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In a stationary duct, ribs placed at an angle oblique to the main flow direction are more effective in heat transfer enhancementthan the ribs placed perpendicular to the flow. Obliquely placed ribs, besides tripping the boundary layer, produce secondaryflow patterns to increase heat transfer from the surfaces. Ducts rotating about an axis perpendicular to their own also developsecondary flows. These two secondary flows, produced by oblique ribs and rotation, interact with each other and developa new heat transfer pattern that is different from those produced by oblique ribs or by rotation alone. This paper uses twotypes of rib configurations (60∘ parallel ribs and 60∘ staggered ribs) as turbulence and secondary flow promoters. The localand surface averaged Nusslt numbers are presented for both stationary and rotating conditions. This experimental study isconducted on a two-pass square channel with two opposite rib roughened surfaces (leading and trailing sides). All the wallsare maintained at the same temperature. The heat transfer results in a rotating condition show that the 60∘ staggered ribs aremore effective in the first pass but the 60∘ parallel ribs do better in the second pass

Influence of Rotation on Heat Transfer from a Two-Pass Channel with Periodically Placed Turbulence and Secondary Flow Promoters