The effect of placing vortex generators above ribs in ribbed ducts on the flow, flow temperature, and heat transfer behavior

Placement of vortex generators directly above the first and fifth ribs in a ribbed duct air flow affects the flow and heat transfer behavior. Flow temperature measurements and laser-Doppler flow measurements at the smallest spacing show that the generator-rib pairs behave as a single unit with an increased effective height. At the larger spacing, the flow expands in the cross-stream direction.