Numerical investigation of non-newtonian fluids flow in two direction double step square expansion

A numerical investigation to study the behavior of the turbulent non-newtonian flow through a channel with two expansions in two directions under constant heat flux at the lower wall is presented. This study covered Reynolds numbers range of 4000 to 100000 and a power law index from 0.4 to 1.6. The expansion ratio is varied from 1.5 to 3 and aspect ratio from 1 to 4. The full Navier Stocks equations and the k-ε turbulence model besides to the energy equation are used to model the problem. These results are obtained by using ANSYS FLUENT 15.0. The results illustrate that the effect of the first expansion on the second expansion via representation the variation of the reattachment length and Nusselt number. These results gave an idea about the effect of the corner in the two-direction expansion and the whole flow structure.