HEAT-TRANSFER IN A CHANNEL WITH BUILT-IN WING-TYPE VORTEX GENERATORS

An extension of earlier work is made in the present paper to determine numerically the structure of flow and heat transfer characteristics in a rectangular channel with a built-in delta wing protruding from the bottom wall. The predictions are made through the numerical solution of complete Navier-Stokes and energy equations. Augmentation of heat transfer between the flowing fluid and channel wall is seen. The effect of a punched hole, beneath the wing-type vortex generator, on the heat transfer and skin friction characteristics has been determined. The influence of the vortex generator's angle of attack and Reynolds number on heat transfer and skin friction is determined. The combined spanwise average Nusselt number showed increases as large as 34% even at the exit of a long channel at an angle of attack of 26-degrees.