Numerical Study of Fluid Flow and Heat Transfer over a Circular Tubes Bank of Heat Exchanger with Different Shapes of Vortex Generator

A numerical study is carried out to study the heat transfer and flow in the plate-fin and tube heat exchangers with three different shaped vortex generators mounted behind the tubes with Reynolds number ranging (7000 Re 11000). A computational fluid dynamics code (FLUENT) is used to solve steady (2-D) Navier- Stokes and energy equations. (k-) model used to remedy the turbulent effects. The effects of three shapes of winglets is looked at (airfoil, rectangle and triangle) with different angles of attack (30 and 45) has been investigated on average heat transfer (Nu), friction coefficient and pressure drop. The results show that there is an effect for using winglet pairs on heat transfer, friction coefficient and pressure drop, also, heat transfer depends on the shape, angle of attack of winglet. The triangle is the best shape for enhancing heat transfer and ( = 45) is the best angle of attack for enhancing heat transfer.