Computation of laminar mixed convection flow in a channel with wing-type built-in obstacles

The object of this investigation is to compute laminar mixed convection flows and heat transfer in a rectangular channel with a delta wing mounted on the bottom wall. The geometrical configuration represents the proposed model of part of a gas-liquid, fin-pipe crossflow heat exchanger (gas side). Enhancement of heat transfer between the gas and the channel wall is evidenced. This augmentation is primarily due to the longitudinal vortices generated by the wing. Mixed convection condition is characterized by buoyancy induced secondary flows which increase the vortex strength and improve the heat transfer still further