Numerical Study of Jet Impingement Cooling on a Smooth on 3-D Convex Surface

Abstract

Jet impingement cooling is an alternative method to force a fluid flowing to a target surface in order to remove heat from it. Many applications are implementing this system such as electronic device coolers and cooler for turbine blades. The significance of this application is it can increase the rate of heat transfer towards the fluid. A set of simulations was run in ANSYS Fluent on 2D axis-symmetry of round nozzle tip with a convex target surface. After validation, it was found that the best viscous model that can be used throughout the simulation was a standard k-epsilon model. Reynold number, nozzle tip to target surface distance, L/d, and target surface radius, r/d are the parameters considered. The ranges of the parameters are 5000 Re100000, 1L/d10and 8.86r/d20. The numerical results were validated against the experimental data. The ACFD method was applied to derive an equation that correlates the average Nusselt number to the parameters. The validity of the equation is tested by comparing the output to that of the numerical results. The normalized root means square error percentage, NRMSE %, is 4.91%.