Convective heat transfer in turbulized flow past a hemispherical cavity

The flow structure and the local heat transfer coefficients on the surface of a hemispherical cavity are investigated. It is found that the position of streamlines along the cavity surface resembles that of the electric dipole containing a «source» and a «sink». The «sink» is an eddy which entrains air from the cavity into the free stream flow. As the level of the free stream turbulence grows, the mean value of the heat transfer coefficient on the cavity surface increases. However, in this case the effective use of the cavity for enhancing heat transfer is reduced