EFFECTS OF V-SHAPED RIB ARRAYS ON TURBULENT HEAT-TRANSFER AND FRICTION OF FULLY-DEVELOPED FLOW IN A SQUARE CHANNEL Academic Article

This study examines turbulent heat transfer and friction characteristics of fully developed flow of air in a square channel in which two opposite walls are roughened with aligned arrays of V-shaped ribs. The rib-roughened channel models the internal cooling passages in modern gas turbine airfoils. The anglesof-attack of the V-shaped rib arrays are 45, 60, 90 (same as 90 full ribs), 120, and 135. The 60 V-shaped ribs with p e = 10 have the highest ribbed wall heat transfer and smooth wall heat transfer for a given air flow rate, and the highest channel heat transfer per unit pumping power. They are recommended for internal turbine airfoil cooling, replacing 45 or 60 full ribs. 1991.

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