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

Chien-Nan Lin, Jiin-Yuh Jang and Jin-Sheng Leu
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Chien-Nan Lin: Department of Mechanical Engineering, Far East University, Tainan 74448, Taiwan
Jiin-Yuh Jang: Department of Mechanical Engineering, National Cheng-Kung University, Tainan 70101, Taiwan
Jin-Sheng Leu: Department of Mechanical Engineering, Air Force Institute of Technology, Kaohsiung 82047, Taiwan

Energies, 2016, vol. 9, issue 8, 1-16

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.

Keywords: vibrating cantilever; piezoelectric fan; transient numerical simulation; computational fluid dynamics (CFD); energy saving (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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