Augmented heat transfer in a turbulent channel flow with inclined detached-ribs

This paper presents the results of numerical study of turbulent flow and heat transfer in a channel with inclined detached-ribs. The computations based on the finite volume method, and the SIMPLE algorithm have been implemented. The study encompasses the Reynolds number (based on the hydraulic diameter of a channel) range from 4000 to 24,000. The heat transfer, pressure loss and thermal performance of the inclined detached-ribs with different attack angles (θ) of 0°, 15°, 30°, 45°, 60°, 75°, 105°, 120°, 135°, 150° and 165° are examined and compared with those of the typical transverse attached rib with θ of 90o. The computational results reveal that, at high Reynolds number, the inclined ribs with θ=60o and 120o yield comparable heat transfer rates and thermal performance factors which are higher than those given by the ones with other angles. On the other hand, at low Reynolds number, the effect of rib attack angle is insignificant.