밀폐공간 내에서 압전세라믹 냉각홴의 열성능에 대한 실험적 연구

This study deals with fluid flow and heat transfer around a module cooled by forced air flow generated by a piezoelectric(PZT) fan in an enclosure. The fluid flows were generated by a flexible PZT fan which deflects inside a fluid transport system of comparatively simple structure mounted on a PCB in an enclosure(270×260×90㎣). Input voltages of 30V and 40V, and a resonance frequency of 28㎐ were used to vibrate the cooling fan. Input power to the module was 4W. The height in an enclosure was changed 23~43㎜. The fluid flow around the module was visualized by using PIV system. The temperature distributions around a heated module were visualized by using liquid crystal film. As the height in an enclosure and the input voltage of PZT fan increased, the cooling effect of module using a PZT fan increased. We found that the flow type was T- or Y-shape and the cooling effect was increased by the wake generated by a PZT fan.