CFD Study on Convective Heat Exchange between Impinging Gas Jets and Solid Surfaces

The paper is concerned with a CFD numerical investigation using the Fluent code of the convective heat exchange between an impinging gas jet at room temperature and a structured solid surface with square-shaped grooves which is maintained at constant temperature of 80 °C. Reynolds averaged Navier-Stokes simulations coupled with the energy equation are performed for a planar jet on a 3D domain with periodic boundary conditions.The range of jet Reynolds numbers used for the simulations is in the interval from 2000 to 10000, while the jet standoff distance can take different values, ranging from 2 to 10 times the jet width b=2 mm. The detailed distribution of the convective heat transfer coefficient and the mean Nusselt number at the impingement of the air jet on the impacted plate will be inferred. Finally, a comparison between the numerical results, a set of experiments performed and relevant cases from literature is made and conclusions are drawn. One main result of the study is the confirmation of the numerical procedure for the domain used.