Experimental Study on Thermal Performance of Longitudinally-Finned Heat Sink Integrating Piezoelectric Fan

An experimental investigation is performed to research the heat transfer performance (HTP) of a longitudinally-finned heat sink integrating piezoelectric fan. This piezoelectric fan (PF) is actuated at its first-mode resonant frequency of 51Hz and excitation voltage of 220V. The influence of PF orientation on the thermal resistance of finned heat sink is revealed under different channel flow velocity ranging from 0m/s to 8m/s. The results show that the presence of the PF has a positive effect on HTP enhancement of finned heat sink, which is tightly dependent on the channel flow velocity, PF orientation. In general, the role of PF on improving the HTP of finned heat sink behaves in the situations of low channel flow velocity, especially under free convection situation. When the PF is located tightly close to the front edge of heat sink, its orientation appears to be an important factor affecting the HTP of finned heat sink.