Abstract
. Friction factors for fully developed flow in an equilateral triangular duct containing built-in vortex generators of delta wing, rectangular wing, pair of delta winglets, and pair of rectangular winglets have been investigated experimentally for Reynolds numbers ranging from (24 500) to (75 750). The ratio of the cross- sectional area of the test duct to that of the vortex generator (AD/AVG) was remaining constant during experiments. The variable parameters were; type of vortex generator, vortex generator angle of attack, and Reynolds number. The friction factor values for the smooth triangular duct are in good agreement with the existing data. The present results show that the friction factor is affected strongly by the wing greater than the winglet pair of vortex generators. The delta wing causes flow loss greater than the rectangular wing, while the flow loss accompany with the existence of the pair of delta- winglets is less than that of the pair of rectangular winglet. It is also observed that the friction factor is affected remarkably by the angle of attack of vortex generator.
