Numerical simulation of slot jet impingement heat transfer based on one-equation intermittency transition model

  Objectives  Since the jet impingement phenomena involves the problems of laminar-turbulence transition process, strong adverse pressure gradient and separated fluid, it is difficult to predict the phenomenon by using the traditional turbulence models. Therefore, it makes great sense to studying the robustness of the turbulence models under different conditions.

  Methods  The one-equation transition model based on the laminar-transition theory was applied for the numerical simulation of heat transfer of slot jet impinging flows. The numerical model accurately predicted the heat transfer characteristics measured with the local Nusselt number (Nu), where the cases with the range of nozzle-plate spacing ≤ H/B ≤ 9.2 for steady and pulsating jet impingement heat transfer are studied.

  Results  The numerical results show that for the case of H/B=4, the one-equation transition model accurately captures the value and position of secondary Nusselt number peak affected by the transition; and for the case of H/B=9.2, the one-equation transition model does not have the false secondary peak which occurs in the most of traditional Reynolds-Average Navier-Stokes (RANS) turbulence models and obtains good Nusselt number distribution comparing with the experimental data.

  Conclusions  In general, the one-equation transition model is able to predict the heat transfer for steady and pulsating slot jet impinging flows accurately and has shown a good robust characteristic for large range of nozzle-plate spacing.