Ricerc@Sapienza

We use DNS to analyze the cooling of a heated curved surface due to a cold subsonic impinging jet. The configuration resembles several industrial applications such as impingement cooling in gas turbine blade. The ratio between the distance from the nozzle (H) and the jet diameter (D) is equal to 5. The results in terms of velocity, turbulence and heat transfer are compared with a reference simulation with where a subsonic jet impingesing on a flat surface. The results allowed to assess the influence of the curvature on the velocity and Nusselt number distribution is assessed.

This paper reports on a two-phase flow Direct Numerical Simulation (DNS) aimed at analyzing the resuspension of solid particles from a surface hit by a transonic jet inside a low pressure container. Conditions similar to those occurring in a fusion reactor vacuum vessel during a Loss of Vacuum Accident (LOVA) have been considered. Indeed, a deep understanding of the resuspension phenomenon is essential to make those reactors safe and suitable for a large-scale sustainable energy production. The jet Reynolds and Mach numbers are respectively set to 3300 and 1.