DNS of turbulent heat transfer through two-dimensional slits

摘要

Direct Numerical Simulation (DNS) of a turbulent heat transfer in a channel flow with two-dimensional slit has been performed in order to investigate the performance of the heat transfer behind a slit and the effects of the flow contraction on the thermal field. In the wake region, the mean flow becomes asymmetric in the wall-normal direction by the Coanda effect. These asymmetry phenomena affect the heat transfer performance. The several differences are found between the turbulent statistics in this study and those of a backward facing step. This can be attributed to the typical flow through the slit.