The enhanced heat transfer characteristics of inclined perforated rib in a large aspect ratio rectangular passage were studied through numerical simulations. The holes inclination angle and entrance flow Reynolds number were adjusted in the range of 0°-30° and 3×104-9×104 respectively. The variation laws of channel friction factor and its rib-wall Nusselt number with these parameters were system analyzed. The calculation results reveal that the inclined perforated rib has a lower friction factor and an improved local heat transfer immediately downstream from the perforated rib due to the impingement of jet-like flows as compared with the solid rib. With the increasing of holes inclination angle

the relative friction factor is elevated monotonously

and the averaged Nusselt number ratio take on up-down tendency

therefore an optimal holes inclination angle is 15°

when the thermal performance factor reached its maximum. The friction factor slightly decreases and the averaged Nusselt number gradually increases with the increasing of Reynolds number for the inclined perforated rib.