Abstract
Local and average Nusselt number and overall pressure drop results were obtained experimentally for an air flow ( Re ≈ 3450) in a ribbed duct with vortex generators (circular rods) placed immediately above or just downstream of select rib elements. The larger diameter generators ( d h = 1.0 ) for the two dimensionless rib pitches studied ( P h = 38.4 and 19.2 ) resulted in average Nusselt number, Nu , increases as large as 21 and 12%, respectively, and entropy generation per unit heated length, S', decreases as large as 27 and 9%, respectively. The smaller diameter generators ( d h = 0.50 ) generally had no effect on either Nu or S'.
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