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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimir: 1065-3090
ISSN On-line: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.2018028199
pages 57-78

THERMAL AND FLUID CHARACTERISTICS OF SINGLE FIN HEAT SINK WITH A PIEZOELECTRIC COOLING FAN

Heng-Pin Hsu
Department of Mold and Die Engineering, National Kaohsiung University of Science and Technology, 1 University Rd., Yanchao District, Kaohsiung City 824, Taiwan (R.O.C.); Air Force Institute of Technology, Kaohsiung 820, Taiwan
Chao Cheng
Department of Mold and Die Engineering, National Kaohsiung University of Science and Technology, 1 University Rd., Yanchao District, Kaohsiung City 824, Taiwan (R.O.C.)
Hung-Yi Li
Department of Mold and Die Engineering, National Kaohsiung University of Science and Technology, 1 University Rd., Yanchao District, Kaohsiung City 824, Taiwan (R.O.C.)
Tsung-Sheng Sheu
Department of Mechanical Engineering, R.O.C. Military Academy, Zhongli District, Taoyuan City, Taiwan
Herchang Ay
Department of Mold and Die Engineering, National Kaohsiung University of Science and Technology, 1 University Rd., Yanchao District, Kaohsiung City 824, Taiwan (R.O.C.); St. John's University, No. 499, Sec. 4, Tam King Road, Tamsui District, New Taipei City, 25135 Taiwan, R.O.C.

RESUMO

This paper presents a comparative investigation of numerical flow simulations and the experimental data of a piezoelectric fan by particle image velocimetry. It investigates the fluid mechanics of a piezoelectric fan operating in its vibration frequency mode. The experimental results show that the optimal driving frequency for the piezoelectric fan is 60 Hz. At this frequency, the thin blade of the piezoelectric fan reaches its maximum vibration amplitude. The flow field visualization obtained in the experiments shows that the amplitude of the fan blade directly affects flow velocity. The vortex structures exhibit irregular motion once they separate from the blade tip. The phase measured PIV results are presented in terms of vorticity and show the formation of a horse shoe vortex. A maximum flow velocity of 1.7 m/s is obtained. It was also observed that the vibrating blade induces a pair of vortices, one clockwise and one counterclockwise. The blade vibration induces a pair of vortices around the blade tip. The blade inhale and propulsion air flow induces a jet-like motion at the tip during a cycle. Its fast blade motion achieves thermal cooling.


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