## 3 Results
### Variation in Nusselt Number with Re
For a nozzle diameter of 40 mm and an h/d distance of six, the Nu increased between 1.7% and 4% with successive velocity increments, and an 11.2% increase was observed between the minimum and maximum velocities. According to the experimental results for the constant heat flux (200 W) and inclined heat sink (\(\alpha\) = 30\({}^{\circ}\)) at h/d = 6, it was observed that the heat transfer enhanced as the fluid velocity and nozzle diameter increased. 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 seven, the Nu increased between 7.9% and 10.8% with successive velocity increments. Under the same conditions, a 44% 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 seven, the Nu increased between 4.5% and 5.8% with successive velocity increments, and a 22.1% increase was observed between the minimum and maximum velocities. For a nozzle diameter of 40 mm and an h/d distance of seven, the Nu increased between 1.1% and 3.9% with successive velocity increments, while an 11.4% increase was observed 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 30\({}^{\circ}\) with a height-to-diameter ratio of seven enhanced that heat transfer with increasing fluid velocity and nozzle diameter. Under constant heat flux conditions, for a rectangular, finned heat sink with a 30\({}^{\circ}\) inclination and a nozzle diameter of 25 mm at an h/d ratio of eight, an increase in the Nu ranging from 7.5% to 12.4% was observed with successive increments in velocity values. Additionally, for the same heat sink under identical conditions, the Nu exhibited a 49.9% increase between the minimum velocity (4.0 m/s) and the maximum velocity (9.0 m/s). Figure 11: Comparison of experimental results for inclined heat sink (\(\alpha\) = 30\({}^{\circ}\)) at constant heat flux (200 W) and h/d = 8. For a nozzle diameter of 32 mm under constant heat flux conditions and the same h/d ratio of eight, the Nu increased by 3.7% to 6.3% with successive increments in velocity. Furthermore, under identical conditions, a 20.5% 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 40 mm, under constant heat flux conditions and an h/d ratio of eight, the Nu increased by 1.0% to 3.2% with successive velocity increments. Additionally, for the same heat sink and conditions, an 8.6% increase in the Nu was noted between the minimum (4.0 m/s) and maximum (9.0 m/s) velocities. The experimental results for a constant heat flux of 200 W and an inclined heat sink at an angle of 30\({}^{\circ}\) with a height-to-diameter ratio of eight indicated that heat transfer enhanced with the increasing fluid velocity and nozzle diameter. At a heat flux of 200 W, the Nus corresponding to maximum and minimum flow velocities were compared for the same heat sink with varying nozzle-to-heat sink distances normalized by the nozzle diameter. Between the h/d ratios of six and seven for a 25 mm nozzle diameter, a 12.8% decrease in the Nu was observed at minimum velocity (4.0 m/s), while a decrease of 8.6% was recorded at maximum velocity (9.0 m/s). For a 32 mm nozzle diameter between the same h/d ratios, the Nu decreased by 4.5% at a minimum velocity and by 3.0% at a maximum velocity. Similarly, for a 40 mm nozzle diameter, the Nu exhibited a 3.6% decrease at minimum velocity and a 3.4% decrease at maximum velocity. Between the h/d ratios of seven and eight for a 25 mm nozzle diameter, the Nu showed a decrease of 7.2% at minimum velocity and 3.4% at maximum velocity. For a 32 mm nozzle diameter, the decrease in the Nu was 4.0% at minimum velocity and 5.3% at maximum velocity. For a 40 mm nozzle diameter, decreases of 3.0% and 5.4% were observed at minimum and maximum velocities, respectively.