Heat transfer predictions with a cubic k– ε model for axisymmetric turbulent jets impinging onto a flat plate

Abstract

Local heat transfer in turbulent axisymmetric jets, impinging onto a flat plate, is predicted with a cubic k– ε model. Both the constitutive law for the Reynolds stresses and the transport equation for the dissipation rate ε contribute to improved heat transfer predictions. The stagnation point value and the shape of the profiles of the Nusselt number are well predicted for different distances between the nozzle and the flat plate. Accurate flow field predictions, obtained with the presented turbulence model, are the basis for the quality of the heat transfer results. The influence of the nozzle–plate distance on the stagnation point Nusselt number, is also correctly captured. For a fixed nozzle–plate distance, the influence of the Reynolds number on the stagnation point heat transfer is correctly reproduced. Comparisons are made to experimental data and to results from a low-Reynolds standard k– ε model [1] and the v 2– f model [2].