Thermo-fluid-dynamic analysis of innovative synthetic jet devices

Synthetic jets are largely used, especially in the field of electronic cooling; indeed their heat transfer performances have been widely investigated and some of the work performed at University of Naples Federico II is herein described. Heat transfer coefficients have been enhanced through the design of innovative synthetic jet devices; in particular, twin synthetic jets and multi orifice nozzles are considered. Obviously, the heat transfer performances of both the classic and innovative devices are strictly related to their impinging flow field on the surface to be cooled. In this work, the behaviour of innovative impinging synthetic jets is experimentally investigated by using Particle Image Velocimetry (PIV) and IR thermography leading to both time average and phase average flow velocity and heat transfer measurements. Three-dimensional coherent vortex structures, time-averaged and phase-averaged means, as well as turbulent statistics of flow fields and wall heat transfer data are presented and discussed.