Characterization and optimization of the thermal performance of miniature piezoelectric fans
T. Acikalin, S. V. Garimella, A. Raman and J. Petroski, “Characterization and Optimization of the Thermal Performance of Miniature Piezoelectric Fans,” International Journal of Heat and Fluid Flow Vol. 28(4), pp. 806-820, 2007.
Piezoelectric fans have emerged as a viable cooling technology for the thermal management of electronic devices, owing to their low- power consumption, minimal noise emission, and small and conﬁgurable dimensions. Piezoelectric fans are investigated for application in the cooling of low-power electronics. Diﬀerent experimental conﬁgurations are considered, and the eﬀect of varying the fan amplitude, the distance between the fan and the heat source, the fan length, its frequency oﬀset from resonance, and the fan oﬀset from the center of the heat source are studied to assess the cooling potential of the fans. A design of experiments (DOE) analysis revealed the fan frequency oﬀset from resonance and the fan amplitude as the critical parameters. Transfer functions are obtained from the DOE analysis for the implementation of these fans in electronics cooling. For the best case, an enhancement in convective heat transfer coeﬃcient exceeding 375% relative to natural convection was observed, resulting in a temperature drop at the heat source of more than 36.4 °C. A computational model for the ﬂow ﬁeld and heat transfer induced by the piezoelectric fan is also developed. Eﬀects of the ﬂow on convection heat transfer for different fan-to-heat source distances and boundary conditions are analyzed. Transition between distinct convection patterns is observed with changes in the parameters. The computational results are validated against experimental measurements, with good agreement.
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