## 3 Results
### Variation in Nusselt Number with Re
For  
Figure 8: Comparison of experimental results for inclined heat sink (\(\alpha\) = 20\({}^{\circ}\)) at constant heat flux (200 W) and h/d = 8. Figure 6: Comparison of experimental results for inclined heat sink (\(\alpha\) = 20\({}^{\circ}\)) at constant heat flux (200 W) and h/d = 6. Figure 7: Comparison of experimental results for inclined heat sink (\(\alpha\) = 20\({}^{\circ}\)) at constant heat flux (200 W) and h/d = 7.  
all nozzle diameters and nozzle-to-heat sink distance ratios, the Nu reaches its maximum value at the highest flow velocity (9.0 m/s). The maximum Nu for the rectangular finned heat sink with a 20\({}^{\circ}\) inclination under constant heat flux conditions was calculated at a nozzle diameter of 40 mm, a dimensionless distance of h/d = 6, and a flow velocity of 9 m/s. For the rectangular, finned heat sink with a nozzle diameter of 25 mm and a dimensionless distance of h/d = 6, an increase in flow velocity resulted in a 6.4% to 9.6% increase in the Nu. Additionally, a 35% increase in the Nu was found between minimum (4.0 m/s) and maximum (9.0 m/s) velocities under the same conditions. For a nozzle diameter of 32 mm, increases in flow velocity resulted in a 3.9% to 5.7% rise in the Nu, with a 19.7% increase observed between the minimum and maximum velocities under the same conditions. For a nozzle diameter of 40 mm, the Nu increased by 3% to 5.4% with rising flow velocity and a 17.4% increase was observed between the minimum and maximum velocities under the same conditions. According to the experimental results for the constant heat flux (200 W) and inclined heat sink (\(\alpha\) = 20\({}^{\circ}\)) at h/d = 6, it was observed that the heat transfer became enhanced as the fluid velocity and nozzle diameter increased. Under constant heat flux conditions, for a rectangular, finned heat sink inclined at 20\({}^{\circ}\) with a nozzle diameter of 25 mm and a dimensionless distance of h/d = 7, an increase in Nu values ranging from 7.1% to 9.4% was observed due to successive increments in velocity. Additionally, for the rectangular, finned heat sink under the same conditions, a 36.8% increase in the Nu was recorded between the minimum (4.0 m/s) and maximum (9.0 m/s) velocities. Similarly, with a nozzle diameter of 32 mm and a dimensionless distance of h/d = 7, the Nu increased by 3.5% to 7% as velocity increased incrementally. Under the same conditions, a 25.3% 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 and h/d = 7, the increase in Nu due to successive velocity increments ranged between 1.2% and 4.6%. Moreover, a 12.5% increase was observed in the Nu between the minimum and maximum velocities under the same conditions. The experimental results for a constant heat flow of 200 W and an inclined heat sink at a 20\({}^{\circ}\) angle, with a height-to-diameter ratio of seven, demonstrated that heat transfer is enhanced by increasing fluid velocity and nozzle diameter. For a rectangular finned heat sink inclined at 20\({}^{\circ}\) with a constant heat flux and a nozzle diameter of 25 mm at h/d = 8, the Nu increased by 7.1% to 9.1% due to successive velocity increments. Additionally, a 37.8% increase in the Nu was found between the minimum (4.0 m/s) and maximum (9.0 m/s) velocities. With a nozzle diameter of 32 mm and h/d = 8, the Nu increased by 3.7% to 8.5% due to incremental velocity increases, while a 24.5% increase was observed between the minimum and maximum velocities. For a nozzle diameter of 40 mm at h/d = 8, the Nu increased by 2.6% to 3.8% due to successive velocity increments, and a 13.2% increase was recorded between the minimum and maximum velocities. The experimental results for constant heat flux of 200 W and an inclined heat sink at an angle of 20\({}^{\circ}\) with a height-to-diameter ratio of eight indicated that heat transfer enhanced with an increasing fluid velocity and nozzle diameter.