Abstract
This paper describes the effect of axial angle on mixed convection in horizontal square duct with heated and cooled opposite walls by the three-dimensional numerical analysis. The velocity fields and the pressure and temperature distributions obtained by SIMPLE method using dimensionless governing equations. The QUICK scheme was applied to the convection term of momentum and energy equations. The analytical condition was assumed that the axial angle 0 was 37 conditions in -π/2≦0≦π/12. Numerical results show that the three-dimensional flow behavior was influenced by axial angles. In generally, the large recirculation flow, swirl flow, was generated in the duct, and tow recirculation flows appeared inside of large recirculation flow. However, in case of large axial angle, 0>5π/12, Benard-Type flow was generated in the duct. The pressure drop ratio and the heat transfer behavior were discussed corresponding to the flow, and the maximum heat transfer was taken near the 0=π/8.
