THE CHARACTERISTICS OF COOLING ON HEAT SINK USING A CROSS FLOW SYNTHETIC JET ACTUATED BY VARIATION OF WAVE FUNCTION

摘要

Synthetic jet which is based on zero netto mass input but non-zero momentum is a new approach utilized for cooling system. The synthetic air jet was generated by vibrating membranes which pushed out the air from the cavity through the exit nozzles with oscillatory motion. This research investigated the forced cooling characterization of a cross flow synthetic jet using double membrane actuator with two different variations of sinusoidal and square wave and was conducted in computational as well as experimental stage. Computational stage was conducted by a commercial CFD software of Fluent with a turbulence model k-ω SST with meshing elements quad type pave, while in the experimental work the function generators was used to drive the membranes with the variation of sinusoidal and square wave in three oscillation frequencies i.e 80 Hz, 120 Hz, and 160 Hz at fixed amplitude of 0.002 m/s. The experimental results show significant effect of the reduction of the confinement effect phenomena by using the cross flow synthetic jet. The best heat transfer rate, hence the optimum cooling effect was obtained at a lower oscillation frequency; in this study at sinusoidal 120 Hz - sinusoidal 120 Hz.