The influence of air temperature on heat transfer coefficient under forced air-cooling conditions

Employing a combined approach of offline experiments and numerical simulations, this study investigates the temperature distribution of steel rods under various air temperatures during forced air-cooling to elucidate the cooling mechanisms of steel rods. At a wind speed of 22 m/s, an increase in air temperature significantly reduces the convective heat transfer coefficient. Continuous airflow creates regions of low Reynolds numbers at the top of the rod and high Reynolds numbers along its sides, significantly enhancing the side convective heat transfer coefficient over the top. Empirical formulas for heat transfer coefficients at different rod positions were derived from experimental and simulation results and validated experimentally with a calculation error of less than 4 %.