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Energies 2016, 9(8), 610; doi:10.3390/en9080610

A Study of an Effective Heat-Dissipating Piezoelectric Fan for High Heat Density Devices

1
Department of Mechanical Engineering, Far East University, Tainan 74448, Taiwan
2
Department of Mechanical Engineering, National Cheng-Kung University, Tainan 70101, Taiwan
3
Department of Mechanical Engineering, Air Force Institute of Technology, Kaohsiung 82047, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Hua Li
Received: 23 March 2016 / Revised: 25 July 2016 / Accepted: 27 July 2016 / Published: 3 August 2016
View Full-Text   |   Download PDF [6136 KB, uploaded 3 August 2016]   |  

Abstract

Heat dissipation per unit volume has grown rapidly, as the size of modern electronic devices has continued to decrease. The air flow induced by an oscillating cantilever blade enhances the heat transfer performance of high heat density devices. The heat transfer improvement mainly depends on the velocity magnitude and distribution of air streams induced by the vibrating blade. Accordingly, this study numerically and experimentally examines the time-varying flow characteristics of a vibrating cantilever for five blade types. The blades are rectangular or trapezoidal with various widths and actuated at various frequencies. The fluid domain is numerically discretized using a dynamic meshing scheme to model the three-dimensional time-varying vibrating blade. The experiment utilizes nine hot-wire velocity meters to measure the average velocities. The flow structure with streamlines and velocity contours of the induced air flow are determined at various section planes. The results show that a major maximum-velocity region appears around the blade tip and that four minor local-maximum-velocity regions appear at the four corners. In addition, the width and width ratio of the blade significantly affects the velocity distribution of the flow induced by the vibrating cantilever blade. View Full-Text
Keywords: vibrating cantilever; piezoelectric fan; transient numerical simulation; computational fluid dynamics (CFD); energy saving vibrating cantilever; piezoelectric fan; transient numerical simulation; computational fluid dynamics (CFD); energy saving
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MDPI and ACS Style

Lin, C.-N.; Jang, J.-Y.; Leu, J.-S. A Study of an Effective Heat-Dissipating Piezoelectric Fan for High Heat Density Devices. Energies 2016, 9, 610.

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