CFD Prediction of Slot Jet Impingement Heat Transfer

This work numerically investigates the heat transfer characteristics of a wide-slot jet impinging orthogonally on an isothermal hot plate. The case study consists of an incompressible turbulent jet flow with a Reynolds number of 11000. Two-dimensional Reynolds-averaged Navier–Stokes (RANS) simulations are performed utilizing three different turbulence closures, namely, realizable k-, k- SST, and the recently developed generalized k- (GEKO) models. Diagnostics include air flow characteristics, as well as surface pressure and local Nusselt number distributions. The influence of using production limiters to mitigate the excessive generation of turbulent kinetic energy in the stagnation region is addressed by means of detailed comparisons against reference experimental findings. The various models capture the pressure distribution on the plate with good accuracy. As far as classical approaches are concerned, the realizable k- model significantly overestimates heat transfer due to excessive turbulent diffusion, whereas the k- SST model provides much better agreement with experiments. Moreover, the default GEKO parameters are found to inadequately represent the flow physics of the slot jet configuration. To address this limitation, two alternative sets of model coefficients are proposed, which provide better results.