Abstract
The present investigation is to find the enhancement of heat transfer in the recirculation region when additional centrifugal forces due to streamline curvature are imposed on to the shear-layer. Backward Faced Step (BFS) have got great importance to study the separated and recirculating flows and their heat and mass transfer effects due to its geometrical simplicity. The effects of the radial pressure gradient existing in case of the curved stream line and how it affects the turbulence are investigated in this present study. The stabilizing and destabilizing effects with heat transfer have been studied in this paper for three different curvatures (flat, concave, and convex). Numerical results obtained by the use of the open source code OpenFOAM-3.0.1 is compared with the experimental results. The three-dimensional analysis has been done using an aspect ratio of 18 (AR=18:1) at Reynolds number based on step height as 80000. The distribution of Nusselt number (Nu), skin friction coefficient (Cf), and coefficient of pressure (Cp) were found on the bottom wall with close heed. The results show that the convex surface stabilizes the flow whereas the concave surface introduce more disturbances and destabilizes the flow.
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