\) = 30\({}^{\circ}\))  
The Nu for the rectangular finned heat sink inclined at 30\({}^{\circ}\) increased with the Re. An increase in nozzle diameter and jet air velocity led to a rise in the Nu. Conversely, the Nu increased with a decreasing dimensionless h/d distance, and the relationship was predominantly linear. The variation in the Nu with the Re for different dimensionless distances (h/d = 6, 7, and 8) is presented in Figures 9-11. The experimental results of Nu-Re variations for five different velocity values under the influence of different nozzle-to-receiver, distance-to-nozzle diameter ratios, and nozzle diameters for a rectangular-finned, 30\({}^{\circ}\) inclined heat receiver with a constant heat flux of 200 W are presented in Figures 9-11. The experimental findings indicate that the Nu increases with higher Res and larger nozzle diameters. Conversely, the Nu also increased  
Figure 10: Comparison of experimental results for inclined heat sink (\(\alpha\) = 30\({}^{\circ}\)) at constant heat flux (200 W) and h/d = 7. Figure 9: Comparison of experimental results for inclined heat sink (\(\alpha\) = 30\({}^{\circ}\)) at constant heat flux (200 W) and h/d = 6.  
with the decreasing dimensionless h/d distance, and the relationship was predominantly linear. The Nu was nearly uniformly affected across all jet velocities but showed a more significant impact at approximately 7 m/s compared to lower velocities. For all nozzle diameters and nozzle-to-receiver, distance-to-diameter ratios, the Nu reached its maximum value at the highest flow velocity of 9.0 m/s. At constant heat flux, the highest Nu for the rectangular-finned, 30\({}^{\circ}\) inclined heat receiver was calculated for a nozzle diameter of 40 mm, an h/d distance of six, and a flow velocity of 9 m/s. For a rectangular-finned, 30\({}^{\circ}\) inclined heat receiver with constant heat flux, a nozzle diameter of 25 mm, and an h/d distance of six, the Nu increased between 5.6% and 10.2% with successive velocity increments. Additionally, under the same conditions, a 37.4% increase in the Nu was found between the minimum (4.0 m/s) and maximum (9.0 m/s) velocities. For a nozzle diameter of 32 mm and an h/d distance of six, the Nu increased between 3.6% and 5.7% with successive velocity increments, while a 20.2% increase was observed between the minimum and maximum velocities.