Numerical simulation of the heat transfer from a heated plate with surface variations to an impinging jet

The study of heat transfer between impinging jets and non-uniform heated plates is presented here to analyse if surface variations along the plates, (i.e. dimples, bumps, and bumps&dimples, as we study here), can improve the heat transfer phenomenon. To that end, numerical simulations of the impingement of two different types of axisymmetric turbulent jets on a non-flat plate, located at a known distance H from the jet exit, have been conducted. The cylindrical jet used, of diameter D, is created by a swirl generator nozzle that, depending on its configuration, can produce jets with high or low swirl intensity levels. Different values of non-dimensional nozzle-to-plate distance, H/D, have been studied, as well as different values of the Reynolds number, Re. To know whether or not surface variations along the plate improve the heat transfer between the impinging jet and the plate, our results are compared with those obtained when a flat plate is used.