TY - JOUR
TI - Heat transfer prediction in a shallow cavity effect of incoming flow characteristics
AU - Arous Fatima Madi
JN - Thermal Science
PY - 2016
VL - 20
IS - 5
SP - 1519
EP - 1532
PT - Article
AB - 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.