Abstract
Two-dimensional jet impingement heat transfer enhanced by a square rib has been studied by direct numerical simulation (DNS) to compare predicted Nusselt number with that given by naphthalene sublimation method. In addition to Prandtl number (Pr) of 0.71 for air, Pr of 2.29 equivalent to the Schmidt number in the mass transfer experiment was selected for comparison. The DNSs with different Pr numbers give the local value of the exponent, which is assumed uniform in the conversion of mass transfer coefficient to heat transfer coefficient in the experiments. As a result, it is clarified that the local discrepancy of Nusselt number between the former experiments and simulations has come from the assumption of uniform exponent in the mass transfer experiment.
