The “ Analyzing Laminar and Turbulent Flow Performance in Finned Heat Transfer Systems” is a study or research project that focuses on assessing the effectiveness and efficiency of heat transfer systems equipped with finned surfaces. Optimizing thermal management in passive cooling pin fin devices is the focus of this research. The Reynolds number is a key parameter in its study of heat transfer efficiency and flow dynamics, distinguishing laminar and turbulent flows. The Shear Stress Transport (SST) k-omega model is used to simulate laminar and turbulent flows in finer heat transfer systems. Comparing the two flow regimes, it measures velocity, temperature, pressure, Reynolds number, and skin friction coefficient. The author wants to find the best fin design for heat transmission. Both flow types visually display streamlined patterns. The cooled heat transfer system is laminar, and turbulent flow is covered in ”Results and Discussion”. In laminar flow, velocities ranged from 0 to 0.129 m/s, static temperature varied from 305 to 320 K, static pressure ranged from -0.02 to 0.064 Pa, Reynolds number ranged from 128 to 243, and skin friction coefficient varied from 0.0048 to 0.01. In turbulent flow, velocities ranged from 0 to 0.235 m/s, static temperature varied from 300 to 320 K, static pressure ranged from -0.02 to 0.064 Pa, Reynolds number ranged from 2658 to 3736, and skin friction coefficient varied from 0.00487 to 0.012. Streamline patterns were also illustrated for both flows.