This paper proposes a numerical analysis to evaluate the influence of baffle distance on turbulent airflow characteristics and heat transfer in a rectangular cross-section channel equipped with 8 baffles, by varying d/H ratios. The study covers a turbulent regime with Reynolds numbers between 8000 and 30,000. Our calculations focused on velocity and temperature contours, Nusselt number, friction factor and thermal enhancement factor. The results indicate an increase in the Nusselt number with increasing Reynolds number, while the friction factor decreases. Recycling zones are characterized by low velocity and high temperatures. Reducing the distance between baffles offers potential advantages in terms of accelerating airflow and improving heat transfer, although this is accompanied by an increase in the coefficient of friction. Thus, careful selection of this distance is essential to effectively balance improved heat transfer with minimized energy losses. What's more, the case where d/H = 0.452 offers the best performance for optimizing heat transfer in the channel studied.