Synthetic Jet Cooling Diaphragm Equation of Motion Characteristic and Verification for Computational Fluid Dynamic Modelling

The miniaturization of electronic devices with high processing components is promoting the rapid increase in heat generation of devices/systems. Synthetic jet cooling flexible thin device has major advantages in order to suit the device miniaturization and compactness. Diaphragm motion is the main component in the device that generate fluid motion for cooling application. In this paper, the synthetic jet diaphragm has been characterized using Laser Doppler to record the motion to determine the motion type. Based on the recorded motion, a User Define Function coding has been develop to imitate the motion in Computational Fluid Dynamic (CFD) software in order to simulate the fluid motion based from the actual diaphragm motion. The diaphragm motion showed a dome shape motion as the laser tracking result were plotted at three points across the diaphragm diameter. Results show that the diaphragm has sinusoidal motion which produce maximum amplitude at 500Hz driving frequency. The UDF program for diaphragm motion has been able to mimic the experimental result.