Numerical Study of Heat Transfer Characteristics of Turbulent Iso-Thermal Jet Impinging On a Flat Surface

In this paper four turbulent models and two methods to account for the wall effect on the flow and heat transfer are tested for their predictive capabilities in impinging flows. The models are the k – ε STD, k – ε RNG, k – ω SST and v2f model with integration to the wall. First a description of the models is given and some results for a generic test case are presented to highlight some of the characteristics of the different models. Next from these models selected the best one which gives the requirement are used to calculate the flow and heat transfer of a single impinging jet. Originally, most turbulent models were developed for attached flows along flat or mildly curved walls. The impinging jet flow has a different characteristic, i.e. a flow that changes direction from a wall-normal one to a wall-parallel one. Therefore the single impinging jet provides a different and challenging test case for the performance of turbulence models. The results indicate good prediction of the flow by second moment closure models. The best results for heat transfer are obtained with the models using integration to the wall. Numerical results are compared with experimental data, for the heat transfer. The results show the good prediction of the Blending Model for the flow and heat transfer.