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This study deals numerically with a heat transfer in a turbulent flow over a   shallow cavity. Two different configurations of the incoming flow are   considered: a boundary layer flow and a plane wall jet flow, in order to   examine the wall jet outer layer effect on the heat transfer. This layer is   an important additional turbulence source in the wall jet flow. Reynolds   number and turbulence intensity effects were investigated in the boundary   layer incoming flow case. The cavity depth to nozzle height ratio effect was   examined in the wall jet incoming flow case. The numerical approach is based   on k-ω standard turbulence model. This study reveals that the heat transfer   is very sensitive to the incoming flow characteristics. The turbulence   intensity increase accelerates the reattachment of the shear layer at the   cavity floor and enhances the heat transfer. The reattachment phenomenon   seems to be less affected by the Reynolds number. However, an increase in   this parameter ameliorates the heat transfer. It was also observed a heat   transfer enhancement in the wall jet incoming flow case as compared to that   of a boundary layer. Likewise, it was found that the augmentation of the   cavity depth to the jet nozzle height ratio improves even more the heat   transfer. The maximum heat transfer occurs upstream of the reattachment

Heat transfer prediction in a shallow cavity effect of incoming flow characteristics