Heat transfer characteristic of an impingement cooling system with different nozzle geometry

The influence of different geometries of the nozzles of an impingement cooling array of six jets directed to the flat surface on the flow mechanism and the heat transfer were investigated numerically. Basically the setup consisted of a cylindrical plenum with an inline array of impingement jets. Simulation were performed using Computational Fluid Dynamics (CFD) code Ansys CFX. The k - omega shear stress transport (SST) turbulence model was used in calculations. The physical model was simplified by using the steady state three-dimensional analysis and incompressible and viscous flow of the fluid. The study focused on an usage of different nozzles shapes in the cooling system for constant inlet flow parameters and boundary conditions. The numerical analysis of the different mesh density resulted in good convergence of the GCI index, what excluded mesh size dependency. The obtained results indicate, that the usage of various types of nozzles results in different values of the heat transfer coefficient and the Nusselt number in the affected area.