| In this work, a multiple vibrating piezoelectric cooling fan system is developed. The fan system consists of one piezoelectric fan and six magnetic fans. All the seven fans have a small magnet attached at their tips. Piezoelectric fan vibration is actuated by alternating voltage input while the six magnetic fans use repulsive magnetic force to vibrate.The fans were investigated for frequency, amplitude and power consumption. Additionally, cooling ability of the fan system inside a heat sink was investigated experimentally, with two fans of different shape at the tip; T-Shaped and I-Shaped fans. The effects of the amplitude, frequency, power consumption, convective heat transfer coefficient and the dimensionless convective heat transfer number was analyzed. Furthermore, CFD simulation was done for average steady state temperature for comparison, in addition of air flow field visualization.With I-Section,55mm*20mm*0.2mm fan, total amplitude of the multiple vibrating systems was 64mm at 28.5Hz, while T-Section fan having 30mm width at the tip had a total amplitude of 61mm at 31.2Hz. Amplitude of a single piezoelectric fan was 40mm at 28Hz frequency and 0.6W power consumption.50W heat source was used in the experiment. With the T-Shaped fan operated at 31.2Hz, temperature dropped from 82.59℃ to 67.51℃ while I-Shaped fans had the best case at 28.5Hz with temperature dropping to 71.11℃. CFD simulation for air flow visualization generated 1.25m/s air velocity. |
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