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This paper is an investigation of the heat transfer augmentation in the fully-developed portion of a 2:1 aspect ratio channel with orthogonal ribs at Reynolds numbers based on the open channel hydraulic diameter of 20,000, 30,000, and 40,000. Ribs are applied to the two opposite wide walls. The rib aspect ratio is varied systematically from 1, 3, and 5, with a constant rib height and constant rib pitch (rib pitch-to-height ratio of 10). The purpose of the study is to extend the knowledge of the performance of rectangular channels with ribs to include high aspect ratio ribs. Data reported includes the local Nusselt number augmentation as well as the friction factor augmentation. With increasing rib width, the overall heat transfer augmentation decreased accompanied by a reduction in pressure drop.

Effect of Rib Aspect Ratio on Heat Transfer and Friction in Rectangular Channels